Surface Chemistry Test

Result

Surface Chemistry Test - 65

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Weekly Quiz Competition

Question 1
1 / -0

In a reversible reaction, a catalyst

A
increases the rate of forward reaction only.

B
increases the rate of forward reaction to a greater extent that of the back-ward reaction.

C
increases the rate of forward reaction and decreases that of the backward reaction.

D
increases the rate of forward and backward reaction by the same factor.

Solution
Question 2
1 / -0

A catalyst

A
Increases the free energy change in the reaction.

B
Decrease the free energy change in the reaction.

C
Does not increase and decreases the free energy change in the reaction.

D
Can either decrease or increase the free energy change depending on what catalyst we use.

Solution
Question 3
1 / -0

In the manufacture of $$H_{2}SO_{4}$$ by contact process, the presence of $$As_{2}O_{3}$$ acts as

A
Catalytic promoter

B
Catalytic poison

C
Induced catalyst

D
Auto catalyst

Solution
Question 4
1 / -0

Zeolites are used as catalyst in

A
Petrochemical industries during cracking

B
In the preparation of $$H_{2}SO_{4}$$

C
In the hydrolysis of ester

D
All

Solution
Question 5
1 / -0

Which is not correct for heterogeneous catalysis?

A
The catalyst decreases the energy of activation.

B
The surface of catalyst plays an important role.

C
The catalyst forms an intermediate with the reactants, at the surface.

D
There is no change in the energy of activation.

Solution
Question 6
1 / -0

The decomposition of $$H_{2}O_{2}$$ may be checked by adding a small quantity of phosphoric acid. It is an example of

A
Neutralization

B
Negative catalysis

C
Positive catalysis

D
Catalytic poisoning

Solution
Question 7
1 / -0

Sulphur sol contains

A
Discrete sulphur atoms

B
Discrete sulphur molecules

C
Water dispersed in solid sulphur

D
Large aggregates of sulphur molecules

Solution
Question 8
1 / -0

When freshly precipitated $$Fe(OH)_{3}$$ is boiled with water in the presence of few drops of $$dil. HCl$$, a hydrated ferric oxide sol is obtained. The method is termed as:

A
Electro dispersion

B
Peptization

C
Ultra fltration

D
Dialysis

Solution
Question 9
1 / -0

To coagulate gelatin sol, which of the following is most effective?

A
$$NaCl$$

B
$$Na_{3}PO_{4}$$

C
$$AlCl_{3}$$

D
$$Alcohol$$

Solution
Question 10
1 / -0

Which among the following statements is false?

A
increase of pressure increases the amount of adsorption.

B
increase of temperature may decrease the amount of adsorption.

C
the adsorption may be monolayered or multilayered.

D
particle size of the adsorbent will not affect the amount of adsorption.

Solution