SURFACE CHEMISTRY Set 2

1.

Select wrong statement.

If a very small amount of

is added to gold sol, coagulation occurs, but if a large quantity of

is added, there is no coagulation. Organic ions are more strongly adsorbed on charged surfaces in comparison to inorganic ions. Both emulsifier and peptising agents stabilise colloids but their actions are different. Colloidal solutions are thermodynamically stable. NULL NULL NULL

2.

The size of colloidal particles is in between

cm

cm NULL NULL NULL

3.

The Brownian movement occurs in :

Colloidal solution True solution Suspension having size < 500 m

All of the above NULL NULL NULL

4.

Dyeing of fibre involves the process of :

Adsorption Absorption Sorption All of these NULL NULL NULL

5.

Which adsorption takes place at low temperature?

Physical Chemical Both (a) and (b) None of these NULL NULL NULL

6.

Term catalyst was given by

Rutherford Berzilius Wohler Kolbe NULL NULL NULL

7.

The cotterells precipitator is used to :

Neutralize charge on carbon particles in air in smoke Coagulate carbon atoms of smoke Bring in cataphoresis in carbon particles All of the above NULL NULL NULL

8.

A catalyst is a substance which

Is always in the same phase as in the reactions Alters the equilibrium in a reaction Does not participate in the reaction but alters the rate of reaction Participates in the reaction and provide an easier pathway for the same NULL NULL NULL

9.

Multimolecular colloids are present in

Soap solution Sol of proteins Sol of gold All of these NULL NULL NULL

10.

The rate of a certain biochemical reaction catalysed by an enzyme in human body is

times faster than when it carried out in the laboratory. The activation energy of this reaction :

Is zero Is different in two cases Is the same in both the cases None of the above NULL NULL NULL

SURFACE CHEMISTRY Set 2

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SURFACE CHEMISTRY Set 2

Answer & Solution

Answer: Option B

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Congratulations

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