Explain the defects arising due to anionic va | vedclass

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(C) $1$. Metal excess defect due to anionic vacancies: This occurs when a negative ion is missing from its lattice site,leaving a hole that is occupie

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Both $A$ and $B$

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(C) $1$. Metal excess defect due to anionic vacancies: This occurs when a negative ion is missing from its lattice site,leaving a hole that is occupied by an electron to maintain electrical neutrality. This electron is called an $F$-center,which imparts color to the crystal (e.g.,$NaCl$ turns yellow). $2$. Metal excess defect due to extra cations: This occurs when extra positive ions occupy interstitial sites,and an equivalent number of electrons occupy other interstitial sites to maintain electrical neutrality (e.g.,$ZnO$ turns yellow on heating).

Explain the defects arising due to anionic vacancies and due to the presence of extra cations in the interstitial sites.

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