1
MCQ (Single Correct Answer)

AIPMT 2000

In cube of any crystal A-atom placed at every corners and B-atom placed at every centre of face. The formula of compound is
A
AB
B
AB3
C
A2B2
D
A2B3

Explanation

A atoms are at 8 corners of the cube

$$ \therefore $$ No. of A atoms per unit cell = 8 $$ \times $$ $${1 \over 8}$$ = 1

B atoms are at the face centre of six faces.

$$ \therefore $$ No. of B atoms per unit cell = 6 $$ \times $$ $${1 \over 2}$$ = 3

Thus, formula of compound = AB3

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