Out of $C u_{2} S$ , $H g S$ , $A g_{2} S$ and $Z n S$ , roasting will convert the minerals into metals in case of ___________.

C u_{2} S, Z n S

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H g S, Z n S

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C u_{2} S, A g_{2} S

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H g S

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Solution

The correct option is D $H g S$
During roasting, sulphide ores are converted into metal oxides. Sometimes, they are converted to sulphates. The roasting of $C u_{2} S, A g_{2} S$ and $Z n S$ does not give metals. However, the roasting of $H g S$ will give mercury metal. The reactions are as follows:
$2 H g S + 3 O_{2} \to 2 H g O + 2 S O_{2}$
$2 H g O \to 2 H g + O_{2}$

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