Surface Chemistry Test

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Surface Chemistry Test - 69

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Weekly Quiz Competition

Question 1
1 / -0

Colloidal solution cannot be obtained from two such substance which are

A
Insoluble in each other

B
In same physical state

C
In different physical state

D
None of these

Solution

None of the above option is wrong, as colloid is obtained from all of them.
Question 2
1 / -0

In a reversible reaction, a catalyst will affect the rate of

A
Forward reaction

B
Reverse reaction

C
Forward and reverse reaction

D
Neither (a) nor (b)

Solution

The role of a catalyst in a reversible reaction is to allow the equilibrium to be achieved quickly.
A catalyst increases the rate of forward and reverse reaction to an equal extent. However, it does not affect the value of the equilibrium constant.

Hence, the correct option is $C$
Question 3
1 / -0

Which of the following is used as a catalyst in the manufacture of toluene from benzene with $$CH_{3}Cl?$$

A
Ni

B
Anhydrous $$AlCl_{3}$$

C
Pd

D
Pt

Solution

$$ C_{6}H_{6}+CH_{3}Cl\xrightarrow[AlCl_{3}]{Anhydrous}C_{6}H_{5}CH_{3}+HCl $$

Anhydrous $$AlCl_{3}$$ is used as shown in the reaction above.
Question 4
1 / -0

The role of a catalyst in a reversible reaction is to

A
Increase the rate of forward reaction

B
Decrease the rate of backward reaction

C
Alter the equilibrium constant of the reaction

D
Allow the equilibrium to be achieved quickly

Solution

The role of a catalyst in a reversible reaction is to allow the equilibrium to be achieved quickly. A catalyst increases the rate of forward and reverse reaction to an equal extent. However, it does not affect the value of the equilibrium constant.
Question 5
1 / -0

The catalyst used in the lead chamber process of sulphuric acid manufacture is

A
Platinum

B
Oxide of nitrogen

C
Nickel

D
Vanadium compounds

Solution

The process of producing sulphuric acid by oxidising sulphur dioxide with moist air, using gaseous nitrogen oxides as catalysts, is known as Lead chamber process. This reaction takes place primarily in a series of large, box-like chambers of sheet lead.

$$ 2SO_{2}+O_{2}\ \overset{NO}{\rightarrow}\ 2SO_{3} $$
Question 6
1 / -0

In the following reaction the catalyst used is

A
$$Al_{2}O_{3}$$

B
$$Cr_{2}O_{3}$$

C
$$Cr_{2}O_{3}$$ and $$Al_{2}O_{3}$$

D
Zn dust

Solution
Question 7
1 / -0

Which of the following reactions leads to the formation of a substance in the colloidal state

A
$$ Cu+HgCl_{2}\rightarrow CuCl_{2}+Hg $$

B
$$ 2HNO_{3}+3H_{2}S\rightarrow 3S+4H_{2}O+2NO $$

C
$$ 2Mg+CO_{2}\rightarrow 2MgO+C $$

D
$$ Cu+CuCl_{2}\rightarrow Cu_{2}Cl_{2} $$

Solution

$$ 2HNO_{3}+3H_{2}S\rightarrow \underset{sol}{3S}+4H_{2}O+2NO_{2} $$

Sulphur sol contains large aggregates of sulphur molecules such that the size of aggregate come in colloidal range.
Question 8
1 / -0

$$\underset{Sucrose}{{C_{12}H_{22}O_{11}}+H_{2}O}+H_{2}O\overset{dil.\ H_{2}SO_{4}}{\longrightarrow}\underset{Fructose}{C_{6}H_{12}O_{6}(aq)}+\underset{Glucose}{C_{6}H_{12}O_{6}(aq)}$$

In this reaction, dilute $$H_{2}SO_{4}$$ is called

A
Homogeneous catalysis

B
Homogeneous catalyst

C
Homogeneous catalysis

D
Homogeneous catalyst

Solution

In this reaction, dilute $$H_{2}SO_{4}$$ is called homogeneous catalyst because reactant and catalyst are present in the same physical state i.e. aqueous phase and the reaction is called homogeneous catalysis.
Question 9
1 / -0

Which of the following catalyses the conversion of glucose into ethanol?

A
Zymase

B
Invertase

C
Maltase

D
Diastase

Solution

Zymase is the enzyme complex that catalyses the fermentation of sugar into ethanol and carbon dioxide. It occurs naturally in yeasts.

$$ \underset{Glucose}{C_{6}H_{12}O_{6}}\xrightarrow[enzyme]{Zymase}\underset{Ethanol}{2C_{2}H_{5}OH}+2CO_{2} $$
Question 10
1 / -0

When a catalyst is added to a system the

A
Value of equilibrium constant is decreased

B
The rate of forward reaction is increased and that of backward reaction is decreased

C
Equilibrium concentration are unchanged

D
Equilibrium concentration are increased

Solution

When a catalyst is added to a system the equilibrium concentration remains unchanged. Catalyst never changes the value of the equilibrium constant. It helps to attain the equilibrium faster.

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Surface Chemistry Test - 69

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Surface Chemistry Test - 69

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Question 1

Insoluble in each other

In same physical state

In different physical state

None of these

Solution

Question 2

Forward reaction

Reverse reaction

Forward and reverse reaction

Neither (a) nor (b)

Solution

Question 3

Ni

Anhydrous $$AlCl_{3}$$

Pd

Pt

Solution

Question 4

Increase the rate of forward reaction

Decrease the rate of backward reaction

Alter the equilibrium constant of the reaction

Allow the equilibrium to be achieved quickly

Solution

Question 5

Platinum

Oxide of nitrogen

Nickel

Vanadium compounds

Solution

Question 6

$$Al_{2}O_{3}$$

$$Cr_{2}O_{3}$$

$$Cr_{2}O_{3}$$ and $$Al_{2}O_{3}$$

Zn dust

Solution

Question 7

$$ Cu+HgCl_{2}\rightarrow CuCl_{2}+Hg $$

$$ 2HNO_{3}+3H_{2}S\rightarrow 3S+4H_{2}O+2NO $$

$$ 2Mg+CO_{2}\rightarrow 2MgO+C $$

$$ Cu+CuCl_{2}\rightarrow Cu_{2}Cl_{2} $$

Solution

Question 8

Homogeneous catalysis

Homogeneous catalyst

Homogeneous catalysis

Homogeneous catalyst

Solution

Question 9

Zymase

Invertase

Maltase

Diastase

Solution

Question 10

Value of equilibrium constant is decreased

The rate of forward reaction is increased and that of backward reaction is decreased

Equilibrium concentration are unchanged

Equilibrium concentration are increased

Solution

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