A solid has a structure in which 'W' atoms are located at the corners of a cubic lattice, oxygen atoms at the edge centre and $\mathrm{Na}$ atom at the body centre. The formula of the compound is

• A

  $\mathrm{NaWO}_2$
• B

  $\mathrm{Na}_2 \mathrm{WO}_3$
• Correct answer
  C

  $\mathrm{NaWO}_3$
• D

  $\mathrm{NaWO}_4$

Solution

$\therefore$ Effective no. of atoms in one unit cell $$ \begin{aligned} & =8 \times \frac{1}{8}+12 \times \frac{1}{4}+1 \times 1 \\ & =1+3+1 \end{aligned} $$ (W) $(\mathrm{O})(\mathrm{Na})$ The formula of the compound $=\mathrm{NaWO}_3$.

Hence, the correct answer is option: 'C'.