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  4. Assertion: The pH of acid rain is less than 5.6. Reason: Oxides of nitrogen and sulphur present in the atmosphere dissolves in rain water and form acid.

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Q. Assertion: The $pH$ of acid rain is less than $5.6.$
Reason : Oxides of nitrogen and sulphur present in the atmosphere dissolves in rain water and form acid.

Environmental Chemistry

Solution:

Normally rain water has a pH of 5.6. Oxides of nitrogen and sulphur dissolve in water to form acid rain which has pH < 5.6.