Which of the following gases turns starch iodide paper blue?

C O_{2}

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S O_{2}

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N O_{2}

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H_{2} S

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Solution

The correct option is B $N O_{2}$
Nitrogen dioxide gas turns starch iodide paper blue.
It reduces iodide to iodine and the free iodine gives blue colour with starch.
$2 K I + 2 N O_{2} \to 2 K N O_{2} + I_{2}$
$I_{2} + s t a r c h \to$ Blue starch iodide
Hence, $N O_{2}$ gas turns starch iodide paper blue.

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