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

Options

A. `Na_(2)WO_(3)`
B. `Na_(2)WO_(2)`
C. `NaWO_(2)`
D. `NaWO_(3)`

Answer

D

Explanation

In an unit cell
W atoms at the corner `=(1)/(8)xx8=1`
O aotms at the edge `=(1)/(4)xx12=3`
Na atoms at the centre of body = 1
`:. ` W : O : Na = 1 : 3 : 1
Hence formula is Na`WO_(3)`