Surface Chemistry Test

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Surface Chemistry Test - 46

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Weekly Quiz Competition

Question 1
1 / -0

Peptization is:

A
Formation of colloid from precipitate

B
Formation of precipitate from colloid

C
Formation of colloid from solution

D
Addition of colloid is solvent.

Solution

formation of colloid from fresh precipitate with help of suitable electrolyte (peptising agent) is called Peptization.
Question 2
1 / -0

Following is the variation of physical adsorption with temperature.

A

B

C

D

Solution

Rate of physical adsorption gradually decreases with increase the temperature
Question 3
1 / -0

Solid acts as an adsorbent because it has

A
A definite shape

B
Small pores in it

C
Unsaturated valencies

D
A high lattice energy

Solution

Solid acts as a adsorbent because of unsaturated valencies. Activated charcoal is a great adsorbent because of it's huge surface area. While it doesn't bind very many ions/atoms/molecules per surface area (which is the characteristic of a 'good' adsorbent), due to very big surface area per unit of mass it can adsorb a lot of particles.
Question 4
1 / -0

A chemical reaction is catalyzed by a catalyst X . Hence X

A
Reduces enthalpy of the reaction

B
Decrease rate constant of the reaction

C
Increases activation energy of the reaction

D
Does not affect equilibrium constant of reaction

Solution

Since a catalyst affects equally both forward and backward reactions, therefore it does not affect equilibrium constant of reaction.
Hence D is correct answer
Question 5
1 / -0

Lindlar's catalyst is:

A
$$Pt$$ in ethanol

B
$$Pd + BaSO_{4}$$

C
$$Ni$$ in ethanol

D
$$Na$$ in liquid $$NH_{3}$$

Solution
Question 6
1 / -0

The dispersed phase in colloidal iron(III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statement(s) is/are not correct?

A
Magnesium chloride solution coagulates the gold sol more readily than the iron(III) hydroxide sol.

B
Sodium sulphate solution causes coagulation in both sols.

C
Mixing of the sols has no effect.

D
Coagulation in both sols can be brought about by electrophoresis.
Question 7
1 / -0

Sticking of one substance at the surface of another is called

A
Absorption

B
Chemisorption

C
Adsorption

D
Desorption

Solution

Sticking of one substance at the surface of another is called Adsorption.
Question 8
1 / -0

Adsorption is multilayer in the case of

A
Physical adsorption

B
Chemisorption

C
Both

D
None of both

Solution

Adsorption is multilayer in case of physical adsorption. However, in the case of chemisorption, the absorption is unilayer as it involves the formation of a chemical bond between adsorbate and adsorbent molecules. Hence, option A is correct.
Question 9
1 / -0

Which of the following is an emulsifier?

A
Soap

B
Water

C
Oil

D
NaCl

Solution

The presence of soap in a mixture of oil/grease and water will create an emulsion upon agitation. The hydrocarbon tails of soap dissolves in the oil and promotes droplet formation. These droplets repel each other, as they have the same net negative charge. These individual droplets can be dissolved in water as they form ion-dipole interactions. Therefore, Soap is an emulsifier.
Question 10
1 / -0

Sodium sterate forms in water

A
True solution

B
A suspencion

C
An emulsion

D
A colloidal solution

Solution

Sodium stearate is the sodium salt of stearic acid. This white solid is the most common soap. It is found in many types of solid deodorants, rubbers, latex paints, and inks.

Thus it forms a colloid.