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a
A - r,q ; B - p ; C - q,r ; D - q
b
A - p ; B - r ; C - p ; D - q
c
A - p,r ; B - p,q ; C - q,r ; D - p
d
A - q ; B - r ; C - q ; D - r
answer is C.
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Detailed Solution
A→p,r;B→p,q;C→q,r;D→pSodium chloride and cesium chloride because of the similar size of cations and anions, show Schottky defect while, AgBr and ZnS show Frenkel defect (as their cation is smaller), AgBr also shows Schottky defect.NaCl and ZnS crystallizes in fcc lattice and have packing efficiency 74%.