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Explain the metal excess defects due to ...

Explain the metal excess defects due to extra cation in the interstitial sites

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When the extra cations are present in the interstitial sites, then such types of defects are known a. metal excess defect. The electrons are also present in the interstitial sites to make the crysta neutral. ZnO shows this type of defect. This type of defect is shown in the figure
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The questions given below consist of an assertion and the reason. Use the following key to choose the appropriate answer. (a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.(c) Assertion is is CORRECT but reason is INCORRECT. (d) If assertion is INCORRECT but reason is CORRECT. (e)If both assertion and reason are INCORRECT. Assertion: In ZnO the excess Zn^(2+) ions are present interstitial sites. REason: Metal excess crystals have either missing cation or anin in intertitial site.

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