Question

Statement: Increase in pressure in ionic solids may decrease its co-ordination number.

State whether the given statement is true or false.

• A. True
• B. False

Answer 1

The correct option is A True

Pressure and temperature also influence the structure of ionic solids. The structures of chlorides, bromides and iodides of sodium, potassium and rubidium having $6:6$ Co-ordination at normal temperature and pressure changes to $8:8$ co-ordination like CsCl structure at high pressure, Thus, high pressure increases co-ordination number. Furthermore, CsCl structure changes to NaCl structure at $760$ K. Thus, high temperature decreases co-ordination number.

Hence, the given statement is $true$