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Reactivity With Air CO2 and Water (Group 1)

A metal oxide...

Question

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

A

Z n O

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B

C u O

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C

P b O

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D

SiO

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Solution

The correct option is D $Z n O$
Zinc oxide is white in color but on heating it turns into yellow because it loses oxygen reversibly at high temperature.
So answer is A.

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