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JEE • CHEMISTRY • ENVIRONMENTAL CHEMISTRY

Environmental chemistry practice · Mixed difficulty

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 91-120 of 135 questions

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91 Easy

91 of 135

Understanding +4 | -1

Green chemistry involves

View answer and explanation

Correct option: D

Use of non toxic reagents and solvents to produce environment friendly products

Option D is correct because green chemistry focuses on using non-toxic substances to create environmentally friendly products.

92 Medium

92 of 135

Remembering +4 | -1

In which of the following regions hydrogen and helium are
found?

View answer and explanation

Correct option: C

Exosphere

Option C (Exosphere) is correct because hydrogen and helium are the primary constituents of the exosphere, the outermost layer of the atmosphere.

93 Easy

93 of 135

Remembering +4 | -1

Minamata disease is due to pollution of

View answer and explanation

Correct option: C

Industrial waste mercury into fishing water

Option C (Industrial waste mercury into fishing water) is correct because Minamata disease is caused by mercury poisoning due to the consumption of fish contaminated with industrial mercury waste.

94 Easy

94 of 135

Remembering +4 | -1

The smog is essentially caused by the presence of

View answer and explanation

Correct option: C

Oxides of sulphur and nitrogen

Correct Answer + Core Reason: Option C (Oxides of sulphur and nitrogen) is correct because smog is primarily caused by the presence of oxides of sulfur and nitrogen in the atmosphere.

95 Easy

95 of 135

Remembering +4 | -1

The poisonous gas evolved in Bhopal tragedy from the pesticide plant of Union Carbide Co. was:

View answer and explanation

Correct option: B

Methyl isocyanate

Option B (Methyl isocyanate) is correct because methyl isocyanate (MIC) was the poisonous gas released during the Bhopal tragedy.

96 Easy

96 of 135

Understanding +4 | -1

How can photochemical smog be controlled?

View answer and explanation

Correct option: C

By using catalytic convertors in the automobiles/industry.

Option C is correct because catalytic converters reduce nitrogen oxides, a key component of photochemical smog.

97 Medium

97 of 135

Remembering +4 | -1

Photochemical smog does not contain

View answer and explanation

Correct option: B

S{O_2}

Option B (

S{O_2}

) is correct because photochemical smog is characterized by the presence of ozone, PAN, and nitrogen oxides, but not sulfur dioxide.

98 Easy

98 of 135

Remembering +4 | -1

Ozone layer of upper atmosphere is being destroyed by

View answer and explanation

Correct option: A

Chlorofluorocarbon

Option A (Chlorofluorocarbon) is correct because Chlorofluorocarbons (CFCs) are the primary cause of ozone layer depletion.

99 Easy

99 of 135

Remembering +4 | -1

The actual base pairs present in the double helical structure containing adenine (A), thymine (T), cytosine (C) and guanine (G) are

View answer and explanation

Correct option: C

AT and GC

Option C (AT and GC) is correct because adenine (A) always pairs with thymine (T), and guanine (G) always pairs with cytosine (C) in DNA.

100 Medium

100 of 135

Remembering +4 | -1

Chlorofluorocarbons (CFCs) are widely used in air conditioners, refrigerators etc because of being

View answer and explanation

Correct option: C

Non reactive

Option C (Non reactive) is correct because Chlorofluorocarbons (CFCs) are widely used due to their non-reactive, non-flammable, and non-toxic properties.

101 Easy

101 of 135

Remembering +4 | -1

Air pollution that occurs in sunlight is

View answer and explanation

Correct option: B

oxidising smog

Option B (oxidising smog) is correct because photochemical smog, which occurs in sunlight, is characterized by the presence of oxidizing agents like ozone and peroxyacetyl nitrate (PAN).

102 Medium

102 of 135

Analyzing +4 | -1

Assertion: London smog is oxidising in nature.
Reason: London smog contains

{O}_3, {NO}_2

and hydrocabons.

View answer and explanation

Correct option: D

Both Assertion and Reason are false

Option D (Both Assertion and Reason are false) is correct because London smog is reducing in nature and does not primarily contain

O_3

NO_2

, and hydrocarbons.

103 Medium

103 of 135

Remembering +4 | -1

Bio-degradable pollutant pair is

View answer and explanation

Correct option: A

Domestic waste and sewage

Option A (Domestic waste and sewage) is correct because domestic waste and sewage are organic materials that can be decomposed by microorganisms, making them biodegradable pollutants.

104 Medium

104 of 135

Understanding +4 | -1

The irritant red haze in the traffic and congested places is due to the presence of which of the following ?

(i) Oxides of sulphur

(ii) Oxides of nitrogen

(iii) Carbon dioxide

(iv) Mists, smoke and dust

(v)

\mathrm{Smog}

View answer and explanation

Correct option: C

Only (ii)

Option C (Only (ii)) is correct because the irritant red haze in traffic and congested areas is primarily due to the presence of oxides of nitrogen.

105 Medium

105 of 135

Remembering +4 | -1

Ozone has the ability to absorb

View answer and explanation

Correct option: A

UV radiations

Option A (UV radiations) is correct because the ozone layer absorbs harmful ultraviolet (UV) radiations from the sun.

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106 Medium

106 of 135

Understanding +4 | -1

Identify the wrong statement in the following

View answer and explanation

Correct option: D

Ozone layer does not permit infrared radiation from the sun to reach the earth

Option D (Ozone layer does not permit infrared radiation from the sun to reach the earth) is the wrong statement because the ozone layer primarily blocks ultraviolet (UV) radiation, not infrared radiation.

107 Easy

107 of 135

Remembering +4 | -1

Lack of oxygen at high altitude produces:

View answer and explanation

Correct option: B

Anoxia

Option B (Anoxia) is correct because anoxia refers to the deficiency of oxygen reaching the tissues, which can occur at high altitudes due to lower atmospheric pressure and reduced oxygen availability.

108 Medium

108 of 135

Remembering +4 | -1

Which compound is not included under pollutant?

View answer and explanation

Correct option: B

\mathrm{CO}_2

Option B (

\mathrm{CO}_2

) is correct because carbon dioxide is a natural component of the atmosphere and is not considered a pollutant at normal concentrations.

109 Medium

109 of 135

Remembering +4 | -1

Lead pollution is mainly caused by

View answer and explanation

Correct option: C

Coal gasoline

Option C (Coal gasoline) is correct because leaded gasoline was a major source of lead pollution due to the use of tetraethyllead as an antiknock agent.

110 Medium

110 of 135

Remembering +4 | -1

Which of the following is the hottest region of the atmosphere?

View answer and explanation

Correct option: C

Thermosphere

Option C (Thermosphere) is correct because the thermosphere absorbs high-energy radiation from the sun, causing it to heat up significantly.

111 Easy

111 of 135

Remembering +4 | -1

Air pollution is not caused by

View answer and explanation

Correct option: B

Hydroelectric power

Option B (Hydroelectric power) is correct because hydroelectric power generation does not directly release pollutants into the air, unlike industries and automobiles.

112 Easy

112 of 135

Remembering +4 | -1

Methane gas producing field is

View answer and explanation

Correct option: B

Paddy field

Option B (Paddy field) is correct because paddy fields are known to produce methane gas due to anaerobic decomposition of organic matter.

113 Medium

113 of 135

Remembering +4 | -1

Phosphate pollution is caused by

View answer and explanation

Correct option: D

Sewage and agricultural fertilizers

Option D (Sewage and agricultural fertilizers) is correct because these are the primary sources of phosphate pollution in water bodies.

114 Easy

114 of 135

Remembering +4 | -1

The compound responsible for depletion of ozone layer is

View answer and explanation

Correct option: C

Both (1) and (2)

Option C (Both (1) and (2)) is correct because both Methyl chloroform and Carbon tetrachloride are known to contribute to the depletion of the ozone layer.

115 Medium

115 of 135

Remembering +4 | -1

The instrument used for measuring soil salinity is

View answer and explanation

Correct option: C

Conductivitymeter

Option C (Conductivitymeter) is correct because a conductivity meter measures the electrical conductivity of the soil, which is directly related to its salinity.

116 Easy

116 of 135

Remembering +4 | -1

A fertile soil is likely to have a

pH

of:

View answer and explanation

Correct option: C

5.5 - 7

Option C (

5.5 - 7

) is correct because a fertile soil typically has a pH range of 5.5 to 7, which is slightly acidic to neutral, allowing for optimal nutrient availability for plants.

117 Easy

117 of 135

Remembering +4 | -1

Green house effect is caused by

View answer and explanation

Correct option: D

\mathrm{C}{\mathrm{O}_2}

Option D (CO2) is correct because carbon dioxide is a major greenhouse gas that contributes significantly to the greenhouse effect.

118 Easy

118 of 135

Remembering +4 | -1

Which of the following is the uppermost region of the atmosphere?

View answer and explanation

Correct option: C

Exosphere

Option C (Exosphere) is correct because the exosphere is the outermost layer of Earth's atmosphere, gradually merging with interplanetary space.

119 Medium

119 of 135

Remembering +4 | -1

All oxides of

\mathrm{N}

are common pollutant except

View answer and explanation

Correct option: B

\mathrm{N}_2 \mathrm{O}_5

Option D (

\mathrm{N}_2 \mathrm{O}_5

) is correct because while other nitrogen oxides are common pollutants,

\mathrm{N}_2 \mathrm{O}_5

is less stable and less prevalent as a direct pollutant.

120 Medium

120 of 135

Remembering +4 | -1

Burning of fossil fuels is the main source of

View answer and explanation

Correct option: D

Sulphur dioxide

Option D (Sulphur dioxide) is correct because burning fossil fuels releases sulphur dioxide, a major air pollutant.

Revision notes and key takeaways

Review ENVIRONMENTAL CHEMISTRY in your textbook or class notes, then use this set to check your understanding.

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Environmental chemistry practice · Mixed difficulty

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