Explain the following:
(e) Nitrogen dioxide is a double acid anhydride.

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Solution

Nitrogen dioxide ${N O}_{2}$ is also called double acid anhydride or mixed anhydride because it can produce two acids, nitric acid, and nitrous acid when it reacts with water.

The balanced chemical reaction of nitrogen dioxide with water is shown below,
$2 {N O}_{2} + H_{2} O \to {H N O}_{2} + {H N O}_{3}$

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One of the following does not contribute in producing acid rain. This one is:

(a) nitrogen dioxide

(b) nitrogen monoxide

(d) sulphur dioxide

Which of the following gas does not contribute to the formation of acid rain ?

(a) nitrogen monoxide

(b) carbon monoxide

(d) nitrogen dioxide

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