Assertion :Both Fronkel and Schottky defects are stoichiometric defects. Reason: Both defects change the density of the crystalline solid.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Schottky defect arises when an equal number of cations and anions are missing from the lattice. It is a common defect in ionic compounds of high coordination number where both cations and anions are of the same because of this density of crystal decreases and electricity conduct to a smaller extent.
Frenkel defect arises when some of the ions are occupied by the interstitial spaces leaving lattice empty space. This defect is observed in where the anions much larger than cation because of this density of crystal do not change. So the assertion is the correct reason is incorrect. Hence option C is correct.

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