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Q.

When ZnS is boiled with strong nitric acid, the products are zinc nitrate, sulphuric acid and nitrogen dioxide. What are the changes in the oxidation numbers of Zn, S and N ?

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a

+2, +4, -1

b

+2, +6, -2

c

0, +4, -2

d

0, 8, 1

answer is D.

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Detailed Solution

ZnS+2  -2   +  HNO+5   →  Zn+2(N+5O3)2  + H2S+6 O4+N+4O2Change in O.N. of Zn = 0S = 6 - (-2) = 8N = 5 - 4 = 1
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When ZnS is boiled with strong nitric acid, the products are zinc nitrate, sulphuric acid and nitrogen dioxide. What are the changes in the oxidation numbers of Zn, S and N ?