Catalytic poisons act by :

making the products chemically inactive.

increasing the rate of the backward reaction.

chemical combination with any one of the reactants.

preferential adsorption on the catalyst surface.

The efficiency of an enzyme in catalysing a reaction is due to its capacity

to form a strong enzyme-substrate complex

to decrease the bond energies of substrate molecule

to change the shape of the substrate molecule

to lower the activation energy of the reaction

The figure given below shows three velocity-substrate concentration curves for an enzyme reaction. What do the curves and c depict respectively?

a-normal enzyme reaction, b-competitive inhibition, c- non-competitive inhibition

a-enzyme with an allosteric modulator added, b-normal enzyme activity, c-competitive inhibition

a-enzyme with an allosteric stimulator, b-competitive inhibitor added, c-normal enzyme reaction

a-normal enzyme reaction, b-noncompetitive inhibitor added, c-allosteric inhibitor edded

Butter is a colloid formed when

fat globules are dispersed in water

Which one of the following statements is not correct in respect of lyophilic sols?

There is a considerable interaction between the dispersed phase and dispersion medium

These are quite stable and are not easily coagulated

Select incorrect statement:

Soap and detergent lower the interfacial surface tension between oil and water

Basic principle of peptization is reverse of coagulation

Soap and detergent used as emulsifiers

Lyophilic sols need stabilizing agent

The stabilization of the dispersed phase in a lyophobic sol is due to

The surface tension of the medium

The formation of an electrical layer between the two phases

white precipitate of is peptized with di. . The sol particle will carry

Sometimes positive and sometimes negative charge

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