Assertion : Light is produced in gases in the process of electric discharge through them at high pressure.
Reason : At high pressure electrons of gaseous atoms collide and reach and excited state.

Assertion : Gases become denser at high pressure . Reason : At high pressures , gases deviate from Boyle's law .

In the phenomenon of electric discharge through gases at low pressure , the coloured glow in the tube appears as a result of

In the phenomenon of electric discharge through gases at low pressure , the coloured glow in the tube appears as a result of

In the phenomenon of electric discharge through gases at low pressure,the coloured glow in the tube appears as a result of :

Assertion: The solubility of gases always increases with increase in pressure. Reason: High pressure favours the change where volume decreases.

Assertion : Compressibility factor (Z) is the ratio of actual molar volume of a gas to the molar volume of it , if it were an ideal gas at that temperature and pressure . Reason : At high pressure all the gases have Z lt 1 and can be easily compressed .