Amongst the following statements regarding adsorption, those that are valid are:
(a) ΔH becomes less negative as adsorption proceeds.
(b) On a given adsorbent, ammonia is adsorbed more than nitrogen gas.
(c) On adsorption, the residual force acting along the surface of the adsorbent increases.
(d) With increase in temperature, the equilibrium concentration of adsorbate increases.

A plane electromagnetic wave EZ = 100 cos (6 × 10⁸ t + 4x) V/m, where x is in metre and t is in second. propagates in medium, what is refractive index of the medium?

The process of settling of colloidal particles is known as

Which of the following is not a characteristic of physisorption of a gas on solid surface?

Emulsion is a collodial solution of 

The coagulating power of ions for haemoglobin decreases in the order