{"id":40036,"date":"2019-05-03T11:10:53","date_gmt":"2019-05-03T11:10:53","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=40036"},"modified":"2020-11-28T12:53:39","modified_gmt":"2020-11-28T07:23:39","slug":"plus-one-chemistry-chapter-wise-questions-answers-chapter-14","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/plus-one-chemistry-chapter-wise-questions-answers-chapter-14\/","title":{"rendered":"Plus One Chemistry Chapter Wise Questions and Answers Chapter 14 Environmental Chemistry"},"content":{"rendered":"

Plus One Chemistry Chapter Wise Questions and Answers\u00a0Chapter 14 Environmental Chemistry <\/strong>is part of Kerala Plus One Chemistry Chapter Wise Questions and Answers<\/a>. Here we have given Plus One Chemistry Chapter Wise Questions and Answers Chapter 14 Environmental Chemistry.<\/p>\n

Kerala Plus One Chemistry Chapter Wise Questions and Answers Chapter 14 Environmental Chemistry<\/h2>\n

Plus One Chemistry Environmental Chemistry One Mark Questions and Answers<\/h3>\n

Question 1.
\nThe greatest affinity for hemoglobin is shown by
\na) NO
\nb) CO
\nc) O2<\/sub>
\nd) CO2<\/sub>
\nAnswer:
\nb) CO<\/p>\n

Question 2.
\nLondon smog is ___________ in nature.
\nAnswer:
\nreducing<\/p>\n

Question 3.
\nAddition of phosphate fertilizers into water leads to
\na) Increased growth of decomposers
\nb) Reduced algal growth
\nc) Increased algal growth
\nd) Nutrient enrichment
\nAnswer:
\nd) Nutrient enrichment<\/p>\n

Question 4.
\nWhich of the following is a viable particulate?
\na) Algae
\nb) Smoke
\nc) Mist
\nd) Fumes
\nAnswer:
\na) Algae<\/p>\n

Question 5.
\nWhich of the following is not a greenhouse gas?
\na) CO2<\/sub>
\nb) CH4<\/sub>
\nc) O2<\/sub>
\nd) Water vapour
\nAnswer:
\nc) O2<\/sub><\/p>\n

Question 6.
\nMethyl isocyanate is prepared by the action of ___________ on methyl amine
\nAnswer:
\nCOCl2<\/sub><\/p>\n

Question 7.
\nIn a photo chemical smog the gas that causes eye irritation is ___________ .
\na) CO2<\/sub>
\nb) CH4<\/sub>
\nc) PAN
\nd) Acrolein
\ne) both (c) and (d)
\nAnswer:
\nPAN<\/p>\n

Question 8.
\nSuper sonic jet planes can contribute to zone depletion by introduction of the gas straight to the stratosphere
\nAnswer:
\nNO<\/p>\n

Question 9.
\nThe difference between the amounts of dissolved oxygen in a sample of water saturated with oxygen and that after incubation for a period of 5 days is known as.
\nAnswer:
\nBOD<\/p>\n

Question 10.
\nExcess of nitrate ions in drinking water causes.
\nAnswer:
\nMethenoglobinemia<\/p>\n

Plus One Chemistry Environmental Chemistry Two Mark Questions and Answers<\/h3>\n

Question 1.
\nWrite the equation for the combustion of ethane.
\na) Complete combustion
\nb) Incomplete combustion
\nAnswer:
\na) 2C2<\/sub>H6<\/sub>(g) +7O2<\/sub> \u2192 4CO2<\/sub>(g) + 6H2<\/sub>O(v)
\nb) 2C2<\/sub>H6<\/sub>(g)+5O2<\/sub> \u2192 4CO(g) + 6H2<\/sub>O(v)<\/p>\n

Question 2.
\nWrite the three common pollutants.
\nAnswer:
\n1. Gases such as CO and SO2<\/sub>
\n2. Compounds of metals like lead, mercury, zinc.
\n3. Radioactive substance<\/p>\n

Question 3.
\nThree equations are given below. After studying it, write about Acid rain.
\n(1) CO2<\/sub>(g) + H2<\/sub>O(l) \u2192 2H+ (aq) + CO3<\/sub>2-<\/sup>(aq)
\n(2) 2SO2<\/sub>(g) + O2<\/sub>(g) +2H2<\/sub>O(l) \u2192 2H2<\/sub>SO4<\/sub>(aq)
\n(3) 4NO2<\/sub>(g) + O2<\/sub>(g) + 2H2<\/sub>O(l) \u2192 2HNO3<\/sub> (aq)
\nAnswer:
\nOxides of Sulphur and Nitrogen, mist of HCI and Phosphoric acid, etc. present in polluted airdissolve in rain water making it more acidic. This is known as acidic rain. SO2<\/sub> and NO2<\/sub> present in polluted air are the major contributors of acid rain.
\n2SO2<\/sub>(g) +O2<\/sub>(g) + 2H2<\/sub>O(l) \u2192 2H2<\/sub>SO4<\/sub>(aq)
\n4NO2<\/sub>(g) +O2<\/sub>(g) + 2H2<\/sub>O(l) \u2192 2HNO3<\/sub>(aq)<\/p>\n

Question 4.
\nMarble of Taj Mahal reacts with acid rain. What is its result?
\nAnswer:
\nThe marble with which Taj Mahal is made is continuously eaten away by acid rain. It is due to the presence of chemical factories in Agra. The acids present in acid rain react with marble and making the marble dull and rough.
\nCaCO3<\/sub> + H2<\/sub>SO4<\/sub> \u2192 CaSO4<\/sub> +H2<\/sub>O + CO2<\/sub><\/p>\n

Question 5.
\nWhy usage of chlorofluorocarbons being discouraged? or Explain ozone layer depletion?
\nAnswer:
\nThe decomposition of CFC\u2019s destroying ozone. CF2<\/sub>Cl2<\/sub>(g) + hv \u2192 Cl(h) + CF2<\/sub>Cl(g)
\nThe reactive Cl atom reacts with O3<\/sub> to form ClO radical. Cl(g) + O3<\/sub> \u2192 ClO(g) + O2<\/sub>(g)
\nThus each Cl atom produced, can destroy many O3<\/sub> molecules. This leads to ozone depletion.<\/p>\n

Question 6.
\nWhat is meant by BOD?
\nAnswer:
\nIt is biochemical oxygen demand. It is the amount of dissolved oxygen required by micro-organisms to oxidise organic and inorganic matter present in polluted water.<\/p>\n

Question 7.
\n1. How we can control air pollution?
\n2. How does the soil pollution occur?
\nAnswer:
\n1. Air pollution can be controlled by the following ways.
\n\u2022 Exhaust to oxidize CO to CO2<\/sub>.
\n\u2022 CO2<\/sub> level can be maintained by planting trees.
\n\u2022 Hydrogen gas is looked upon as pollution less future fuel.
\n\u2022 The large amount of nitrogen oxides emitted from power plant can be removed by scrubbing it with H2<\/sub>SO4<\/sub>.
\n2. It occurs due to
\n\u2022 Indiscriminate use of fertilizers, pesticides etc.
\n\u2022 Dumping of waste materials.
\n\u2022 Deforestation<\/p>\n

Question 8.
\nWhat do you mean by greenhouse effect?
\nAnswer:
\nGlobal warming is caused by the excess amount of CO2<\/sub> in the atmosphere. When CO2<\/sub> accumulate due to the decrease of trees it will increase the temperature of earth. This leads to melting of ice. So the sea level rises.<\/p>\n

Question 9.
\nWhat do you mean by global warming?
\nAnswer:
\nAs more and more infrared radiations are trapped, the atmosphere becomes hotter and the global temperature rises up. This is known as global warming. There has been a marked increase in the levels of CO2<\/sub> in the atmosphere due to severe deforestation and burning of fossil fuels.<\/p>\n

Question 10.
\nGive two examples in which green chemistry has been applied.
\nAnswer:
\n1) Oxidative cracking process in the formation of ethylene is a significant step.
\n2) Fuel cells for cellular phones have been developed. This cell last for the full life time of the phone.<\/p>\n

Question 11.
\nOxygen play a key role in the troposphere while ozone in the stratosphere.
\ni) How is ozone formed in the atmosphere?
\nii) What are the causes of depletion of ozone layer?
\nAnswer:
\ni) By electric discharge of O2<\/sub> during lightning.
\nii) UV radiations enter to the earth surface and it causes skin diseases.<\/p>\n

Question 12.
\nNo new industries are allowed in thickly populated cities by Government order. Why such an order is issued?
\nAnswer:
\nThe city will be destroyed due to acid rain caused by industrial pollution. The Govt, order was to protect the environment (orthe city).<\/p>\n

Question 13.
\nDiscuss the importance of dissolved oxygen in water.
\nAnswer:
\nIt helps living organisms in water. They inhale dissolved oxygen in water.<\/p>\n

Question 14.
\nDefine environmental chemistry.
\nAnswer:
\nEnvironmental chemistry is defined as the branch of science which deals with the chemical processes occurring in the environment. It involves the study of origin, transport, reactions, effects and the fates of chemical species in the environment.<\/p>\n

Question 15.
\nExplain tropospheric pollution.
\nAnswer:
\nTropospheric pollution occurs due to the presence of gaseous and the particulate pollutants.
\n\u2022 Gaseous air pollutants. These include mainly oxides of sulphur (SO2<\/sub>, SO3<\/sub>), oxides of nitrogen (NO, NO2<\/sub>) and oxides of carbon (CO, CO2<\/sub>) in addition , to hydrogen sulphide (H2<\/sub>S), Hydrocarbons, ozone and other oxidants.
\n\u2022 Particulate pollutants. These include dust, mist, fumes, smoke, smog, etc.<\/p>\n

Question 16.
\nWhich gases are responsible for greenhouse effect? List some of them.
\nAnswer:
\nThe main gas responsible for greenhouse effect is CO2<\/sub>. Other greenhouse gases are methane, nitrous oxide, water vapours, chlorofluorocarbons (CFC\u2019s) and ozone.<\/p>\n

Question 17.
\nA large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish kill.
\nAnswer:
\nExcessive phytoplankton (organic pollutants such as leaves, grass, trash, etc) present in water is biodegradable. A large population of bacteria decomposes this organic matter in water. During this process they consume the oxygen dissolved in water. Water has already limited dissolved oxygen (\u224810 ppm) which gets is further depleted. When the level of dissolved oxygen falls below 6 ppm, the fish cannot survive. Hence, they die and float dead in water.<\/p>\n

Question 18.
\nHow can domestic waste be used as mannure?
\nAnswer:
\nDomestic waste comprises two types of materials, biodegradable such as leaves, rotten food, etc, and non-biodegradable such as plastics, glass, metal scrap, etc. The non-biodegradable waste is sent to industry for recycling. The biodegradable waste should be deposited in the land fills. With the passage of time, it is converted into compost manure.<\/p>\n

Question 19.
\nFor your agricultural field or garden, you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.
\nAnswer:
\nThe compost producing pit should be set up at a suitable place or in a tin to protect ourselves from bad odour and flies. It should be kept covered so that flies cannot make entry into it and the bad odour is minimized. The recyclable material like plastics, glass, newspapers, etc., should be sold to the vendor who further sells it to the dealer. The dealer further supplies it to the industry involved in recycling process.<\/p>\n

Plus One Chemistry Environmental Chemistry Three Mark Questions and Answers<\/h3>\n

Question 1.
\nFish grow in cold water as well as in warm water.
\n1. Do you agree? What is the reason?
\n2. pH of rain water is 5.6. Is it true? What is the reason?
\nAnswer:
\n1. No. Fish grow in cold water. Warm water contains less dissolved O2<\/sub> than cold water,<\/p>\n

2. Normally rain water contains dissolved CO2<\/sub> and hence it shows acidic pH of 5.6.
\nH2<\/sub>O + CO2<\/sub> \\(\\rightleftarrows \\) H2<\/sub>CO3<\/sub> or 2H+<\/sup> + CO2<\/sub>
\nWhen pH of rain water became below 5.6, it becomes acid rain.<\/p>\n

Question 2.
\nWrite the mechanism of formation of photochemical smog.
\nAnswer:
\nAt high temp, the petrol and diesel engines, N2<\/sub> & O2<\/sub> combine to form NO which is emitted into atmosphere. NO is then oxidised in airto form NO2<\/sub> which absorbs sunlight and form NO and free O atom.
\n\"Plus
\nThe O atoms being reactive and combine with O2<\/sub> to form O3<\/sub>.
\nO2<\/sub> (g) + O(g) \u2192 O3<\/sub>(g)
\nThe O3<\/sub> react with NO formed by the photochemical decomposition of NO2<\/sub>.
\nNO(g) + O3<\/sub>(g) \u2192 NO2<\/sub>(g) + O2<\/sub>(g)
\nNO2<\/sub> and O3<\/sub> are good oxidising agents and they react with unburnt hydrocarbons in the polluted airto form substances such as acrolein and formaldehyde. These are the main substances of photochemical smog.<\/p>\n

Question 3.
\n1. What are the major pollutants of water?
\n2. What is meant by eutrophication?
\nAnswer:
\n1. Micro-organism present in domestic sewages, organic wastes, plant nutrients, toxic metals, sediments, pesticides and radioactive substances,<\/p>\n

2. Addition of P to water as PO4<\/sub>3-<\/sup> ion encourages the formation of algae which reduces the dissolved oxygen content of water. This is called eutrophication.<\/p>\n

Question 4.
\n1. Acid rain causes extensive damage to vegetation and aquatic life. )
\ni) What do you mean by acid rain?
\nii) Name the chemicals responsible for acid rain.
\n2. List gases which are responsible for greenhouse effect.
\nAnswer:
\n1. i) When the pH of the rain water drops below 5.6, it is called acid rain.
\nii) Oxides of nitrogen and sulphur mist of hydrochloric acid and phosphoric acid etc.<\/p>\n

2. Such as carbon dioxide, methane, ozone, chlorofluorocarbon compounds (CFC).<\/p>\n

Question 5.
\nStatues and monuments in India such as Tajmahal are affected by acid rain. How?
\nAnswer:
\nThe statues of monuments in India are affected by acid rain. For example, the air in the vicinity of Taj Mahal contains very high levels of oxides of sulphur and nitrogen. This results in acid rain which reacts with marble of Taj Mahal causing pitting.
\nCaCO3<\/sub> + H2<\/sub>SO4<\/sub> \u2192 CaSO4<\/sub> + H2<\/sub>O + CO2<\/sub>
\nCaCO3<\/sub> + 2HNO3<\/sub> \u2192 Ca(NO3<\/sub>)2 +H2<\/sub>O + CO3<\/sub>.
\nAs a result, the monument is being slowly eaten away and the marble is getting decolourised and lustreless. Thus, acid rain is considered as a threat to Taj Mahal.<\/p>\n

Question 6.
\n1. Writethree major consequences of air pollution.
\n2. Write any two suitable methods to control air pollution.
\nAnswer:
\n1. We cannot get pure oxygen for inspire.
\nAir pollution causes global warming.
\nIt leads to acid rain.
\nIt leads to diseases.<\/p>\n

2. Plant trees.
\nReduce the use of motor vehicles.
\nDo not burn plastics.<\/p>\n

Question 7.
\nCarbon monoxide gas is more dangerous than carbon dioxide gas. Why?
\nAnswer:
\nCO combines with haemoglobin to forms a complex entity, carboxyhaemoglobin which is about 300 times more stable than oxy-haemoglobin. In blood, when the concentration of carboxyhaemoglobin reaches 3 -4%, the oxygen-carrying capacity of the blood is significantly reduced. In other words, the body becomes oxygen-starved. This results into headache, nervousness, cardiovascular disorder, weak eyesight etc.<\/p>\n

Plus One Chemistry Environmental Chemistry Four Mark Questions and Answers<\/h3>\n

Question 1.
\nClassify the following pollutants:
\n(a) Carbon monoxide (CO)
\n(b) Detergents
\n(c) Plastic
\n(d) DDT
\n(e) Sewage
\n(f) Cigarette smoke
\nAnswer:<\/p>\n\n\n\n\n\n
Type of Pollution<\/td>\n<\/tr>\n
Air<\/td>\nWater<\/td>\nSoil<\/td>\n<\/tr>\n
CO
\nCigarette
\nsmoke<\/td>\n		DDT
\nDetergent
\nSewage<\/td>\n		DDT
\nPlastic<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Question 2.
\nAs a result of stratospheric pollution, the ozone layer is destructed.
\na) What is ozone layer?
\nb) How is it useful to us?
\nc) Write a harmful effect of ozone layer depletion.
\nAnswer:
\na) The layer of ozone seen in stratosphere is called ozone layer.
\nb) Ozone layer plays a significant role in protecting earth from UV rays.
\nc) Due to ozone layer depletion agricultural crops were found to give reduced yields. Small aquatic organisms which are very sensitive are destroyed due to the increase in the level of UV radiation.<\/p>\n

Question 3.
\na) What is smog?
\nb) What are the adverse effects of photochemical smog?
\nc) Write any two methods to control photochemical smog.
\nAnswer:
\na) Smog is a mixture of smoke and fog. This is the most common example of air pollution that occurs in many cities throughout the world. There are two types of smog:
\n1) Classical smog
\n2) Photochemical smog<\/p>\n

b) Adverse effects of photochemical smog:
\n\u2022 Eye irritants
\n\u2022 Nose irritation
\n\u2022 Head ache
\n\u2022 Chest pain
\n\u2022 Dryness of throat
\n\u2022 Cough
\n\u2022 Difficulty in breathing<\/p>\n

c) 1) Use catalytic converters in automobiles.
\n2) Plant certain plants (e.g. Pinus) which can metabolise nitrogen oxide.<\/p>\n

We hope the Kerala Plus One Chemistry Chapter Wise Questions and Answers Chapter 14 Environmental Chemistry help you. If you have any query regarding Kerala Plus One Chemistry Chapter Wise Questions and Answers Chapter 14 Environmental Chemistry, drop a comment below and we will get back to you at the earliest.<\/p>\n","protected":false},"excerpt":{"rendered":"

Plus One Chemistry Chapter Wise Questions and Answers\u00a0Chapter 14 Environmental Chemistry is part of Kerala Plus One Chemistry Chapter Wise Questions and Answers. Here we have given Plus One Chemistry Chapter Wise Questions and Answers Chapter 14 Environmental Chemistry. Kerala Plus One Chemistry Chapter Wise Questions and Answers Chapter 14 Environmental Chemistry Plus One Chemistry … 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":[42728],"tags":[],"yoast_head":"\nPlus One Chemistry Chapter Wise Questions and Answers Chapter 14 Environmental Chemistry - 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\/plus-one-chemistry-chapter-wise-questions-answers-chapter-14\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Plus One Chemistry Chapter Wise Questions and Answers Chapter 14 Environmental Chemistry\" \/>\n<meta property=\"og:description\" content=\"Plus One Chemistry Chapter Wise Questions and Answers\u00a0Chapter 14 Environmental Chemistry is part of Kerala Plus One Chemistry Chapter Wise Questions and Answers. 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