Match the terms given in Column I with the compounds given in Column II. Column I Column II (i) Acid rain (a) CHCl 2 - CHF 2 (ii) Photochemical smog (b) CO (iii) Combination with haemoglobin (c) CO 2 (iv) Depletion of ozone layer (d) SO 2 (e) Unsaturated hydrocarbons

(i) Acid rain is due to the presence of CO 2 , NO 2 and SO 2 in air. They combine with rain water and forms carbonic acid, nitrous acid and Sulphurous acid. (ii) Photochemical smog is formed by unburnt fuel (Unsaturated hydrocarbons) and SO 2 . (iii) Combination of CO with haemoglobin gives poisonous carboxy haemoglobin which does not allow oxygen to bind again on it. (iv) Depletion of ozone layer is mainly due to Chlorofluorocarbons. Column I Column II (i) Acid rain (c) and (d) CO 2 and SO 2 (ii) Photochemical smog (e) and (d) Unsaturated hydrocarbons and CO 2 (iii) Combination with haemoglobin (b) CO (iv) Depletion of ozone layer (a) CHCl 2 - CHF 2

Match the pollutant(s) in Column I with the effect(s) in Column II. Column I Column II (i) Oxides of sulphur (a) Global warming (ii) Nitrogen dioxide (b) Damage to kidney (iii) Carbon dioxide (c) Blue baby syndrome (iv) Nitrate in drinking water (d) Respiratory diseases (v) Lead (e) Red haze in traffic and congested areas

(i) Sulphur dioxide is a poisonous gas. It has been reported that even a low concentration of sulphur dioxide causes respiratory diseases e.g., asthma, bronchitis, etc. (ii) The irritant red haze in the traffic and congested places is due to oxides of nitrogen. (iii) The increased amount of carbon dioxide in the air is mainly responsible for global warming. (iv) The maximum limit of nitrate in drinking water is 50 ppm . Excess nitrate in drinking water can cause disease such as methemoglobinemia (‘blue baby’ syndrome) (v) Drinking water gets contaminated with lead when lead pipes are used for the transportation of water. The prescribed upper limit concentration of lead in drinking water is about ppb . Lead can damage kidneys. Column I Column II (i) Oxides of sulphur (d) Respiratory diseases (ii) Nitrogen dioxide (e) Red haze in the traffic and congested places. (iii) Carbon dioxide (a) Global warming. (iv) Nitrate in drinking water (c) Blue baby syndrome (v) Lead (b) Damage to kidneys.

Match the activity given in Column I with the type of pollution created by it given in Column II. Column I Column II (i) Releasing gases to the atmosphere after burning waste material containing Sulphur. (a) Water pollution (ii) Using carbamates as pesticides (b) Photochemical smog, damage to plant life, corrosion to building material, induce breathing problems, water pollution. (iii) Using synthetic detergents for washing clothes (c) Damaging ozone layer (iv) Releasing gases produced by automobiles and factories in the atmosphere. (d) May cause nerve diseases in human. (v) Using chlorofluorocarbon compounds for cleaning computer parts (e) Classical smog, acid rain, water pollution, induce breathing problems, damage to buildings, corrosion of metals.

Releasing gases to the atmosphere after burning waste material containing Sulphur. SO 2 causes acid rain, water pollution, formation of smog, breathing problems, damage to buildings, corrosion of metals. Carbamates are pesticides which are more biodegradable but severe nerve toxins hence, more harmful to humans. Synthetic detergents are non-biodegradable and cause water pollution. These may contain phosphates. The addition of phosphorus to water, in the form of the phosphate anion, encourages the formation of algae, which reduces the dissolved oxygen concentration of water. The process, known as eutrophication, impedes the development of higher life forms, such as fish. Gases released from automobiles and factories in atmosphere cause photochemical smog, damage to plant life, inducing breathing problems and water pollution. Presence of Chlorofluorocarbons in atmosphere are responsible for damaging ozone layer. Column I Column II (i) Releasing gases to the atmosphere after burning waste material containing Sulphur. (e) Classical smog, acid rain, water pollution, induce breathing problems, damage to buildings, corrosion of metals. (ii) Using carbamates as pesticides (d) May cause nerve diseases in human (iii) Using synthetic detergents for washing clothes (a) Water pollution. (iv) Releasing gases produced by automobiles and factories in the atmosphere. (b) Photochemical smog, damage to plant life, corrosion to building material, induce breathing problems, water pollution. (v) Using chlorofluorocarbon compounds for cleaning computer parts (c) Damaging ozone layer

Column I Column II (i) Phosphate fertilizers in water (a) BOD level of water increases (ii) Methane in air (b) Acid rain (iii) Synthetic detergents in water (c) Global warning (iv) Nitrogen oxides in air (d) Eutrophication

Phosphates in water enhance algae growth. Such profuse growth of algae covers the water surface. This process in which nutrients enriched water bodies supports a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity is known as Eutrophication. The warming of the earth due to remission of the sun's energy absorbed by the earth. The remission of earth's energy is absorbed by greenhouse gases and water vapours present near the earth's surface and then its radiation back to the earth is called a greenhouse effect. So the temperature of the Earth is increased is called global warming. These may contain phosphates as additives. The addition of phosphorus to water, in the form of the phosphate anion PO 4 3 – , encourages the formation of algae, which reduces the dissolved oxygen concentration of water. The process, known as eutrophication, impedes the development of higher life forms, such as fish. The rain containing H 2 SO 4 , HNO 3 (and a small amount of HCl ) which are formed from the oxide of sulpher and N 2 present in the air is called acid rain. The P H of acid rain is 4-5. The oxide of nitrogen undergoes oxidation reaction. The reaction with the water vapour present in the atmosphere to form HNO 3 . Column I Column II (i) Phosphate fertilizers in water (d) Eutrophication (ii) Methane in air (b) Global warming (iii) Synthetic detergents in water (a) BOD level of water increases (iv) Nitrogen oxides in air (b) Acid rain

Ozone is a gas heavier than air Why does the ozone layer not settle down near the earth

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 14 - Environmental Chemistry>Short Answer Type>Q 33

Some time ago the formation of polar stratospheric clouds was reported over Antarctica. Why were these formed? What happens when such clouds break up by the warmth of sunlight?

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 14 - Environmental Chemistry>Short Answer Type>Q 34

A person was using water supplied by the Municipality. Due to a shortage of water, he started using underground water. He felt a laxative effect. What could be the cause?

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 14 - Environmental Chemistry>Matching Type>Q 35

Match the terms given in Column I with the compounds given in Column II.

	Column I		Column II
(i)	Acid rain	(a)	${CHCl}_{2} - {CHF}_{2}$
(ii)	Photochemical smog	(b)	$CO$
(iii)	Combination with haemoglobin	(c)	${CO}_{2}$
(iv)	Depletion of ozone layer	(d)	${SO}_{2}$
		(e)	Unsaturated hydrocarbons

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 14 - Environmental Chemistry>Matching Type>Q 36

Match the pollutant(s) in Column I with the effect(s) in Column II.

	Column I		Column II
(i)	Oxides of sulphur	(a)	Global warming
(ii)	Nitrogen dioxide	(b)	Damage to kidney
(iii)	Carbon dioxide	(c)	Blue baby syndrome
(iv)	Nitrate in drinking water	(d)	Respiratory diseases
(v)	Lead	(e)	Red haze in traffic and congested areas

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 14 - Environmental Chemistry>Matching Type>Q 37

Match the activity given in Column I with the type of pollution created by it given in Column II.

	Column I		Column II
(i)	Releasing gases to the atmosphere after burning waste material containing Sulphur.	(a)	Water pollution
(ii)	Using carbamates as pesticides	(b)	Photochemical smog, damage to plant life, corrosion to building material, induce breathing problems, water pollution.
(iii)	Using synthetic detergents for washing clothes	(c)	Damaging ozone layer
(iv)	Releasing gases produced by automobiles and factories in the atmosphere.	(d)	May cause nerve diseases in human.
(v)	Using chlorofluorocarbon compounds for cleaning computer parts	(e)	Classical smog, acid rain, water pollution, induce breathing problems, damage to buildings, corrosion of metals.

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 14 - Environmental Chemistry>Matching Type>Q 38

	Column I		Column II
(i)	Phosphate fertilizers in water	(a)	BOD level of water increases
(ii)	Methane in air	(b)	Acid rain
(iii)	Synthetic detergents in water	(c)	Global warning
(iv)	Nitrogen oxides in air	(d)	Eutrophication

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 14 - Environmental Chemistry>Long Answer Type>Q 46

How can you apply green chemistry for the following:
To control photochemical smog.

MEDIUM

11th CBSE

IMPORTANT

NCERT Exemplar Chemistry - Class 11>Chapter 14 - Environmental Chemistry>Long Answer Type>Q 46

How can you apply green chemistry for the following:
To avoid the use of halogenated solvents in dry cleaning and that of chlorine bleaching.

Ozone is a gas heavier than air. Why does the ozone layer not settle down near the earth?

Important Questions on Environmental Chemistry

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