Surface Chemistry Test

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Surface Chemistry Test - 61

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following absorbs carbon dioxide?

A
$$KOH$$

B
$$Ca{ Cl }_{ 2 }$$

C
$$Cu{ SO }_{ 4 }$$

D
All of the above
Question 2
1 / -0

Arrange the following diagrams in correct sequences of steps involved in the mechanism of catalyst, in accordance with modern adsorption theory.

A
$$I\rightarrow III\rightarrow II\rightarrow IV\rightarrow V$$

B
$$I\rightarrow II \rightarrow III\rightarrow V\rightarrow IV$$

C
$$I\rightarrow II\rightarrow III\rightarrow IV\rightarrow V$$

D
$$I\rightarrow III\rightarrow II\rightarrow V\rightarrow IV$$

Solution
Question 3
1 / -0

$$As_{2}O_{3}+3H_{2}S\rightarrow As_{2}S_{3}(sol)+3H_{2}O$$, the principle involved in the preparation of above coolloidal solution:

A
Oxidation

B
Reduction

C
Double displacement

D
Hydrolysis
Question 4
1 / -0

Which of the following is an example of heterogeneous catalysis?

A
Production of ammonia by Haber's process

B
Oxidation of $$SO_{2}$$ in to $$SO_{3}$$ during contact process

C
Method of obtaining methanol from water gas

D
All of the given

Solution

Hint: In Heterogeneous catalysis, the reactants and catalysts are in different phases.

Step 1: Heterogeneous Catalysis
Catalyst is a substance that affects the rate of a reaction (increasing and decreasing without changing its chemical nature) and after the reaction remains unchanged.
The process of affecting the rate of a reaction by using a catalyst is called Catalysis.
When the reactants (usually in the gas phase) and catalyst (usually in the solid phase) are in different phases, the process is called Heterogeneous catalysis.
The rate of heterogeneous catalysis is directly proportional to the surface area of the catalyst.

Step 2: Explanation
In, Option (A), In the production of ammonia by Haber's process-
$$N_2(g)+3H_2(g) \xrightarrow{Fe(s)}2NH3(g)$$
$$N_2$$ and $$H_2$$ reactants are in gaseous phase while $$Fe$$ is in solid phase.So, this reaction represents heterogeneous catalysis.

In Option (B), In the oxidation of $$SO_2$$ in to $$SO_3$$ during contact process
$$2SO_2(g) \xrightarrow{Pt(s)}2SO_3(g)$$
the reactant $$SO_2$$ and product $$SO_3$$ are in gaseous phase while Platinum is in solid phase.

In Option (C), In the method of obtaining $$methanol$$ from $$water\ gas$$ -
$$[CO + H_2](g) + H_2(g) \xrightarrow{ZnO + Cr_2O_3} CH_3OH(g)$$
Here also, the reactants are in gas phase and the catalyst are in solid phase.
So all the three options are correct as they all are the examples of heterogeneous catalysis.

Final Step: Correct answer - (D) All of the given.
Question 5
1 / -0

Which is not the correct statement for a catalyst ?

A
It does not alter $$E_{ a }\quad $$

B
The surface of a catalyst adsorbs reactants

C
Catalyst may form intermediates with reactants

D
Action of enzyme catalyst is always specific
Question 6
1 / -0

Rate of adsorption of gas is greater when pressure increased

A
For low range of pressure

B
For high range of pressure

C
For moderate range of pressure

D
For every range of pressure

Solution
Question 7
1 / -0

Which of the following is the emulsifying agent for both $$O/W$$ type and $$W/O$$ of emulsions

A
Soap

B
Graphite

C
Proteins

D
Both $$1$$ & $$2$$
Question 8
1 / -0

Which of the following statements is incorrect regarding physiosrption?

A
More easily liquefiable gases adsorb readily.

B
Under high pressure, it results into multimolecular layer on adsorbent surface.

C
Enthalpy of adsorption ( $$\triangle { H }_{ adsorption }$$ ) is low and positive.

D
It occurs because of Van der Waal's forces.
Question 9
1 / -0

What is relationship between

A
Diasteromer

B
Enantiomer

C
Conformer

D
None of these

Solution
Question 10
1 / -0

An example of a positively charged sol is:

A
$$CdS$$ sol

B
Starch sol

C
Haemoglobin

D
Gold sol