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Statement-I : Density of an ionic solid remains unaffected due to Frenkel defect.
Statement-II: Packing efficiency of hcp structure is 68%.

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Both statements I and II are correct

Statement-I is incorrect and statement-II is correct

Both statements I and II are incorrect

Statement-I is correct and statement-II is incorrect

answer is B.

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Detailed Solution

I) Frenkel defect is a dislocation defect. One of the ion(generally cation) leaves the lattice point and occupies the interstitial site but does not leave the crystal, thus no change in the density of crystal.

II) Packing efficiency of ccp structure is 74%.

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