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A compound is yellow when hot and white ...

A compound is yellow when hot and white when cold. The compound is:

A

`Al_(2)O_(3)`

B

`PbO`

C

`CaO`

D

`ZnO`

Text Solution

Verified by Experts

The correct Answer is:
D
It is a white powder which become yellow on heating due to change in the structure of lattice(due to cation excess defect ) but again turns white on cooling.
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Knowledge Check

  • A metal oxide is yellow when hot and white when cold. The metal oxide is

    A
    ZnO
    B
    CuO
    C
    PbO
    D
    all of these

  • An inorganic salt is strongly heated. The residue is yellow when hot and white when cold. The salt contains:

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    C
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