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Q.

In the reaction, H2O2 + PbS → H2O + PbSO4, the increase in the oxidation number of sulphur is

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a

2 units

b

4 units

c

6 units

d

8 units

answer is D.

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Detailed Solution

H+12O-12+Pb+2S-2→Pb+2S-6O4+H+12O-2Increase in oxidation state of 'S' (PbS to PbSO4) = -2 to +6 = 8 units.
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