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Q.

What is the product formed when ZnS is heated in the presence of air?

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a

Zn

b

ZnC

c

Zn2O

d

ZnO

answer is A.

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Detailed Solution

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Zinc blend (ZnS) is a zinc sulfide ore. Roasting (heating in the presence of air) converts sulfide ores to metal oxides. The zinc blend is transformed to zinc oxide when heated in the presence of excess air.

2 ZnS + 3 O2  → 2 ZnO + 2 SO2

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