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Assertion (A) : The pH of acid rain is l...

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.

A

Both A and R are correct and R is the correct explanation of A

B

Both A and R are correct and 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

Text Solution

Verified by Experts

The correct Answer is:
B
Both assertion and reason are correct but reason is not the correct explanation of asseration.
Number of rain water has a pH of 5.6 due to the presence of `H^(+)` ions formed by the reaction of rain water with carbon dioxide present in the atmosphere.
`H_(2)O(l) + CO_(2)(g) rarr H_(2)CO_(3)(aq)`
`H_(2)CO_(3)(aq) hArr H^(+)(aq) + HCO_(3^(-))(aq)`
When the pH of rain water drops below `5.6` it is called acid rain.
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