{"id":22815,"date":"2022-06-04T09:00:29","date_gmt":"2022-06-04T03:30:29","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=22815"},"modified":"2023-01-25T11:05:35","modified_gmt":"2023-01-25T05:35:35","slug":"selina-concise-chemistry-class-6-icse-solutions-water","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/selina-concise-chemistry-class-6-icse-solutions-water\/","title":{"rendered":"Selina Concise Chemistry Class 6 ICSE Solutions – Water"},"content":{"rendered":"

Selina Concise Chemistry Class 6 ICSE Solutions – Water<\/strong><\/span><\/h2>\n

ICSE Solutions<\/a>Selina ICSE Solutions<\/a>ML Aggarwal Solutions<\/a><\/p>\n

APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 6 Chemistry. You can download the Selina Concise Chemistry ICSE Solutions for Class 6 with Free PDF download option. Selina Publishers Concise Chemistry for Class 6 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.<\/p>\n

Selina Class 6 Chemistry ICSE Solutions<\/a>Physics<\/a>Biology<\/a>Maths<\/a>Geography<\/a>History & Civics<\/a><\/p>\n

Selina Concise ICSE Solutions for Class 6 Chemistry Chapter\u00a0 7\u00a0 Water<\/strong><\/p>\n

POINTS TO REMEMBER<\/strong><\/p>\n

    \n
  1. Water cannot be replanished and without water we cannot live.<\/li>\n
  2. 4 \/ 5 th of earth\u2019s surface is covered with water and 1% of this available water is in the form of rivers, lakes, ponds and under ground water. It is utilized for agriculture and living beings consumption.<\/li>\n
  3. In the atmosphere water is present in the form of vapour, mist, clouds etc.
    \n\"Selina<\/li>\n
  4. Distillation : The process of removal of the dissolved salts from sea\/ocean water.<\/li>\n
  5. Purest form of water is rain water as it is formed by evaporation and condensation.<\/li>\n
  6. Sea water is unfit for agriculture as plants do not tolerate saline water.<\/li>\n
  7. Change of water from water bodies (lakes, rivers and oceans) into vapours in air and condensing of vapours and fall in the form of snow, water is called water cycle and water cycle plays an important role in
    \n(i)<\/strong> restoring the lost water from earth\u2019s surface
    \n(ii)<\/strong> in controlling the climatic conditions.<\/li>\n
  8. Water vapour is one of the invisible gases which makes up the air we breathe.<\/li>\n
  9. Drinking water may contain some minerals and salts but it must be free from suspended impurities, harmful bacteria and germs.<\/li>\n
  10. Sometimes water from a source look clear but may contain germs which cause water borne diseases like typhoid, cholera, jaundice, dysentry, gastroenteritis etc.<\/li>\n
  11. Water can be made fit for drinking by
    \n(i)<\/strong> boiling,
    \n(ii)<\/strong> sterilisation
    \n(iii)<\/strong> exposing to air and sunlight
    \n(iv)<\/strong> by chemical treatment like chlorination or ozonisation.<\/li>\n
  12. Water is universal solvent i.e. water can dissolve nearly in every substance.<\/li>\n
  13. Distilled water is the purest form of water but not good for drinking purposes. It is good for medicinal purposes, laboratories and batteries.<\/li>\n
  14. Both stirring and heating help in dissolving the substance in water.<\/li>\n
  15. \u201cThe amount of solute that dissolves in a given quantity of solvent at a given temperature is called solubility of the solute.\u201d<\/li>\n
  16. Air dissolved in water helps aquatic animals and plants to survive.<\/li>\n
  17. Eutrophication :<\/strong> \u201cThe deficiency of oxygen in the water may cause death of aquatic animals. This loss of dissolved oxygen from water in water bodies is called eutrophication.\u201d<\/li>\n<\/ol>\n

    EXERCISE-I<\/strong><\/span><\/p>\n

    Question 1.<\/strong><\/span>
    \nName:<\/strong><\/p>\n

    (a)<\/strong> Three major sources of natural water
    \n(b)<\/strong> Four sources of surface water.
    \n(c)<\/strong> Two underground sources of water.<\/p>\n

    Answer:<\/strong><\/span><\/p>\n

    (a)<\/strong> Three major sources of natural water :<\/p>\n

      \n
    1. Surface water (sea water)<\/li>\n
    2. Above surface water (rain)<\/li>\n
    3. Underground water (springs)<\/li>\n<\/ol>\n

      (b)<\/strong> Four sources of surface water sources :<\/p>\n

        \n
      1. Ocean water<\/li>\n
      2. River water<\/li>\n
      3. Lake water<\/li>\n
      4. Glaciers<\/li>\n<\/ol>\n

        (c)<\/strong> Two sources of underground water :<\/p>\n

          \n
        1. Well water<\/li>\n
        2. Spring water<\/li>\n<\/ol>\n

          Question 2.<\/strong><\/span>
          \nAnswer the following questions in short:<\/p>\n

          (a)<\/strong> In which form is water present in the atmosphere ?
          \n(b)<\/strong> Which source of water contains the highest concentration of salt in it ?
          \n(c)<\/strong> Why is rain water considered the purest form of natural water?
          \n(d)<\/strong> What possible impurities does rain water contain ?
          \n(e)<\/strong> What is water table ?
          \n(f)<\/strong> Why is spring water pure enough for drinking but unsuitable for laboratory use ?
          \n(g)<\/strong> Why the taste of spring water differs at different places ?<\/p>\n

          Answer:<\/strong><\/span><\/p>\n

          (a)<\/strong> Water is present in the form of water vapours in the atmosphere.
          \n(b)<\/strong> Sea water contains highest concentration of salt.
          \n(c)<\/strong> Rain water is the purest form of water as it is distilled water i.e. water from surface of earth has evaporated and then vapours condense in the atmosphere.
          \n(d)<\/strong> The impurities present in rain water are dust and dissolved gases like oxygen, nitrogen and carbon dioxide and these gases are not poisonous, rain water is safe for drinking.
          \n(e)<\/strong> Level of ground water is called water table.
          \n(f)<\/strong> Spring water is free from suspended impurities and germs (harmful bacteria) as water has been filtered through different layers of soil and is fit for drinking. Spring water contains dissolved impurities which are due to the nature of soil surrounding the spring and cannot be used for laboratory purposes, where distilled water free from impurities is needed.
          \n(g)<\/strong> Spring water contains unsolved impurities which have entered the water from surrounding soil and soil impurities (salts) differ from place to place. Hence taste of water differs from place to place.<\/p>\n

          Question 3.<\/strong><\/span>
          \nList three major impurities present in river water.
          \nAnswer:<\/strong><\/span>
          \nThree major impurities present in river water :<\/p>\n

            \n
          1. Suspended impurities like clay and sand particles.<\/li>\n
          2. Harmful bacteria.<\/li>\n
          3. Mineral salts.<\/li>\n<\/ol>\n

            Question 4.<\/strong><\/span>
            \nGive the percentage of water in the following :<\/p>\n

            (a)<\/strong> Rice and wheat grains
            \n(b)<\/strong> Eggs
            \n(c)<\/strong> Tomatoes
            \n(d)<\/strong> Bread
            \n(e)<\/strong> Water melon<\/p>\n

            Answer:<\/strong><\/span>
            \nPercentage of water in :<\/p>\n

            (a)<\/strong> Rice \u2014 3 % to 4% Wheat grain \u2014 3% to 4%
            \n(b)<\/strong> Eggs \u201475%
            \n(c)<\/strong> Tomatoes \u2014 95%
            \n(d)<\/strong> Bread \u201425%
            \n(e)<\/strong> Water melon \u2014 97%<\/p>\n

            Question 5.<\/strong><\/span>
            \nWhat are the three states of water ?
            \nAnswer:<\/strong><\/span>
            \nThree states of water are :<\/strong><\/p>\n

              \n
            1. Ice (solid)<\/li>\n
            2. Liquid (water)<\/li>\n
            3. Gaseous (steam)<\/li>\n<\/ol>\n

              Question 6.<\/strong><\/span>
              \nWhy are ice, liquid water and steam considered to have the same chemical substance ?
              \nAnswer:<\/strong><\/span>
              \nIce, liquid water and steam have same composition i.e. 2 parts hydrogen and one part oxygen by volume and same formula H2<\/sub>O, can be easily transformed from one state to other by heating or cooling.<\/p>\n

              Question 7.<\/strong><\/span>
              \nHow is a cloud formed ?
              \nAnswer:<\/strong><\/span>
              \nWater from the surface of earth, lakes, seas, rivers, formed by plants (transpiration) etc. evaporates and rises high up in the atmosphere and condense into water droplets and collect to form cloud.<\/p>\n

              Question 8.<\/strong><\/span>
              \nWhat is water cycle ? What is its importance ?
              \nAnswer:<\/strong><\/span>
              \nWater cycle : The change of water from one form to another in nature which results in continuous circulation of water from earth\u2019s surface to the atmosphere and from the atmosphere back to the earth\u2019s surface is called water cycle.
              \nImportance of water cycle:<\/strong><\/p>\n

                \n
              1. It assures a continuous supply of water to us.<\/li>\n
              2. In controlling the climatic conditions all over the world.<\/li>\n<\/ol>\n

                Question 9.<\/strong><\/span>
                \nHow are the following formed ?<\/p>\n

                (a) fog<\/strong>
                \n (b) mist<\/strong>
                \n (c) dew<\/strong>
                \n (d) frost<\/strong><\/p>\n

                Answer:<\/strong><\/span><\/p>\n

                (a) Fog :<\/strong> When water vapours change into tiny droplets of water near the ground, fog is formed.
                \n(b) Mist:<\/strong> When tiny droplets of water remain suspended in air it is called mist.
                \n(c) Dew :<\/strong> When the water vapour condenses on cold objects like grass, leaves and flowers in winter in the form of tiny droplets of water called dew.
                \n(d) Frost:<\/strong> When the dew freezes it is called frost.<\/p>\n

                EXERCISE-II<\/strong><\/span><\/p>\n

                Question 1.<\/strong><\/span>
                \nName:<\/strong><\/p>\n

                (a)<\/strong> Two chemicals used to destroy germs present in water.
                \n(b)<\/strong> Two diseases which spread through impure water.
                \n(C)<\/strong> A chemical used for loading.
                \n(d)<\/strong> Two substances which add taste to water.
                \n(e)<\/strong> Two household methods to get safe drinking water.<\/p>\n

                Answer:<\/strong><\/span>
                \n(a)<\/strong> Two chemicals used to kill germs in water are:<\/p>\n

                  \n
                1. Chlorine.<\/li>\n
                2. Potassium permanganate.<\/li>\n
                3. terilizing water with ozone.<\/li>\n<\/ol>\n

                  (b)<\/strong> Two diseases are cholera, dysentry.
                  \n(c)<\/strong> Chemical used for loading is potash alum.
                  \n(d)<\/strong> Minerals and carbon dioxide gas adds taste to water.
                  \n(e)<\/strong> Methods to get safe drinking water:<\/p>\n

                    \n
                  1. Adding chlorine tablets.<\/li>\n
                  2. By adding potassium permanganate crystals.<\/li>\n<\/ol>\n

                    Question 2.<\/strong><\/span>
                    \nAnswer in brief:<\/strong><\/p>\n

                    (a)<\/strong> Why is river water unfit for drinking?
                    \n(b)<\/strong> Why is tap water a mixture?
                    \n(c)<\/strong> What is mineral water?
                    \n(d)<\/strong> What is the purpose of adding bleaching powder to water supplied to the town?
                    \n(e)<\/strong> How is chemically pure water obtained in the laboratory?
                    \n(f)<\/strong> how is water in swimming pool kept free a germs?<\/p>\n

                    Answer:<\/strong><\/span><\/p>\n

                    (a)<\/strong> River water contains mineral salts, suspended impurities like clay, sand particles, organic matter and bacteria and is not fit for drinking.
                    \n(b)<\/strong> Tap water contains, minerals, air, chlorine and other dissolved impurities that varies from place to place, therefore it is a mixture.
                    \n(c)<\/strong> Mineral water is pure water fit for drinking. It is collected from natural source and contains air, minerals and salts free from suspended impuiities, harmful bacteria and germs.
                    \n(d)<\/strong> Adding bleaching powder to water, kills germs and harmful bacteria and viruses present in water.
                    \n(e)<\/strong> Chemically pure water for laboratories is obtained-by distillation. Distilled water does not contain any salt or mineral
                    \n(f)<\/strong> Water in swimming pool kept free from infections and germs by chlorination i.e. treating water with chlorine gas.<\/p>\n

                    Question 3.<\/strong><\/span>
                    \nDefine:<\/strong><\/p>\n

                    (a)<\/strong> Sterilisation
                    \n(b)<\/strong> Sedimentation
                    \n(c)<\/strong> Loading
                    \n(d)<\/strong> Aeration<\/p>\n

                    Answer:<\/strong><\/span><\/p>\n

                    (a) Sterilisation :<\/strong> The process of removal of microorganisms including bacterial spores from water to avoid water borne diseases is known as sterilisation.
                    \n(b) Sedimentation :<\/strong> The setting of suspended solid matter at the bottom of a liquid is called sedimentation.
                    \n(c) Loading :<\/strong> The process of adding a chemical to an impure liquid in order to increase the speed of sedimentation of suspended particles is called loading.
                    \n(d) Aeration :<\/strong> To kill harmful micro-organisms present in filtered water, air underpressure is blown into the filtered water. This process is called aeration.<\/p>\n

                    Question 4.<\/strong><\/span>
                    \nWhat is potable water ? List four characteristics of potable water.
                    \nAnswer:<\/strong><\/span>
                    \nPotable water :<\/strong> Water fit for drinking purposes is called potable water.
                    \nFour characters of drinking water :<\/strong><\/p>\n

                      \n
                    1. It should be transparent.<\/li>\n
                    2. Should have no colour, no odour.<\/li>\n
                    3. Should be free from harmful bacteria and germs.<\/li>\n
                    4. It should contain same salts and minerals needed by the body\u00a0CO2<\/sub>\u00a0to add to taste.<\/li>\n<\/ol>\n

                      Question 5.<\/strong><\/span>
                      \nWhy is water important for plants and animals ?
                      \nAnswer:<\/strong><\/span>
                      \nImportance of water for plants:<\/strong><\/p>\n

                        \n
                      1. Plants need water to prepare their food, for germination and growth to produce fruits, flowers etc.<\/li>\n
                      2. For conduction of food prepared by plants to other-parts of plant i.e., for translocation.<\/li>\n
                      3. Large number of plants live in water; water provides nutrients and oxygen for their survival.
                        \nCrops need water for their growth. Water in the form of rain, washes the dust and smoke deposited on leaves by vehicles and helps the stomata in exchanging gases.<\/li>\n<\/ol>\n

                        Importance of water for animals:<\/strong><\/p>\n

                          \n
                        1. Lot of water is lost by the body of animals by sweating, in the form of urine and evaporation while doing various activities, so to make up for the lost water animals consume a lot of water in the form of drinking.<\/li>\n
                        2. Water keeps the animals fresh and is natural medicine for their many ailments.<\/li>\n
                        3. Water is good solvent and helps in the process of digestion, blood circulation, excretion etc. in the body of organisms.<\/li>\n
                        4. Water is essential for the cleanliness of animals and their surroundings.<\/li>\n<\/ol>\n

                          Question 6.<\/strong><\/span>
                          \nWhat are the three methods of removing germs from natural water. Explain.
                          \nAnswer:<\/strong><\/span>
                          \nThree methods to remove germs :<\/strong><\/p>\n

                            \n
                          1. By boiling :<\/strong> Boiling kills germs present in water.<\/li>\n
                          2. Adding potassium permaganate:<\/strong> By adding potassium permaganate in the well the germs can be killed.<\/li>\n
                          3. Chlorination :<\/strong> After filtration water is passed through chlorination tank here chlorine kills the germs.<\/li>\n<\/ol>\n

                            Question 7.<\/strong><\/span>
                            \nName the steps involved in the purification of drinking water supplied in cities and towns.
                            \nAnswer:<\/strong><\/span>
                            \nThe water source for our towns and cities are river, lakes or underground water which contains suspended and dissolved impurities.
                            \nTo remove these impurities steps involved are :<\/strong><\/p>\n

                              \n
                            1. Loading and sedimentation :<\/strong> to settle the suspended impurities to form a sediment for this purpose potash alum is added.<\/li>\n
                            2. Filtration :<\/strong> The water still contains lighter suspended impurities which are removed by filtration through sand and gravel. In cities ground water is drawn from tube well or submurcible pumps which have filters fitted in them. This clear water still contains germs.<\/li>\n
                            3. Chlorination :<\/strong> To kill germs water is passed into chlorination tank where it is treated with chlorine to kill germs.
                              \nWater is now potable i.e. safer for drinking and supplied to homes.<\/li>\n<\/ol>\n

                              Question 8.<\/strong><\/span>
                              \nWhat is the taste of distilled water ? Why is it not potable?
                              \nAnswer:<\/strong><\/span>
                              \nTaste of water is tasteless i.e. flat. It is because distilled water does not contain any salt or mineral required for our body. So it is not potable water.<\/p>\n

                              Question 9.<\/strong><\/span>
                              \nGive reasons :<\/strong><\/p>\n

                              (a)<\/strong> Ice floats on water.
                              \n(b)<\/strong> Marine life is able to survive in colder regions.
                              \n(c)<\/strong> Water droplets can be seen outside a chilled water bottle.<\/p>\n

                              Answer:<\/strong><\/span><\/p>\n

                              (a)<\/strong> Water has maximum density at 4\u00b0C. Ice is lighter than water therefore it floats on water.
                              \n(b)<\/strong> This anomalous property of water enables aquatic plants and animals to survive in colder regions of world because even when the water of ponds, lakes, river freezes it freezes on the top but remains a liquid below ice layer.
                              \n(c)<\/strong> Sometimes we see water droplets on the outer surface of the glass containing ice-cold water, this is because the water vapour presents in’air, on coming in contact with the cold glass of water, loses energy and gets converted into liquid state, which we see as water droplets.<\/p>\n

                              EXERCISE-III<\/strong><\/span><\/p>\n

                              Question 1.<\/strong><\/span>
                              \nWhy is water called a universal solvent ?
                              \nAnswer:<\/strong><\/span>
                              \nAs water can dissolve in most of the substances, solids, liquid and gaseous. Therefore it is called universal solvent.<\/p>\n

                              Question 2.<\/strong><\/span>
                              \nDefine:<\/strong><\/p>\n

                              (a)<\/strong> Solute
                              \n(b)<\/strong> Solvent
                              \n(c)<\/strong> Solution
                              \n(d)<\/strong> Saturated solutions
                              \n(e)<\/strong> Unsaturated solutions<\/p>\n

                              Answer:<\/strong><\/span><\/p>\n

                              (a) Solute :<\/strong> A solute is a substance that dissolves in a medium which can be water or any other substance. Solute is in smaller quantity in a solution.
                              \n(b) Solvent :<\/strong> A solvent is a medium in which a solute dissolves. It is in large quantity in a solution. Water is the most common solvent. The other solvents are alcohol, carbon tetrachloride etc.
                              \n(c) Solution :<\/strong> A solution is a homogeneous uniform mixture formed by a solute and a solvent.
                              \n(d) Saturated solution :<\/strong> When a solution cannot dissolve any more of solute at a given temperature, it is called saturated solution.
                              \n(e) Unsaturated solution :<\/strong> A solution that can take up more of the solute at a given temperature, is said to be an unsaturated solution.<\/p>\n

                              Question 3.<\/strong><\/span>
                              \nState two factors by which solubility of a solute in a solvent can be increased.
                              \nAnswer:<\/strong><\/span>
                              \nTwo factors are :<\/strong><\/p>\n

                                \n
                              1. Stirring.<\/li>\n
                              2. Increase in temperature.<\/li>\n<\/ol>\n

                                Question 4.<\/strong><\/span>
                                \nWhy do aquatic animals die in boiled water ?
                                \nAnswer:<\/strong><\/span>
                                \nBoiled water is deprived of oxygen i.e. there is no oxygen. For want of oxygen animals die in boiled water.<\/p>\n

                                Question 5.<\/strong><\/span>
                                \nState three differences between water and air.
                                \nAnswer:<\/strong><\/span>
                                \nDifferences between water and air :<\/strong>
                                \nWater :<\/strong><\/p>\n

                                  \n
                                1. Water is liquid and can exist in three states i.e. solid-ice, liquid-water, gas – vapours.<\/li>\n
                                2. Is a compound.<\/li>\n
                                3. H2<\/sub>O is its formula.<\/li>\n<\/ol>\n

                                  Air :<\/strong><\/p>\n

                                    \n
                                  1. Air is gaseous and can exist in liquid state when cooled under pressure.<\/li>\n
                                  2. Is a mixture.<\/li>\n
                                  3. Has no formula.<\/li>\n<\/ol>\n

                                    EXERCISE -IV<\/strong><\/span><\/p>\n

                                    Question 1.<\/strong><\/span>
                                    \nState four ways by which water can be conserved.
                                    \nAnswer:<\/strong><\/span>
                                    \nFour ways to conserve water:<\/strong><\/p>\n

                                      \n
                                    1. Do not allow water to drip from defective taps.<\/li>\n
                                    2. More dams should be built.<\/li>\n
                                    3. More plantation should be done as plants help in bringing rain.<\/li>\n
                                    4. Wastage of water should be avoided.<\/li>\n
                                    5. Close the tap when you are brushing your teeth. Rather use a mug. Close the tap when you are washing clothes, open the tap only when you need it. Reduce, Reuse and recycle should be our mantra<\/li>\n<\/ol>\n

                                      Question 2.<\/strong><\/span>
                                      \nExplain harvesting of water.
                                      \nAnswer:<\/strong><\/span>
                                      \nWhen it rains heavily water runs into streets, drains and wasted we can not make use of it. Our purpose is to catch this rain water, store it for future use when we actually need it. For this harvesting of rain water should be done. Rain water is collected from the roofs and verandas of the buildings with the help of pipes and carried to tanks for storage and is used at the time of need when it is not raining.<\/p>\n

                                      Question 3.<\/strong><\/span>
                                      \nWhat are the three main causes of water pollution ?
                                      \nAnswer:<\/strong><\/span>
                                      \nThree main causes of water pollution :<\/p>\n

                                        \n
                                      1. Addition of waste products from homes.<\/li>\n
                                      2. Addition of waste products from agriculture.<\/li>\n
                                      3. Addition of waste from industries.<\/li>\n
                                      4. Addition of sewage in water bodies.<\/li>\n<\/ol>\n

                                        Question 4.<\/strong><\/span>
                                        \nState the main steps to be taken to prevent water pollution.
                                        \nAnswer:<\/strong><\/span>
                                        \nSteps to be taken to prevent water pollution :<\/strong><\/p>\n

                                          \n
                                        1. Trees and plants be planted along the banks of rivers and canals.<\/li>\n
                                        2. Bathing and cleaning of animals near or in water sources be not allowed.<\/li>\n
                                        3. Use of pesticides, insecticides, fungicides and fertilisers should be reduced.<\/li>\n
                                        4. The polluted water from industries should be treated first and then discharged into water bodies.<\/li>\n
                                        5. Use biodegradable detergents.<\/li>\n
                                        6. Water containing sewage should be passed through sewage treatment plants first and then this water should be used for irrigation.<\/li>\n
                                        7. Wells should be covered properly and washing and cleaning of clothes, utensils and animals should not be done near the well to keep them clean.<\/li>\n<\/ol>\n

                                          Question 5.<\/strong><\/span>
                                          \nWhat are the causes of floods and drought?
                                          \nAnswer:<\/strong><\/span>
                                          \nProblems cause by floods :<\/strong><\/p>\n

                                            \n
                                          1. A rise in the level of water in dams, rivers, lakes etc.<\/li>\n
                                          2. Heavy rainfall also causes floods.<\/li>\n
                                          3. Floods cause extensive damage to crops, property, animal and human life.<\/li>\n
                                          4. Crop-fields, villages and”many low-lying areas get submerged under flood water.<\/li>\n
                                          5. Rains\/floods also affect smaller animals living in the soil.<\/li>\n<\/ol>\n

                                            Problems cause by drought :<\/strong><\/p>\n

                                              \n
                                            1. Crops may die, fodder may become scarce.<\/li>\n
                                            2. Living organisms of the soil die.<\/li>\n
                                            3. Animals may die, plants and trees will not survive.<\/li>\n
                                            4. Soil becomes dry, water level in rivers, lakes, dams etc. may fall. The ground water-level falls.<\/li>\n
                                            5. Drought displaces people from a large number of villages and towns.<\/li>\n<\/ol>\n

                                              Question 6.<\/strong><\/span>
                                              \nState some of the ways in which you as an individual can conserve water.
                                              \nAnswer:<\/strong><\/span>
                                              \nThe ways in which we can conserve water are as follows :<\/strong><\/p>\n

                                                \n
                                              1. Use a bucket for taking it.<\/li>\n
                                              2. Make sure, water does not overflow from overhead tanks of your house.<\/li>\n
                                              3. Close the tap when you are brushing your teeth.<\/li>\n
                                              4. Wash fruits, vegetable in a bowl of water, rather than under a running tap. Water used for washing vegetables may be used to water plants in the garden.<\/li>\n<\/ol>\n

                                                OBJECTIVE TYPE QUESTIONS<\/strong><\/span><\/p>\n

                                                1. Fill in the blanks<\/strong><\/p>\n

                                                (a)<\/strong> Water is a universal;<\/strong> solvent.
                                                \n(b)<\/strong> Rainwater<\/strong> is the purest form of natural water.
                                                \n(c)<\/strong> Sand and dust are suspended impurities in water.
                                                \n(d)<\/strong> Sea water has high concentration of salt (impurity).<\/strong>
                                                \n(e)<\/strong> Water covers nearly 4 \/ 5 th<\/strong> of the surface of the earth.
                                                \n(f)<\/strong> Evaporation of rain water leaves NO<\/strong> residue.
                                                \n(g)<\/strong> Potash alum<\/strong> is the chemical added to water to remove the tiny suspended particles.
                                                \n(h)<\/strong> A solution<\/strong> is a uniform mixture of a solute and a solvent.
                                                \n(i)<\/strong> Ice, water and steam have different physical states but are chemically identical.<\/strong>
                                                \n(j)<\/strong> Boiling kills most of the germs<\/strong> in water.
                                                \n(k)<\/strong> The elements present in the molecules of water are hydrogen<\/strong> and oxygen.<\/strong><\/p>\n

                                                2. Write True or False for the following statements<\/strong><\/p>\n

                                                (a)<\/strong> Water is an element.
                                                \nAnswer.<\/strong> False
                                                \nCorrect:<\/strong> Water is aL compound.<\/p>\n

                                                (b)<\/strong> Tap water does not contain dissolved impurities.
                                                \nAnswer<\/strong>. False
                                                \nCorrect:<\/strong> Tap water contain dissolved impurities.<\/p>\n

                                                (c)<\/strong> Alum is commonly used for removing suspended impurities.
                                                \nAnswer.<\/strong> False
                                                \nCorrect :<\/strong> Alum is commonly used for settling down of suspended impurities.<\/p>\n

                                                (d)<\/strong> Distillation is a good method for purifying water for town supply.
                                                \nAnswer.<\/strong> False
                                                \nCorrect :<\/strong> Distillation is a good method-for purifying water for medicinal purpose.<\/p>\n

                                                MULTIPLE CHOICE QUESTIONS<\/strong><\/span><\/p>\n

                                                Tick (\u221a) the correct alternative from the choice given for the following statements:<\/strong><\/p>\n

                                                1.<\/strong> Water content in human body is<\/p>\n

                                                  \n
                                                1. 70%<\/strong><\/li>\n
                                                2. 75%<\/li>\n
                                                3. 80%<\/li>\n
                                                4. 90%<\/li>\n<\/ol>\n

                                                  2.<\/strong> The purest form of natural water is<\/p>\n

                                                    \n
                                                  1. seawater<\/li>\n
                                                  2. river water<\/li>\n
                                                  3. rainwater<\/strong><\/li>\n
                                                  4. lake water<\/li>\n<\/ol>\n

                                                    3.<\/strong> When the water vapour changes into tiny droplets of water near the ground, it is called<\/p>\n

                                                      \n
                                                    1. mist<\/li>\n
                                                    2. dew<\/li>\n
                                                    3. fog<\/strong><\/li>\n
                                                    4. frost<\/li>\n<\/ol>\n

                                                      4.<\/strong> Water is a<\/p>\n

                                                        \n
                                                      1. compound<\/strong><\/li>\n
                                                      2. element<\/li>\n
                                                      3. mixture<\/li>\n
                                                      4. none of the above<\/li>\n<\/ol>\n

                                                        5.<\/strong> Common salt is obtained from sea water by<\/p>\n

                                                          \n
                                                        1. distillation<\/li>\n
                                                        2. crystallisation<\/li>\n
                                                        3. evaporation<\/strong><\/li>\n
                                                        4. sublimation<\/li>\n<\/ol>\n

                                                          6.<\/strong> Jaundice affects<\/p>\n

                                                            \n
                                                          1. heart<\/li>\n
                                                          2. lungs<\/li>\n
                                                          3. liver<\/strong><\/li>\n
                                                          4. kidney<\/li>\n<\/ol>\n

                                                            7.<\/strong> Chlorination of water is done<\/p>\n

                                                              \n
                                                            1. to kill the germs<\/strong><\/li>\n
                                                            2. to remove the suspended impurities<\/li>\n
                                                            3. to remove the dissolved impurities<\/li>\n
                                                            4. none of the above<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

                                                              Selina Concise Chemistry Class 6 ICSE Solutions – Water ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 6 Chemistry. You can download the Selina Concise Chemistry ICSE Solutions for Class 6 with Free PDF download option. Selina Publishers Concise Chemistry for Class 6 ICSE … Read more<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3034],"tags":[10490,10489,10492,8655,10494,10493,10491,9855,10488,11354,10496,10495,6283,10487],"yoast_head":"\nSelina Concise Chemistry Class 6 ICSE Solutions - Water - CBSE Library<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cbselibrary.com\/selina-concise-chemistry-class-6-icse-solutions-water\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Selina Concise Chemistry Class 6 ICSE Solutions - Water\" \/>\n<meta property=\"og:description\" content=\"Selina Concise Chemistry Class 6 ICSE Solutions – Water ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 6 Chemistry. 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