Surface Chemistry Test

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Surface Chemistry Test - 29

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is an example for heterogeneous catalysis reaction?

A
$$2S{ O }_{ 2 }\left( g \right) +{ O }_{ 2 }\left( g \right) \underrightarrow { \quad \quad NO\left( g \right) \quad \quad } 2S{ O }_{ 3 }\left( g \right) $$

B
Hydrolysis of aqueous sucrose solution in the presence of a aqueous mineral acid

C
$$2{ H }_{ 2 }{ O }_{ 2 }\left( l \right) \underrightarrow { \quad \quad Pt\left( s \right) \quad \quad } 2{ H }_{ 2 }O\left( l \right) +{ O }_{ 2 }\left( g \right) $$

D
Hydrolysis of liquid in the presence of aqueous mineral acid

Solution

Heterogeneous catalysis is the type of catalysis where the phase of the catalyst differs from the phase of the reactants or products.

It is an example of heterogeneous catalysis reaction.
$$\displaystyle 2{ H }_{ 2 }{ O }_{ 2 }\left( l \right) \xrightarrow{Pt(s)} 2{ H }_{ 2 }O\left( l \right) +{ O }_{ 2 }\left( g \right)$$

In this reaction, the reactant is in the liquid phase, the catalyst is in the solid phase and the products are in liquid and gas phase.

But in homogeneous catalysis, the reactants, products and catalyst are in one phase. For example, the reactions of the options (A), (B) and (D).

Hence, option C is correct.
Question 2
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Which of the following sol is not prepared using Bredig's arc method?

A
Silver sol

B
Copper sol

C
Gold sol

D
Platinum sol

Solution

Bredig's arc method is a method of preparation of the colidal solution of metals such as silver, gold, platinum etc. Copper sol is not prepared using Bredig's arc method
Question 3
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The peptizing agent used in Peptization is a/an:

A
stabilizer

B
electrolyte

C
proton donor

D
promoter

Solution

Peptization is the process responsible for the formation of stable dispersion of colloidal particles in dispersion medium. In other words it may be defined as a process of converting a precipitate into colloidal sol by shaking it with dispersion medium in the presence of small amount of electrolyte. The electrolyte used in this process is called as peptizing agent.
Question 4
1 / -0

In Bredig's Arc method,the stabilizer used is:

A
$$Ca(OH)_2$$

B
$$CaO$$

C
$$KOH$$

D
$$K_2O$$

Solution

Bredig's arc method consists of both dispersion and condensation. An arc is struck between electrodes, under the surface of water containing stabilising agents such as $$KOH$$. The intense heat of the arc vaporizes some of the metal which then condenses under cold water.
Question 5
1 / -0

Collodion is a:

A
colloidal sol of cellulose nitrate in water

B
colloidal sol of cellulose acetate in ethyl alcohol

C
colloidal sol of cellulose nitrate in ethyl alcohol

D
colloidal sol of cellulose acetate in water

Solution

Collodion is a colloidal sol of cellulose nitrate in ethyl alcohol.
Question 6
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Which of the following is NOT a condensation method?

A
solvent exchange method

B
physical state change method

C
peptization

D
chemical methods
Question 7
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Which on adding to freshly precipitated aluminium hydroxide and shaking produces sol of aluminium hydroxide?

A
insufficient quantity of conc $$HCl$$

B
sufficient quantity of conc $$HCl$$

C
insufficient quantity of very dil $$HCl$$

D
sufficient quantity of very dil $$HCl$$

Solution

On adding insufficient quantity of very dilute HCl solution to the freshly precipitated aluminium hydroxide, a sol of aluminium hydroxide is obtained.
When small amount of very dilute solution of HCl is added to freshly precipitated aluminium hydroxid (Al(OH)3, a colloidal solution of Al(OH)3 is obtained.
Question 8
1 / -0

The stabilizer used in the preparation of colloidal sol of mercury and sulphur is:

A
an ammonium salt

B
a citrate

C
$$KOH$$

D
both A and B

Solution

A colloidal solution of certain elements such as mercury and sulphur are obtained by passing their vapours through cold water containing a stabilizer ( an ammonium salt or a citrate).

Hence, the correct option is $$D$$
Question 9
1 / -0

Soaps do not create water pollution because:

A
soaps are insoluble in water

B
soaps are soluble in water

C
soaps are fairly bio-degradable

D
soaps are non-biodegradable

Solution

Soaps do not create water pollution because they are biodegradable. Biodegradable are the substances that can be decomposed by bacteria and thereby avoiding pollution.
Question 10
1 / -0

An emulsion is a colloidal solution of:

A
two solids

B
two liquids

C
two gases

D
one solid and liquid

Solution

An emulsion is a colloidal solution of two liquids, one of which is an oil and the other one is water. For example, milk is an emulsion. It is colloidal solution of liquid fat in water. Based on which solution is dispersed phase and which solution is dispersion medium, an emulsion is classified into oil in water type emulsion and water in oil type emulsion.

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Surface Chemistry Test - 29

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Surface Chemistry Test - 29

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Question 1

$$2S{ O }_{ 2 }\left( g \right) +{ O }_{ 2 }\left( g \right) \underrightarrow { \quad \quad NO\left( g \right) \quad \quad } 2S{ O }_{ 3 }\left( g \right) $$

Hydrolysis of aqueous sucrose solution in the presence of a aqueous mineral acid

$$2{ H }_{ 2 }{ O }_{ 2 }\left( l \right) \underrightarrow { \quad \quad Pt\left( s \right) \quad \quad } 2{ H }_{ 2 }O\left( l \right) +{ O }_{ 2 }\left( g \right) $$

Hydrolysis of liquid in the presence of aqueous mineral acid

Solution

Question 2

Silver sol

Copper sol

Gold sol

Platinum sol

Solution

Question 3

stabilizer

electrolyte

proton donor

promoter

Solution

Question 4

$$Ca(OH)_2$$

$$CaO$$

$$KOH$$

$$K_2O$$

Solution

Question 5

colloidal sol of cellulose nitrate in water

colloidal sol of cellulose acetate in ethyl alcohol

colloidal sol of cellulose nitrate in ethyl alcohol

colloidal sol of cellulose acetate in water

Solution

Question 6

solvent exchange method

physical state change method

peptization

chemical methods

Question 7

insufficient quantity of conc $$HCl$$

sufficient quantity of conc $$HCl$$

insufficient quantity of very dil $$HCl$$

sufficient quantity of very dil $$HCl$$

Solution

Question 8

an ammonium salt

a citrate

$$KOH$$

both A and B

Solution

Question 9

soaps are insoluble in water

soaps are soluble in water

soaps are fairly bio-degradable

soaps are non-biodegradable

Solution

Question 10

two solids

two liquids

two gases

one solid and liquid

Solution

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