Question

The NaCl structure can be converted into CsCl structure :

• A. by application of high pressure
• B. by heating to 760 K
• C. both by heat and pressure
• D. by no means

Answer 1

The correct option is A by application of high pressure

Increase in pressure increases the coordination number and increase in temperature lowers the coordination number. That means on increasing the temperature of CsCl structure coordination number decreases from

8 : 8 to 6 : 6 and on increasing the pressure of NaCl structure to high pressure, it will increase coordination number from 6: 6 to 8: 8.

Hence, the correct option is $\text{A}$