A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal.

H g

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I

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C l

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B r

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Solution

The correct option is A $H g$
Metals low in activity series can be obtained by reducing their sulphides or oxides by heating. Mercury is the only metal that exists as a liquid at room temperature. It can be obtained by heating cinnabar ( $H g S$ ), the sulphide ore of mercury.
The reactions are as follows :

$2 H g S + 3 O_{2} h e a t - - \to 2 H g O + 2 S O_{2} 2 H g O h e a t - - \to 2 H g + O_{2}$

Option A is correct.

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