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Question

What is oxidation state of sulphur in the following:
(i) SO2 (ii) PbS

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Solution

(i) Calculation of oxidation state of sulphur in SO2:
Oxidation state of S+(2×oxidation state of oxygen)=0
x+(2×2)=0
x4=0
x=+4
Oxidation state of sulphur in sulphur dioxide is +4.

(ii) Calculation of oxidation state of sulphur in PbS:
Oxidation state of Pb+oxidation state of S=0
+2+x=0
x=2
Oxidation state of sulphur in lead sulphate is -2.

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