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which of the following sulphides cannot be reduced to metal by `H_(2)`at about `1000^(@)`C?

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which of the following sulphides cannot be reduced to metal by `H_(2)`at about `1000^(@)`C?
A. HgS
B. PbS
C. `CS_(2)`
D. `Bi_(@)S_(3)`

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Correct Answer - b
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