Which of the following gases will not cause acid rain?

S O_{2}

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N O_{2}

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C O_{2}

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O_{3}

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Solution

The correct option is D $O_{3}$
Sulphur present in any fuel combines with oxygen and forms $S O_{2}$ in the combustion chamber. $S O_{2}$ when emitted into the atmosphere, it oxidizes to form $S O_{3}$ . It is soluble in water in the clouds and forms $H_{2} S O_{4}$ (Sulphuric acid).

$S + O_{2} \to S O_{2} + \frac{1}{2} O_{2} ⟶ S O_{3} + H_{2} O \to H_{2} S O_{4}$

Most of the $N O_{x}$ emitted in the form in the forms of $N O$ .
This $N O$ oxidised in the atmosphere to form $N O_{2}$ .
$N O_{2}$ is soluble in water and form $H N O_{3}$ (Nitric Acid).

$N O + \frac{1}{2} O_{2} \to N O_{2} + H_{2} O \to H N O_{3}$

Carbon divide reacts with water to form carbonic acid. Carbonic acid then dissociates to give the hydrogen ion $(H^{+})$ and the hydrogen carbonate ion $(H C O_{3}^{-})$ . The ability of $H_{2} C O_{3}$ to deliver $H^{+}$ classifies this molecule as acid.

$C O_{2} + H_{2} O ⟶ H_{2} C O_{3}$

$H_{2} C O_{3} ⟶ H^{+} + H C O_{3}^{-}$

For $O_{3}$ ,
$O_{3} +$ Ultraviolet $\to O + O_{2}$

$O + O_{3} \to 2 O_{2}$

Net Reaction: $2 O_{3} + U V \to 3 O_{2}$

It does from any acidic component therefore $O_{3}$ will not cause acid rain.

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O_{3}, N_{2} O, N O_{2}, S O_{2}, C O_{2}, S n C l_{2}, C l_{2} O, H C N, + N O_{2}

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