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Assertion (A) : Density decreases due to Schottky defect in ionic solids.
Reason (R) : Due to Schottky defect, equal number of cations and anions will be missing from lattice sites.

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

A is true, R is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is A.

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Detailed Solution

Since equal number of cations and anions are missing from lattice sites, density
decreases due to decrease in mass of crystal , but electrical neutrality is maintained.

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