The Ellingham diagram for a number of me...

The Ellingham diagram for a number of metallic sulphides is shown below.

Which of the following sulphides can not be reduced to metal by `H_2` at about `1000^@C` ?

A

HgS

B

PbS

C

`Bi_(2)S_(3)`

D

All of these

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The correct Answer is:

B

PbS

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