Question

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 :

• A.
  • 2, + 4, – 1
• B.
  • 2, + 6, – 2
• C. 0, + 4, – 2
• D. 0, + 8, – 1

Answer 1

Answer: (D)

0, + 8, – 1

Answer 2

(4)

ZnS + HNO3 $\longrightarrow$ Zn(NO3)2 + H2SO4 + NO2

(+2) (–2) (+5) (+2) (+6) (+4)