QJEEM23Ch9922: JEE Main 2023 Chemistry - Class 11 JEEM23Ch9922 Solution: The normal rain water is slightly acidic and its value is…

Question

Verified Solution • 2025–26 Session moderate

The normal rain water is slightly acidic and its

\mathrm{pH}

value is

5.6

because of which one of the following?

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

Accepted Answer

Normally 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.

\begin{aligned} H_{2} O (l) + {CO}_{2} (g) ⇋ H_{2} {CO}_{3} (aq) \\ H_{2} {CO}_{3} (aq) ⇋ H^{+} (aq) + {HCO}_{3}^{-} (aq) \end{aligned}

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