Question

An ionic compound is made up of P cations and Q anions. If P are present at alternate corners and Q is present on the body of the diagonal, then the formula of the ionic compound will be ______.

Options

• PQ

• PQ₂

• P₂Q

• P₄Q

Answer 1

An ionic compound is made up of P cations and Q anions. If P are present at alternate corners and Q is present on the body of the diagonal, then the formula of the ionic compound will be  PQ₂.

Explanation:

P atoms at 4 alternate corners contribute `4 xx1/8 = 1/2`, and Q at the body centre contributes 1.
So, the ratio of P : Q in unit cell = `1/2` : 1   ...(Both sides multiplied by 2)

P : Q = 1 : 2

Formula of the ionic compound PQ₂.