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In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells.
Reason: In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality.
Detailed Solution
Assertion is correct: in point defects of ionic solids, electrical neutrality is maintained (the given case is an example of metal deficiency defect).
Reason is correct: in Frenkel defect, a cation is dislocated from its lattice site to an interstitial site, maintaining electrical neutrality.
But in Frenkel defect no cation is missing from the crystal, so the Reason is not the correct explanation of the Assertion.
So both A and R are correct but R is not the correct explanation of A.