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When PbS is oxidised by H(2)O(2) the inc...

When PbS is oxidised by `H_(2)O_(2)` the increase in oxidation state of sulphur is

A

8

B

5

C

4

D

1

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The correct Answer is:
A
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Pure H_(2)O_(2) is not very stable and decomposes in the presence of light or on standing or heating overset((-1))(H_(2)O_(2l))+overset((2-)) (H_(2)O_((l)))+overset((0))(O_(2(g))) The oxidation state of oxygen in H_(2)O_(2) is 1 it is oxidistion state of zero in O_(2) and is reduced to an oxidation state of -2 in H_(2)O . Thus, this decomposition is an example of auto oxidation reduction reaction or disproportionation reaction. Pure H_(2)O is