For which of the following ores, the process of self reduction can be used?

Z n S

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F e_{2} O_{3}

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H g S

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P b S

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Solution

The correct options are
C $H g S$
D $P b S$
The sulphide ores of less electropositive metals are heated in air so as to convert some part of them into their oxides which then react with the remaining sulphide ore in the absence of air to give the metal and sulphur dioxide. Since, no external reducing agents are added in the process, it is known as self reduction. Among the given options $H g S$ and $P b S$ are converted to metals by self reduction process.

$2 H g S + 3 O_{2} \to 2 H g O + 2 S O_{2}$
$2 H g O + H g S \to 3 H g + S O_{2}$

$2 P b S + 3 O_{2} \to 2 P b O + 2 S O_{2}$
$2 P b O + P b S \to 3 P b + S O_{2}$

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