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40
MCQ (Single Correct Answer)

Assertion (A) The pH of acid rain is less than 5.6.

Reason (R) Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.

A
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$
B
Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$
C
Both $A$ and $R$ are not correct
D
A is not correct but R is correct
41
MCQ (Single Correct Answer)

Assertion (A) Photochemical smog is oxidising in nature.

Reason (R) Photochemical smog contains $\mathrm{NO}_2$ and $\mathrm{O}_3$, which are formed during the sequence of reactions.

A
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$
B
Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$
C
Both A and R are not correct
D
A is not correct but R is correct
42
MCQ (Single Correct Answer)

Assertion (A) Carbon dioxide is one of the important green house gases.

Reason (R) It is largely produced by respiratory function of animals and plants.

A
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$
B
Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$
C
Both A and R are not correct
D
A is not correct but R is correct
43
MCQ (Single Correct Answer)

Assertion (A) Ozone is destroyed by solar radiation in upper stratosphere.

Reason (R) Thinning of the ozone layer allows excessive UV radiations to reach the surface of earth.

A
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$
B
Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$
C
Both $A$ and $R$ are not correct
D
A is not correct but R is correct
44
MCQ (Single Correct Answer)

Assertion (A) Excessive use of chlorinated synthetic pesticides causes soil and water pollution.

Reason (R) Such pesticides are non-biodegradable.

A
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$
B
Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$
C
Both A and R are not correct
D
A is not correct but R is correct
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