SURFACE CHEMISTRY

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SURFACE CHEMISTRY - 03

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Q1. Which is adsorbed in maximum amount by activated charcoal? *

1 point

CO2

Cl2

Q2. According to Freundlich adsorption isotherm, the amountof gas adsorbed at very high pressure *

1 point

Goes on increasing with pressure

Reaches a constant limiting value

Goes on decreasing with pressure

Increase first and decreases later with pressure

Q3. The role of a catalyst in a reversible reaction is to *

1 point

Alter the equilibrium constant of the reaction

Decrease the rate of backward reaction

Increase the rate of forward reaction

Allow the equilibrium to be achieved quickly

Q4. Catalytic poisons act by *

1 point

Making the products chemically inactive.

Increasing the rate of the backward reaction.

Preferential adsorption on the catalyst surface.

Chemical combination with any one of the reactants.

Q5. A catalyst *

1 point

Itself destroyed in the reaction

Changes the rate constant

Lowers the activation energy

Changes the product

Q6. Active charcoal is a good catalyst because it *

1 point

Has more adsorption power.

Has inert nature toward reagents

Is made up of carbon atoms.

Is very reactive.

Q7. Which of the following kind of catalysis can be explained by the adsorption theory ? *

1 point

Heterogeneous catalysis

Homogeneous catalysis

Enzyme catalysis

Acid - base catalysis

Q8. According to the adsorption theory of catalysis, the speed of the reaction increases because *

1 point

In the process of adsorption, the activation energy of the molecules becomes large

The concentration of reactant molecules at the active centres of the catalyst becomes high due to strong adsorption

Adsorption produces heat which increases the speed of the reaction

Adsorption lowers the activation energy of the reaction

Q9. A catalyst can affect reversible reaction by *

1 point

Changing equilibrium constant

Slowing forward reaction

Attaining equilibria in both directions

None of these

Q10. Which one of the following is an example of homogeneouscatalysis ? *

1 point

Haber’s process of synthesis of ammonia

Catalytic conversion of SO2 to SO3 in contact process

Catalytic hydrogenation of oils

Acid hydrolysis of methyl acetate.

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