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Question

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

A
ZnS
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B
Fe2O3
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C
HgS
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D
PbS
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Solution

The correct options are
C HgS
D PbS
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 HgS and PbS are converted to metals by self reduction process.

2HgS+3O22HgO+2SO2
2HgO+HgS3Hg+SO2

2PbS+3O22PbO+2SO2
2PbO+PbS3Pb+SO2



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