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) Na₂WO₃ (b) Na₂WO₂
(c) NaWO₂ (d) NaWO₃

Answer 1

Answer:

d) NaWO3

Refer to the attachment

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Answer 2

1. 'W' atoms are at eight corners of the cube. Each corner atom contributes one eight to the unit cell. The contribution of 'W' is =1/8×8

=1

2. 'O' atoms are at the centre of 12 edges and each edges contributes one fourth to the unit cell. The contribution of 'O' atoms is =1/4×12

=3

3. 'NA' atoms are present at the centre of the cube and body atoms contributes one to the unit cell, the contribution of 'NA' atoms are 1

4. The final formlua is NAWO3