Solid State Test - 2

The edge length of face centred unit cube cell (rock salt type) is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is

In a compound AB₂, the co-ordination number of A is eight then co-ordination number of B is

How many Cl¯ ions are there around Na⁺ ion in NaCl crystal?

The 8 : 8 type of packing is present in

Lithium borohydride crystallizes in a orthorhombic system with 4 molecules per unit cell. The unit cell dimensions are a = 6.8 Å, b = 4.4 Å and c = 7.2 Å. If the molar mass is 21.76, then the density of crystals is

In a normal spinel type structure, the oxide ions are arranged in ccp whereas 1/8 tetrahedral holes are occupied by Zn²⁺ ions and 50% of octahedral holes are occupied by Fe³⁺ ions. The formula of the compound is

A mineral MX₂ crystallizes in ccp of M²⁺ ions. The number of cations and anions per unit cell, the coordination number of cation and percent of tetrahedral voids occupied are

Zinc sulphide exhibits two crystalline form: zinc blend and wurtzite having the same 4:4 coordination.