__________ gas turns colourless nitrogen monoxide into brown fumes of nitrogen dioxide.

Chlorine

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Oxygen

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Methane

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Fluorine

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Solution

The correct option is B Oxygen
On passing air to $N O$ , $N O_{2}$ is formed. It is brown in color.
$2 N O_{(g)} + O_{2 (g)} \to 2 N O_{2 (g)}$

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__________ gas turns colourless nitrogen monoxide into brown fumes of nitrogen dioxide.

The correct option is B OxygenOn passing air to NO, NO2 is formed. It is brown in color.2NO(g)+O2(g)→2NO2(g)

The correct option is B Oxygen
On passing air to $N O$ , $N O_{2}$ is formed. It is brown in color.
$2 N O_{(g)} + O_{2 (g)} \to 2 N O_{2 (g)}$