Which of the following has brown colour fumes?

Nitrogen dioxide

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Carbon dioxide

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Sulphur dioxide

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none of the above

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Solution

The correct option is A Nitrogen dioxide
When $N O_{2}^{-}$ is treated with dilute $H_{2} S O_{4}$ , $N O$ is evolved which readily gives brown fumes of $N O_{2}$ with oxygen of the air.
$N O_{2}^{-} + H_{2} S O_{4} ⟶ H S O_{4}^{-} + H N O_{2} \times 3$
$H N O_{2} ⟶ H N O_{3} + H_{2} O + 2 N O$
$3 K N O_{2} + 3 H_{2} S O_{4} ⟶ 3 K H S O_{4} + H N O_{3} + H_{2} O + 2 N O$ .
$2 N O + O_{2} (c o l o u r l e s s) ⟶ 2 N O_{2} (B r o w n F u m e s)$
Also, when Nitrate on reaction with concentrated $H_{2} S O_{4}$ evolves brown fumes of $N O_{2}$ .
$K N O_{3} + H_{2} S O_{4} ⟶ K H S O_{4} + H N O_{3}$
$4 H N O_{3} + C (P a p e r P e l l e t) ⟶ 4 N O_{2} ↑ C O_{2} + 2 H_{2} O$

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