1.

A compound of Zinc which is white in cold state and yellow in hot state, is

Answer»

`ZnS`
`ZnO`
`ZnCl_(2)`
`ZnZO_(4)`

Solution :ZnO when cold it is pure and when hot it BECOMES impure and this impurity CHANGES ZnO white to yellow. This impurity is known as METAL DEFICIENCY DEFECT.


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