Core Syllabus Module

Environmental Chemistry

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Atmospheric Pollution

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Water and Soil Pollution

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Chapter Elite-20 Challenge Zone

Target Advanced

JEE Main 2019

LEVELJEE Main

The reaction that is not involved in the ozone layer depletion mechanism in the stratosphere is

(A)

C H_{4} + 2 O_{3} \to 3 C H_{2} = O + 3 H_{2} O

(B)

C l O^{∙} (g) + O (g) \to C l^{∙} (g) + O_{2} (g)

(C)

H O C l (g) h ν O H^{∙} (g) + C l^{∙} (g)

(D)

C F_{2} C l_{2} (g) h ν C l^{∙} (g) + C F_{2} C l^{∙} (g)

JEE Main 2019

LEVELJEE Main

The primary pollutant that leads to photochemical smog is

The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are

(A)

\dot{C} l O + \dot{C} F_{2} C l

(B)

\dot{C} l O + \dot{C} H_{3}

(C)

\dot{C} H_{3} + \dot{C} F_{2} C l

(D)

\dot{C} l + \dot{C} F_{2} C l

LEVELJEE Main

The smog is essentially caused by the presence of

(A)

O_{2}

and

O_{3}

(B)

O_{2}

and

N_{2}

(C)

oxides of sulphur and nitrogen

(D)

O_{3}

and

N_{2}

LEVELJEE Main

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

(A)

slightly lower than that of rain water without thunderstorm

(B)

slightly higher than that when the thunderstorm is not there

(C)

uninfluenced by occurrence of thunderstorm

(D)

which depends on the amount of dust in air

JEE Main 2017

LEVELJEE Main

A water sample has ppm level concentration of following anions : $F^{-} = 10$ $S O_{4}^{2 -} = 100$ $N O_{3}^{-} = 50$ The anion/anions that make/makes the water sample unsuitable for drinking is/are

(A)

Only

N O_{3}^{-}

(B)

Both

S O_{4}^{2 -}

and

N O_{3}^{-}

(C)

Only

F^{-}

(D)

Only

S O_{4}^{2 -}

JEE Main 2019

LEVELJEE Main

The correct set of species responsible for the photochemical smog is

(A)

N_{2}, NO_{2}

and hydrocarbons

(B)

CO_{2}, NO_{2}, SO_{2}

and hydrocarbons

(C)

NO, NO_{2}, O_{3}

and hydrocarbons

(D)

N_{2}, O_{2}, O_{3}

and hydrocarbons

JEE Main 2021

LEVELJEE Main

Given below are two statements: Statement I An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement II Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog. In the light of the above statements, choose the correct answer from the options given below.

(A)

Both statement I and statement II are true.

(B)

Both statement I and statement II are false.

(C)

Statement I is true but statement II is false.

(D)

Statement I is false but statement II is true.

JEE Main 2021

LEVELJEE Main

Which one of the following statements is not correct ?

(A)

Eutrophication indicates that water body is polluted.

(B)

The dissolved oxygen concentration below 6 ppm inhibits fish growth.

(C)

Eutrophication leads to increase in the oxygen level in water.

(D)

Eutrophication leads to anaerobic conditions.

JEE Main 2021

LEVELJEE Main

The statements that are true. (A) Methane leads to both global warming and photochemical smog. (B) Methane is generated from paddy fields. (C) Methane is a stronger global warming gas than $CO_{2}$ . (D) Methane is a part of reducing smog. Choose the most appropriate answer from the options given below

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) Photochemical smog causes cracking of rubber. Reason (R) Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidising. Choose the most appropriate answer from the options given below.

(A)

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(B)

Both (A) and (R) are true and (R) is the correct explanation of (A).

(C)

(A) is false but (R) is true.

(D)

(A) is true but (R) is false.

JEE Main 2021

LEVELJEE Main

Green chemistry in day-to-day life is in the use of

(A)

chlorine for bleaching of paper.

(B)

large amount of water alone for washing clothes.

(C)

Tetrachloroethene for laundry.

(D)

Liquified

CO_{2}

for dry cleaning of clothes.

JEE Main 2021

LEVELJEE Main

The depositions of $X$ and $Y$ on ground surfaces is referred to as wet and dry depositions, respectively. $X$ and $Y$ are

(A)

X = Ammonium salts, Y = CO_{2}

(B)

X = SO_{2}, Y = Ammonium salts

(C)

X = Ammonium salts, Y = SO_{2}

(D)

X = CO_{2}, Y = SO_{2}

LEVELJEE Main

Identify the wrong statements in the following

(A)

Chlorofluorocarbons are responsible for ozone layer depletion

(B)

Green house effect is responsible for global warming

(C)

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

(D)

Acid rain is mostly because of oxides of nitrogen and sulphur

JEE Main 2021

LEVELJEE Main

Given below are two statements. Statement I The pH of rain water is normally ~ 5.6. Statement II If the pH of rain water drops below 5.6, it is called acid rain. In the light of the above statements, choose the correct answer from the options given below.

(A)

Both statements I and II are true.

(B)

Both statements I and II are false.

(C)

Statement I is true but statement II is false.

(D)

Statement I is false but statement II is true.

JEE Main 2019

LEVELJEE Main

The compound that is not a common component of photochemical smog is

(A)

CF_{2} Cl_{2}

(B)

H_{3} C - C (= O) - OONO_{2}

(C)

CH_{2} = CHCHO

(D)

O_{3}

JEE Main 2021

LEVELJEE Main

BOD values (in ppm) for clean water ( $A$ ) and polluted water ( $B$ ) are expected respectively

(A)

A > 50, B < 27

(B)

A > 25, B < 17

(C)

A < 5, B > 17

(D)

A > 15, B > 47

JEE Main 2021

LEVELJEE Main

The gas released during anaerobic degradation of vegetation may lead to

(A)

acid rain

(B)

global warming and cancer

The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be $1000 ppb$ , $40 ppb$ , $100 ppm$ and $0.2 ppm$ , respectively. This water is unsuitable for drinking due to high concentration of

Water samples with BOD values of 4 ppm and 18 ppm, respectively, are

(A)

clean and clean

(B)

highly polluted and clean

(C)

highly polluted and highly polluted

(D)

clean and highly polluted

Micro-Topic Strategy Matrix

Atmospheric Pollution

Water and Soil Pollution

Chapter Elite-20 Challenge Zone

The reaction that is not involved in the ozone layer depletion mechanism in the stratosphere is

The primary pollutant that leads to photochemical smog is

The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are

The smog is essentially caused by the presence of

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

The correct set of species responsible for the photochemical smog is

Which one of the following statements is not correct ?

Green chemistry in day-to-day life is in the use of

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The depositions of X and Y on ground surfaces is referred to as wet and dry depositions, respectively. X and Y are

Identify the wrong statements in the following

Given below are two statements. Statement I The pH of rain water is normally ~ 5.6. Statement II If the pH of rain water drops below 5.6, it is called acid rain. In the light of the above statements, choose the correct answer from the options given below.

The compound that is not a common component of photochemical smog is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively

The gas released during anaerobic degradation of vegetation may lead to

Water samples with BOD values of 4 ppm and 18 ppm, respectively, are

The depositions of $X$ and $Y$ on ground surfaces is referred to as wet and dry depositions, respectively. $X$ and $Y$ are

BOD values (in ppm) for clean water ( $A$ ) and polluted water ( $B$ ) are expected respectively