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

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${ZnSO}_{4}$

$Z n S$

${ZnCl}_{2}$

$Z n O$

answer is B.

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Detailed Solution

$Z n O$ when cold it is pure and when hot it becomes impure and this impurity changes $Z n O$ white to yellow. This impurity is known as metal deficiency defect

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