Surface Chemistry Test

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Surface Chemistry Test - 73

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Weekly Quiz Competition

Question 1
1 / -0

Animal charcoal is used in decolourising colour of liquids because it is a good_________

A
Adsorbate

B
Adsorbent

C
Oxidising agent

D
Reducing agent

Solution

Animal charcoal is a good adsorbate. The impurities adsorbs on its surface and thus it decolourises colour of liquids.
Question 2
1 / -0

Which of the following colloids are formed when hydrogen sulphide gas is passed through a cold solution of arsenious oxide?

A
$$ As_{2}S_{3} $$

B
$$ As_{2}O_{3} $$

C
$$ As_{2}S $$

D
$$ As_{2}H_{2} $$

Solution

It is due to adsorption of $$ S^{2-} $$ ions on the surface of the colloidal particles and $$ H^{+} $$ ions in the diffused layer.

Option A is correct.
Question 3
1 / -0

Which of the following is not an emulsion?

A
Butter

B
Ice cream

C
Milk

D
Cloud

Solution

It is liquid in gas colloidal solution and others are emulsions.

Option D is correct.
Question 4
1 / -0

Two percent of ethanol is added during the oxidation of chloroform to stop the formation of carbonyl chloride. In this reaction ethanol acts as

A
Auto catalyst

B
Negative catalyst

C
Positive catalyst

D
None of thewse

Solution

Any substance which when added to a chemical reaction inhibit or decrease the rate of reaction is called negative catalyst. In $$CHCl_3$$ when two percent ethanol is added , it stops the formation of carbonyl chloride. So ethanol acts as negative catalyst.
Question 5
1 / -0

An emulsifier is a substance which____________

A
stabilises the emulsion

B
homogenises the emulsion

C
coagulates the emulsion

D
retards the dispersion of liquid in liquid

Solution

For the stabilisation of an emulsion a third component called emulsifying agent is usually added. The emulsifier forms an interfacial film between suspended particles and the medium.
Question 6
1 / -0

Hydrophilic sols are________

A
Reversible

B
Irreversible

C
Unstable

D
None of these

Solution

An important characteristic of these sols is that if the dispersion medium is separated from the dispersed phase (say by evaporation), the sol can be reconstituted by simply remixing with the dispersion medium. That is why these sols are also called reversible sols.
Question 7
1 / -0

Cod liver oil is

A
An emulsion

B
Solution

C
Colloidal solution

D
Suspension

Solution

A colloid of liquid in liquid is called emulsion. Cod liver oil is such an emulsion.
Question 8
1 / -0

Reagent (C) is:

A
$$Me_2Cd$$

B
$$Me_2CuLi$$

C
$$CH_3I$$

D
$$Me_2SO_4 + NaOH$$

Solution

Hence, Option "B" is the correct answer.
Question 9
1 / -0

Catalyst used in dimerisation of acetylene to prepare chloroprene is

A
$$HgSO_{4} + H_{2}SO_{4}$$

B
$$Cu_{2}Cl_{2}$$

C
$$Cu_{2}Cl_{2} + NH_{4}Cl$$

D
$$Cu_{2}Cl_{2} + NH_{4}OH$$

Solution

Acetylene dimerized to give vinyl acetylene when it combines with hydrogen chloride to form 4-chloro-1, 2-butadiene, an allene derivative, which in presence of cuprous chloride ($$Cu_2Cl_2$$) and ammonium chloride ($$NH_4Cl$$), rearranges to form $$\text{2- Chlorobuta-1 , 3-diene}$$.
Question 10
1 / -0

In which of the following reactions heterogeneous catalysis is involved?

(a) $$2 SO_{2}(g)+O_{2}(g) \quad \stackrel{NO(g)}{\longrightarrow} 2 SO_{3}(g)$$

(b) $$2 S
O_{2}(g) \stackrel{Pt(s)}{\longleftarrow} 2 S O_{3}(g)$$

(c) $$N_{2}(g)+3
H_{2}(g\stackrel{Fe(s)}{\longrightarrow} 2 N H_{3}(g)$$

(d) $$C
H_{3} C O O C H_{3}(l)+H_{2} O(l) \stackrel{H Cl}{\longrightarrow} C H_{3} C O
O H(a q)+C H_{3} O H(a q)$$

A
(b),(c)

B
(b),(c),(d)

C
(a), (b), (c)

D
(d)

Solution

When the reactant and catalyst are in different phase it is known as heterogeneous catalysis.

Hence, Option "A" is the correct answer.

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Re-Attempt Weekly Quiz Competition

Surface Chemistry Test - 73

Result

Surface Chemistry Test - 73

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Question 1

Adsorbate

Adsorbent

Oxidising agent

Reducing agent

Solution

Question 2

$$ As_{2}S_{3} $$

$$ As_{2}O_{3} $$

$$ As_{2}S $$

$$ As_{2}H_{2} $$

Solution

Question 3

Butter

Ice cream

Milk

Cloud

Solution

Question 4

Auto catalyst

Negative catalyst

Positive catalyst

None of thewse

Solution

Question 5

stabilises the emulsion

homogenises the emulsion

coagulates the emulsion

retards the dispersion of liquid in liquid

Solution

Question 6

Reversible

Irreversible

Unstable

None of these

Solution

Question 7

An emulsion

Solution

Colloidal solution

Suspension

Solution

Question 8

$$Me_2Cd$$

$$Me_2CuLi$$

$$CH_3I$$

$$Me_2SO_4 + NaOH$$

Solution

Question 9

$$HgSO_{4} + H_{2}SO_{4}$$

$$Cu_{2}Cl_{2}$$

$$Cu_{2}Cl_{2} + NH_{4}Cl$$

$$Cu_{2}Cl_{2} + NH_{4}OH$$

Solution

Question 10

(b),(c)

(b),(c),(d)

(a), (b), (c)

(d)

Solution

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