Surface Chemistry Test - 35

physisorption forms multi molecules layer because the gas can be adsorbed one over the other by the van der Waals forces, and they are (multi molecular layers) are formed under high pressure.  

Absorption is the process in which a fluid is dissolved by a liquid or a solid (absorbent). Adsorption is the process in which atoms, ions or molecules from a substance (it could be gas, liquid or dissolved solid) adhere to a surface of the adsorbent.

Charcoal is used as a decolourizer as it adsorbs the colouring matter from the coloured solution of sugar. 

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

Activation energy in the different paths lies in the following sequence: $$C < B < A. $$
Lesser is the activation energy, greater is the ease with which the reaction can take place. $$C > B > A$$ . Decreasing ease with which the reaction can take place.

Correct option: C

Hint: The emulsion is a type of colloid which is formed when both dispersed phase and dispersion medium is liquid in nature.

Explanation:

There are two types of Emulsion:-

1. Oil in water type

2. Water in oil type

Cod liver is an example of water in oil type emulsion.

It is a dietary supplement derived from the liver of cod fish (Gadidae). This fish oil contains the omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). It also contains vitamin A and D, this helps to prevent rickets (caused by the deficiency of vitamin D).

Henceforth, Cod liver is a water in oil type emulsion.

When adsorption and absorption both takes place simultaneously, the phenomenon is called sorption.

A,B and C are correct.

The efficiency of enzyme catalysis is due to its capacity to lower the activation energy of the reaction.

When the particles of the adsorbate are held to the surface of the adsorbent by the physical forces, the adsorption is called physical adsorption or physiosorption. It is a reversible process and usually occurs at low temperature. The value of adsorption enthalpy is low in this process. It forms multimolecular layers. No activation energy is required in this process.

In hair cream, both the dispersion medium and dispersed phase are liquids, hence it is an example of emulsion.

The more the liquifiable nature of the gas, the more is the enthalpy of physisorption. Here water is most liquifiable. So maximum value of enthalpy is of water here.