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JEE Main levelSingle correct optionDifficulty 2 of 3ss117

In a compound the anion $X$ forms a ccp lattice and the cation $M$ occupies two-thirds of the octahedral voids. The formula of the compound is

A $MX X_{3}$
B $M X_{3} X X_{2}$
C $MX X_{2}$
D $M X_{2} X X_{3}$

Answer: D

Octahedral voids

= N

for

N

anions. Cations

= \frac{2}{3} N

. Ratio

M : X = 2 : 3

, so the formula is

M X_{2} X X_{3}

.

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