Which of the following sulphides can not be reduced to metal by $H_{2}$ at about $1000^{\circ} C$ ?

H g S

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P b S

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B i_{2} S_{3}

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All of these

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Solution

The correct option is B $P b S$
Hydrogen will reduce sulphide of other metals which lie above it in the Ellingham diagram because free energy change will become more negative and more the difference & more energy will be released and reaction will be more spontaneous.
So it can reduce others but can not reduce $P b S$ as it lies below in the graph.

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Z n S

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