A pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature, and still at higher temperature  turbidity completely disappears.  This behaviour is a characteristic of substances forming:

In a closed flask of 5 L, 1.0 g of H₂ is heated from 300 to 600 K.  Which statement is not correct?

In the fluorite structure, the coordination number of Ca²⁺ ion is :

Absolute zero is defined as the temperature:

Which on of the following statements is  wrong for gases? 

If a gas expands at constant temperature, it indicates that:

With which one of the following elements  should silicon be doped so as to give p - type of semiconductor? 

The number of atoms contained in a fcc unit cell of a mono atomic substance is:

Zn converts from its melted state  to its solid state. It has HCP structure. Then find out the number of nearest atoms.