Which of the following sulphides when heated strongly in air gives the corresponding metal without undergoing separate reduction of oxide?

C u_{2} S

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F e S

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H g S

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Z n S

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Solution

The correct option is C $H g S$
$2 C u_{2} S + 3 O_{2} ⟶ 2 C u_{2} O + 2 S O_{2}$
$2 Z n S + 3 O_{2} ⟶ 2 Z n O + 2 S O_{2}$
$2 P b S + 3 O_{2} ⟶ 2 P b O + 2 S O_{2}$
$2 H g S + 3 O_{2} ⟶ 2 H g O + 2 S O_{2}$
$F e S + O_{2} ⟶ F e + S O_{2}$
$F e S$ when heated directly in air gives $F e$ .

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Zinc, cadmium and mercury are found in nature as sulphides. Values of standard reduction potentials for the half-reactions are :

$M^{2 +} (a q) + 2 e^{-} \to M (s)$

$\begin{matrix} M & E^{\circ} Z n & - 0.76 V C d & - 0.40 V H g & + 0.79 V \end{matrix}$ .

Which sulphides give element not oxide on roasting?

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