Correct Answer – B
In a unit cell,
W atoms at the corner `=(1)/(8)xx8=1`
O atoms at the centre of edges `=(1)/(4)xx12=3`
Na otoms at the centre of the cube = 1
`W:O:Na=1:3:1` . Hence formula is `NaWO_(3)` .

Correct answer is: (B) NaWO₃

W at corner;\(\cfrac{1}{8}\times 8=1\)

O at centres of edges; \(\cfrac{1}{2}\times 6=3\)

Na at centre of cube = 1

Na : W : O

1 : 1 : 3

Correct Answer – b
in a unit cell, `W` atoms at the corner `= (1)/(8) xx 8 = 1`
`O` atoms at the center of edge `= (1)/(4) xx 12 = 3`
Na atoms at the center of the cube `= 1`
`W : O : Na = 1 : 3: 1` , hence formula `= NaWO_(3)`