Question

A solid has a structure in which $'W'$ atoms are located at the corners of a cubic lattice $'O'$ atoms at the centre of edges and $'Na'$ atoms at the centre of the cube. The formula for the compound is.

• A. $NaWO_{2}$
• B. $NaWO_{3}$
• C. $Na_{2}WO_{3}$
• D. $NaWO_{4}$

Answer 1

Answer: (B)

$NaWO_{3}$

Answer 2

In a unit cell, W atoms at the corner $= \frac{1}{8} \times 8 = 1$

atoms at the centre of edges $= \frac{1}{4} \times 12 = 3$

Na atoms at the centre of the cube = 1

$W:O:Na = 1:3:1,$ hence formula $= NaWO_{3}$