Question

A cubic solid is made up of two elements P and Q. Atoms of P are present at the corners of the cube and atoms of Q are present at body centre. What is the formula of the compound and what are coordination numbers of P and Q?

• A. $PQ_{2},6:6$
• B. $PQ,6:6$
• C. $P_{2}Q,6:8$
• D. $PQ,8:6$

Answer 1

Answer: (D)

$PQ,8:6$

Answer 2

No. of atoms of $P = 8 \times \frac{1}{2} = 1$

No. of atoms of Q = 1 × 1 = 1

The formula of the compound is PQ.

Coordination no. of P and Q = $8:8$