Surface Chemistry Test

Result

Surface Chemistry Test - 66

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Weekly Quiz Competition

Question 1
1 / -0

A catalytic poison renders the catalyst ineffective because

A
it is preferentially adsorbed on the catalyst.

B
it adsorbs the molecules of the reactants.

C
it combines chemically with the catalyst.

D
it combines with one of the reactant.

Solution
Question 2
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Among the following, which is the correct statement about milk?

A
Milk is an emulsion of liquid fat in water

B
Milk in emulsion of protein in water

C
Milk is stabilized by protein

D
Milk is stabilized by fat

Solution
Question 3
1 / -0

$$Fe^{3+}$$ ions coagulate blood. This shows that blood contains colloidal particles bearing

A
negative charge

B
positive charge

C
no charge

D
either positive or negative charge

Solution

As the positive ion is coagulating blood and opposite charge coagulate colloidal solutions, therefore blood is negatively charged colloidal solution.
Question 4
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Which of the following statements is false for catalyst?

A
A catalyst initiates the reaction.

B
It does not alter the position of equilibrium in a reversible reaction.

C
A catalyst remains unchanged in quantity and composition at the end of reaction.

D
Catalysts are sometimes very specific in respect of a reaction.

Solution
Question 5
1 / -0

Peptization is a process of

A
precipitating the colloidal particles.

B
purifying the colloidal sol.

C
dispersing the precipitate into colloidal sol.

D
movement of colloidal particles towards the opposite charged electrodes.

Solution
Question 6
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Which of the following statements is incorrect about catalyst?

A
A catalyst catalyses a spontaneous chemical reaction.

B
A catalyst catalyses all chemical reaction, whether spontaneous or non-spontaneous.

C
A catalyst provides alternate path of chemical reaction.

D
A catalyst does not involve in a chemical reaction.

Solution
Question 7
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The following information is available for the reaction: $$R \rightarrow P$$
$$R \rightarrow P; rate = r_{1}$$
$$R \overset{A}\rightarrow P; rate = r_{2}$$
$$R \overset{B}\rightarrow P; rate = r_{3}$$
$$R \overset{C}\rightarrow P; rate = r_{4}$$
$$R \overset{D}\rightarrow P; rate = r_{5}$$
$$R \overset{A + C}\rightarrow P; rate = r_{6}$$
$$R \overset{A+ D}\rightarrow P; rate = r_{7}$$
If $$r_{3} < r_{1} = r_{4} = r_{5} < r_{7} < r_{2} < r_{6}$$, then the only incorrect statement is

A
B is an inhibitor.

B
C is a catalytic promoter of catalyst A.

C
D is a catalytic poison of catalyst A.

D
A is a catalytic promoter of catalyst C.

Solution
Question 8
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Regarding criteria of catalyst, which one of the following statements is not true?

A
The catalyst is unchanged chemically after the reaction.

B
A small quantity of catalyst is often sufficient to bring about a considerable amount of the reaction.

C
In reversible reaction, the catalyst alters the equilibrium position.

D
The catalyst alters the rate of reaction.

Solution
Question 9
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Directions For Questions

The charge on colloidal particle is due to the selective adsorption of ions present in the dispersion medium. The adsorbed ion on the colloidal particles is responsible for the development of electric charge. For example, the selective adsorption of $$H^{+}$$ ions lead to the development of positive charge on the colloidal particles and the selective adsorption of $$OH^{-}$$ ions lead to the development of negative charge on the colloidal particles.

...view full instructions

Which of the following ion forms primary electrical double layer on the colloidal particle of $$As_{2}S_{3}$$?

A
$$As^{3-}$$

B
$$S^{2-}$$

C
$$H^{+}$$

D
$$OH^{-}$$

Solution
Question 10
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Which of the following is not true with respect to a catalyst?

A
A catalyst increases the rate of a reaction while inhibitor decreases the reaction rate.

B
A promoter cannot catalyse the reaction on its own without the presence of a catalyst.

C
The activity of enzyme catalyst increases in the presence of metal ions like $$Mn^{2+}$$, $$Co^{2+}$$, etc.

D
When a solid catalyst is used for gaseous reaction, energy released in physisorption increases the rate of a reaction.

Solution