The normal rain water is slightly acidic and its pH value is 5 . 6...

The normal rain water is slightly acidic and its

pH

value is

5 . 6

because of which one of the following ?

Options

A ${CO}_{2} + {H}_{2}O \to {H}_{2}{CO}_{3}$
B ${N}_{2}{O}_{5} + {H}_{2}O \to 2{HNO}_{3}$
C $2{SO}_{2} + {O}_{2} + 2{H}_{2}O \to 2{H}_{2}{SO}_{4}$
D $4{NO}_{2} + {O}_{2} + 2{H}_{2}O \to 4{HNO}_{3}$

Correct answer

A. ${CO}_{2} + {H}_{2}O \to {H}_{2}{CO}_{3}$

Step-by-step solution

Rain water has a $pH$ of $5 - 6$ due to presence of ${H}^{+}$ ions formed by the reaction of rain water with carbon dioxide present in the atmosphere.

${H}_{2}O ( l ) + {CO}_{2} ( g ) ⇌ {H}_{2}{CO}_{3}$

${H}_{2}{CO}_{3} ⇌ {H}^{+} + {HCO}_{3}$

So, the correct option is A.

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