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(C) In a zinc blende structure,the anions ($B$ ions) form a $ccp$ (cubic close-packed) lattice.Number of $B$ ions per unit cell $= 4$.The number of te

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$AB_2$

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(C) In a zinc blende structure,the anions ($B$ ions) form a $ccp$ (cubic close-packed) lattice.Number of $B$ ions per unit cell $= 4$.The number of tetrahedral holes in a $ccp$ lattice is twice the number of atoms,which is $2 	imes 4 = 8$.Given that $A$ ions occupy $25\%$ of the tetrahedral holes.Number of $A$ ions $= 25\% 	imes 8 = 0.25 	imes 8 = 2$.The ratio of $A:B = 2:4 = 1:2$.Therefore,the formula of the solid is $AB_2$.

$A$ binary solid 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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