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JEE Main levelSingle correct optionDifficulty 2 of 3ss081

Anions $X$ form a ccp lattice and cations $B$ occupy two-thirds of the octahedral voids. The formula of the compound is

A $BX$
B $B X_{2} X X_{3}$
C $B X_{3} X X_{2}$
D $B X_{2} X$

Answer: B

Octahedral voids

= 1

per

X

, so

B

per

X

= 2/3

. Ratio

B : X = 2/3 : 1 = 2 : 3

, giving

B X_{2} X X_{3}

.

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