A binary solid (A⁺ B^-) has a zinc blende structure with B^- ions constituting the lattice and A⁺ ions occupying 25% of the tetrahedral holes. The formula of the solid is

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A₂B

AB₂

AB₄

answer is C.

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Detailed Solution

Suppose the number of B^- ions that constitute the lattice is 100.
The number of tetrahedral sites = 200.
Of these, 25% are occupied by A⁺. Therefore, the number of A⁺= 50.
So, the ratio of A⁺ : B^- = 50 : 100 = 1 : 2.
The formula is AB₂.

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