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Question

Mark the correct statement/s about ZnO:

A
It is amphoteric in nature
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B
It is yellow when cold and white when hot
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C
When heated with cobaltous nitrate, it forms a green colored compound - zinc cobaltonitrate also known as Rinmann's green
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D
It is used as a catalyst along with Cr2O3 in the manufacturing of methyl alcohol from water gas
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Solution

The correct options are
A It is amphoteric in nature
D It is used as a catalyst along with Cr2O3 in the manufacturing of methyl alcohol from water gas
a) ZnO is amphoteric in nature.
b) It is white when cold and yellow when hot.
c) Cobalt zincate [Co(ZnO2)] is formed:
2ZnO+2Co(NO3)22Co(ZnO2)+4NO2+O2
d) ZnO is used as a catalyst along with Cr2O3 in the manufracture of methyl alcohol from a mixture of carbon monoxide and hydrogen.

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