Surface Chemistry Test

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Surface Chemistry Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

Emulsions of polyvinyl acetate are used in:

A
polishes

B
latex paints

C
fire works

D
rayons

Solution

Polyvinyl acetate is most widely used water resin. This water-based emulsion is used as latex house paints and common household white glues. So the answer is option B.
Question 2
1 / -0

Physical adsorption is appreciable at:

A
higher temperature

B
lower temperature

C
room temperature

D
$$100^oC $$

Solution

Weak van der Waals' forces of attractions are present between the molecules of the adsorbate and the adsorbent in the physical adsorption .so it requires less energy for the accumulation of adsorbate on the adsorbent , hence physical adsorption occurs at low temperature.
Hence option B is correct.
Question 3
1 / -0

Which of the following reactions is an example for homogeneous catalysis :

A
$$2H_2O_2(l)\xrightarrow{MnO_2(s)} 2H_2O (l)+O_2(g)$$

B
$$2SO_2(g)+O_2(g)\xrightarrow{V_2O_5(s)} 2SO_3(g)$$

C
$$2CO(g) +O_2(g) \xrightarrow{NO(g)} 2CO_2(g)$$

D
$$H_2(g) +C_2H_4(g) \xrightarrow{Ni(s)} C_2H_6(g)$$

Solution

The reaction in which all the reactants products and catalyst are in same phase is called homogeneous catalysis reaction.
In the option C all the reactants, products and catalyst are in same gaseous phase.
Question 4
1 / -0

The homogeneous catalysts is shown by:

A
Haber's process, $${ N }_{ 2 }+3{ H }_{ 2 }\xrightarrow [ ]{ Fe } 2{ NH }_{ 3 }$$

B
Ostwald process, $$4{ NH }_{ 3 }+5{ O }_{ 2 }\xrightarrow [ ]{ Pt } 4NO+6{ H }_{ 2 }O$$

C
Contact process, $$\quad 2S{ O }_{ 2 }+{ O }_{ 2 }\xrightarrow [ ]{ V_{2}O_{5}} 2S{ O }_{ 3 }$$

D
$$2{ C }_{ 2 }{ H }_{ 5 }OH\xrightarrow [ ]{ { H }_{ 2 }{ SO }_{ 4 } } { C }_{ 2 }{ H }_{ 5 }-O-{ C }_{ 2 }{ H }_{ 5 }+{ H }_{ 2 }O$$

Solution

If the catalyst is present in the same phase as the reactants, it is called homogeneous catalyst and this type of catalysts is called homogeneous catalysis. For example:
$$2{ C }_{ 2 }{ H }_{ 5 }OH(aq)\xrightarrow [ ]{ { H }_{ 2 }{ SO }_{ 4 } } { C }_{ 2 }{ H }_{ 5 }-O-{ C }_{ 2 }{ H }_{ 5 }(aq)+{ H }_{ 2 }O(l)\quad $$
Here, both reactants and catalyst are present in the liquid phase.
Question 5
1 / -0

Platinised asbestos is used as a catalyst in, the manufacture of $$H_2SO_4$$. It is an example of:

A
homogeneous catalyst

B
heterogeneous catalyst

C
autocatalyst

D
induced catalyst

Solution

Platinised asbestos is a solid catalyst whereas the reactants $$SO_2$$ and $$O_2$$ and product $$SO_3$$ are in gas phase in the manufacture of sulfuric acid. So the above process is heterogeneous catalysis.

Hence option B is correct.
Question 6
1 / -0

TEL minimises the knocking effect when mixed with petrol. It acts as:

A
positive catalyst

B
negative catalyst

C
autocatalyst

D
induced catalyst

Solution

Tetraethyl lead is added to petrol as it increases the octane number of petrol and it will result in a decrease in knocking activity(negative catalyst) of engine piston.
Hence option $$B$$ is correct.
Question 7
1 / -0

Which one of the following statements is incorrect in the case of heterogeneous catalyst?

A
The catalyst lowers the energy of activation.

B
The catalyst actually forms a compound with the reactant.

C
The surface of the catalyst plays a very important role.

D
There is no change in the energy of activation.

Solution

The effect of catalyst is to increase speed of reaction by lowering the activation energy
As it affect forward and backward reaction equally hence it don't change any thermodynamical aspects of reaction.
Further catalyst don't take part in reaction so it don't change the final products.
Question 8
1 / -0

Which of the following acts as a negative catalyst?

A
Lead tetraethyl as antiknock compound

B
Glycerol in decomposition of $$H_2O_2$$

C
Ethanol in the oxidation of chloroform

D
All of the above

Solution

An Negative Catalyst is a substance that decreases the rate of a chemical reaction.
Lead tetraethyl as antiknock compound
Glycerol in decomposition of $$H_2O_2$$
Ethanol in the oxidation of chloroform
All are act as Negative catalyst.
Question 9
1 / -0

Protons accelerate the hydrolysis of esters. This is an example of a/an:

A
promoter

B
homogeneous catalyst

C
acid-base catalyst

D
autocatalyst

Solution

Hydrolysis of esters is catalyzed by protons.

The proton is the most efficient homogeneous catalyst ,because Water forms protons by the process of self-ionization of water.Acids accelerate (catalyze) the hydrolysis of esters:

$$CH_3CO_2CH_3 + H_2O\rightarrow CH_3CO_2H + CH_3OH$$
Question 10
1 / -0

The order of volume of gases $$NH_3, CO_2$$ and $$CH_4$$ adsorbed by one gram of charcoal at 298 K, is:

A
$$CH_4 > CO_2 > NH_3 $$

B
$$NH_3 > CH_4 > CO_2 $$

C
$$NH_3 > CO_2 > CH_4 $$

D
$$CO_2 > NH_ 3 > CH_4$$

Solution

Easily liquifiable gases absorb to a greater extent. Therefore, the order is given by:

$$NH_3 > CO_2 > CH_4$$, as $$NH_3$$ is easily liquifiable followed by $$CO_2$$ and $$CH_4$$ at the last.

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Surface Chemistry Test - 34

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Surface Chemistry Test - 34

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Question 1

polishes

latex paints

fire works

rayons

Solution

Question 2

higher temperature

lower temperature

room temperature

$$100^oC $$

Solution

Question 3

$$2H_2O_2(l)\xrightarrow{MnO_2(s)} 2H_2O (l)+O_2(g)$$

$$2SO_2(g)+O_2(g)\xrightarrow{V_2O_5(s)} 2SO_3(g)$$

$$2CO(g) +O_2(g) \xrightarrow{NO(g)} 2CO_2(g)$$

$$H_2(g) +C_2H_4(g) \xrightarrow{Ni(s)} C_2H_6(g)$$

Solution

Question 4

Haber's process, $${ N }_{ 2 }+3{ H }_{ 2 }\xrightarrow [ ]{ Fe } 2{ NH }_{ 3 }$$

Ostwald process, $$4{ NH }_{ 3 }+5{ O }_{ 2 }\xrightarrow [ ]{ Pt } 4NO+6{ H }_{ 2 }O$$

Contact process, $$\quad 2S{ O }_{ 2 }+{ O }_{ 2 }\xrightarrow [ ]{ V_{2}O_{5}} 2S{ O }_{ 3 }$$

$$2{ C }_{ 2 }{ H }_{ 5 }OH\xrightarrow [ ]{ { H }_{ 2 }{ SO }_{ 4 } } { C }_{ 2 }{ H }_{ 5 }-O-{ C }_{ 2 }{ H }_{ 5 }+{ H }_{ 2 }O$$

Solution

Question 5

homogeneous catalyst

heterogeneous catalyst

autocatalyst

induced catalyst

Solution

Question 6

positive catalyst

negative catalyst

autocatalyst

induced catalyst

Solution

Question 7

The catalyst lowers the energy of activation.

The catalyst actually forms a compound with the reactant.

The surface of the catalyst plays a very important role.

There is no change in the energy of activation.

Solution

Question 8

Lead tetraethyl as antiknock compound

Glycerol in decomposition of $$H_2O_2$$

Ethanol in the oxidation of chloroform

All of the above

Solution

Question 9

promoter

homogeneous catalyst

acid-base catalyst

autocatalyst

Solution

Question 10

$$CH_4 > CO_2 > NH_3 $$

$$NH_3 > CH_4 > CO_2 $$

$$NH_3 > CO_2 > CH_4 $$

$$CO_2 > NH_ 3 > CH_4$$

Solution

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