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Choose the Best Answer · Q21

Q.Assertion: due to Frenkel defect, density of the crystalline solid decreases. Reason: in Frenkel defect cation and anion leaves the crystal.

(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Both assertion and reason are false
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Step 1. Assertion: Frenkel defect decreases the crystal's density -- this is FALSE. Unlike Schottky defect, Frenkel defect does not change density, because the displaced ion never leaves the crystal; it merely relocates to an interstitial site, so no mass is actually removed. …

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