1.Body diagonal of a cube is 866 pm. Its edge length would be

2.In rock salt structure coordination numbers of cation and anion are respectively.

3.Certain intermetallic compound of lithium and silver crystallizes in cubic structure in which both Li and Ag atoms have co-ordination number of 8. To what crystal class does the unit cell belong?

4.In a cubic crystal anions are arranged in FCC and the cations occupy half the tetrahedral voids and all the octahedral voids. The ratio of cations and anions in the crystal is

5.In hexagonal close packing of spheres in three dimensions, the co-ordination number of each spheres is