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 atom at centre of the cube. The formula for the compound is (AllMS 2018) (a) NaWO (b) NaWO (c) Na WO (d) Na WO

In a unit cell, W atoms at the corner 1 8 1 8 x O atoms at the centre of edges 1 12 3 4 x Na atoms at the centre of the cube = 1 W:O : Na 1:3:1 Hence, formula of compound is NaWO₃. 45. A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cation occupy 75% of octahedral voids. The formula of the compound is : (NEET 2019) (a) 2 3 C A (b) 3 2 C A (c) 3 4 C A (d) 4 3 C A Oh void (C) : HCP (A) No of ions 75 6 : 6 100 >> x 3 :1 4 3 4 3: 4 C A