Assertion :Normally rain water has a pH of 5.6. Reason: $H^{+}$ ions are formed by the reaction of rain water with carbon dioxide present in the air.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Carbon dioxide present in air, react with the rain water to form carbonic acid. Clean rain water has a ph value in range of 5 to 5.5. But when rain combines with nitrogen oxide or sulphur dioxide which is given out of power plants, rain becomes more acidic.

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{SiO}_{2}

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{CaCO}_{3}

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Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

p H

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