The presence of ______ in air tarnishes the surface of silver black.

H_{2} S

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S O_{2}

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C O_{2}

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N_{2}

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Solution

The correct option is D $H_{2} S$
The presence of $H_{2} S$ in air tarnishes the surface of silver black.
$4 A g + 2 H_{2} S + O_{2} \to 2 A g S ↓ + 2 H_{2} O$

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