Pick out correct statement(s) regarding non-stochiometric Zinc Oxide.

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It is yellow in colour

It exhibits n-type semi-conduction due to presence of electrons in interstials

When heated in dioxygen and then cooled to room temperature its conductivity increases

When heated in dioxygen and then cooled to room temperature its conductivity decreases

answer is A, B, D.

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Detailed Solution

Stoichiometric $Z n O$ (white) loses $O_{2}$ reversibly and convert into non – stoichiometric $Z n O$ which is yellow in color (metal excess crystal defect) $Z n O_{(s)} ⇌ Z n_{(s)}^{2 +} + \frac{1}{2} O_{2 (g)} + 2 e^{-}$ (n-type conduction)

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