Assertion(A) : Rainwater normally has a $p H$ $=$ 5.6

Reason (R) : This is due to the presence of $H_{2} S O_{4}$ and $H N O_{3}$ produced from oxides of sulphur and nitrogen.

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

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

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A is true and R is false.

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A is false and R is true

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Solution

The correct option is A A is true and R is false.
Normal rain has a pH of about 5.6. This is because it reacts with carbon dioxide in the atmosphere and forms mildly acidic carbonic acid before it becomes rain.

Acid rains occur due to oxides of nitrogen and sulphur.

Nitric acid & sulphuric acid in the atmosphere dissolve in rainwater and come down to earth as acid rain.

Acid rains have a pH 4.

Therefore, option C is correct

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Assertion(A) : Rainwater normally has a pH = 5.6Reason (R) : This is due to the presence of H2SO4 and HNO3 produced from oxides of sulphur and nitrogen.

Assertion(A) : Rainwater normally has a $p H$ $=$ 5.6

Reason (R) : This is due to the presence of $H_{2} S O_{4}$ and $H N O_{3}$ produced from oxides of sulphur and nitrogen.