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Surface chemistry

Total questions: 97

Worksheet time: 51mins

Name
Class
Date
1.

Which of the following process does not occur at the interface of phases?

a)

crystallisation

b)

heterogenous catalysis

c)

homogeneous catalysis

d)

corrosion

2.

Which of the following interface cannot be obtained?

a)

liquid-liquid

b)

solid-liquid

c)

liquid-gas

d)

gas-gas

3.

Extent of physisorption of a gas increases with ___________.

a)

increase in temperature.

b)

decrease in temperature.

c)

decrease in surface area of adsorbent.

d)

decrease in strength of van der Waals forces.

4.

Extent of adsorption of adsorbate from solution phase increases with ________.

a)

increase in amount of adsorbate in solution.

b)

decrease in surface area of adsorbent.

c)

increase in temperature of solution.

d)

decrease in amount of adsorbate in solution.

5.

Which one of the following is not applicable to the phenomenon of adsorption?

a)

ΔH > 0

b)

ΔG < 0

c)

ΔS < 0

d)

ΔH < 0

6.

Physical adsorption of a gaseous species may change to chemical adsorption with ______________.

a)

decrease in temperature

b)

increase in temperature

c)

increase in surface area of adsorbent

d)

decrease in surface area of adsorbent

7.

In physisorption adsorbent does not show specificity for any particular gas because ______________.

a)

involved van der Waals forces are universal.

b)

gases involved behave like ideal gases.

c)

enthalpy of adsorption is low.

d)

it is a reversible process.

8.

At high concentration of soap in water, soap behaves as ____________.

a)

molecular colloid

b)

associated colloid

c)

macromolecular colloid

d)

lyophilic colloid

9.

Which of the following will show Tyndall effect?

a)

Aqueous solution of soap below critical micelle concentration.

b)

Aqueous solution of soap above critical micelle concentration.

c)

Aqueous solution of sodium chloride.

d)

Aqueous solution of sugar.

10.

Freshly prepared precipitate sometimes gets converted to colloidal solution by ___________.

a)

coagulation

b)

electrolysis

c)

diffusion

d)

peptisation

11.

A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as ____________.

a)

solid solution

b)

gel

c)

emulsion

d)

solution

12.

Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?

a)

Emulsification

b)

Colloid formation

c)

Coagulation

d)

Peptisation

13.

Which of the following process is not responsible for the presence of electric charge on the sol particles?

a)

Electron capture by sol particles.

b)

Adsorption of ionic species from solution.

c)

Formation of Helmholtz electrical double layer.

d)

Absorption of ionic species from solution

14.

At the equilibrium position in the process of adsorption ___________.

a)

ΔH > 0

b)

ΔH = TΔS

c)

ΔH > TΔS

d)

ΔH < TΔS

15.

Which one of the following is not applicable to the phenomenon of adsorption?

a)

ΔH > 0

b)

ΔG < 0

c)

ΔS < 0

d)

ΔH < 0

16.

In physisorption adsorbent does not show specificity for any particular gas because ______________.

a)

involved van der Waals forces are universal.

b)

gases involved behave like ideal gases.

c)

enthalpy of adsorption is low.

d)

it is a reversible process.

17.

At high concentration of soap in water, soap behaves as ____________.

a)

molecular colloid

b)

associated colloid

c)

macromolecular colloid

d)

lyophilic colloid

18.

Freshly prepared precipitate sometimes gets converted to colloidal solution by ___________.

a)

coagulation

b)

electrolysis

c)

diffusion

d)

peptisation

19.

Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ sol?

a)

 Na2SNa_2S  

b)

 Na3PO4Na_3PO_4  

c)

 Na2SO4Na_2SO_4  

d)

NaCl

20.

Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?

a)

Emulsification

b)

Colloid formation

c)

Coagulation

d)

Peptisation

21.

When dispersed phase is liquid and dispersion medium is gas, the colloidal system is called:

a)

Aerosol

b)

Emulsion

c)

Smoke

d)

Gel

22.

Peptization denotes:

a)

Digestion of food

b)

Hydrolysis of protein

c)

Breaking and dispersion into colloidal state

d)

Precipitation of solid from colloidal dimension

23.

'Greater the valency, the higher is the ciagulating power of ion'. This rule was introduced by

a)

Hardy Schulz

b)

Maxwell

c)

Kisses lewis

d)

Faraday

24.

(a)   is the device used for the treatment of smoke coming out of chimneys

25.

Temperature above which micelles formation takes place is called as

a)

Critical temperature

b)

Kraft temperature

c)

Freezing point

d)

None of these

26.

What is an emulsion?

a)

Solid in liquid colloidal sol.

b)

Solid in gas colloidal sol.

c)

Liquid in liquid colloidal sol.

d)

All of the above

27.

(a)   force is responsible for physisorption

28.

Adsorption is a................process

a)

Exothermic process

b)

Endothermic process

c)

Both

d)

None

29.

 In....................catalysis state of reactants and catalyst is different

a)

Homogeneous 

b)

Heterogeneous

c)

Both

d)

None

30.

The difference in potential of fixed and mobile layer is called (a)  

31.

Peptisation is a process of

a)

Precipitation of colloid

b)

Dispersion of precipitate

c)

purification of colloids

d)

Movement of colloid under electric potential

32.

Entropy during adsorption ...........

a)

Decreases

b)

Increases

c)

Remain Same

d)

Cannot say

33.

What kind of process is adsorption?

(a)  

34.

Extent of physisorption increases with

a)

decrease in surface area

b)

increase in temperature

c)

decrease in temperature

d)

decrease in strength of van der waal forces

35.

At high concentration of soap in water, soap behaves as

a)

multimolecular colloid

b)

macromolecular colloid

c)

associated colloid

d)

Solution

36.

The minimum temperature required for formation of associated colloid is called...........

a)

Critical temperature

b)

Inversion temperature

c)

Kraft temperature

d)

Boyle's temperature

37.

substance with diameter lying within (a)   nm range

38.

what is brownian movement?

a)

zigzag movement of colloids

b)

reflection of colloids

c)

dispersion of colloids

d)

adsorption of colloids

39.

how many types of solutions?

a)

1

b)

5

c)

3

d)

2

40.

size smaller than 1nm are called

a)

True solution

b)

colloidal solution

c)

suspension

d)

heterosolution

41.

Only allow electrolytes to pass through under the influence of pressure or suction pump.

a)

dialysis

b)

ultracentrifugation

c)

ultrafiltration

42.

Rubber plating and chrome tanning of leather are based on?

a)

electro-osmosis

b)

Tyndall effect

c)

electrophoresis

d)

brownian movement

43.

what is the dispersed phase and dispersion medium of aersol?

a)

gas, liquid

b)

liquid, liquid.

c)

liquid, solid.

d)

Gas, solid.

44.

Which of the following interface cannot be obtained?

a)

liquid-liquid

b)

solid-liquid

c)

liquid-gas

d)

gas-gas

45.

Which one of the following is not applicable to the phenomenon of adsorption?

a)

ΔH > 0

b)

ΔG < 0

c)

ΔS < 0

d)

ΔH < 0

46.

Which of the following is not a favourable condition for physical adsorption?

a)

high pressure

b)

negative ΔH

c)

higher critical temperature of adsorbate

d)

high temperature

47.

In physisorption adsorbent does not show specificity for any particular gas because ______________.

a)

involved van der Waals forces are universal.

b)

gases involved behave like ideal gases.

c)

enthalpy of adsorption is low.

d)

it is a reversible process.

48.

Which of the following is an example of absorption?

a)

Water on silica gel

b)

Water on calcium chloride

c)

Hydrogen on finely divided nickel

d)

Oxygen on metal surface

49.

At high concentration of soap in water, soap behaves as ____________.

a)

molecular colloid

b)

associated colloid

c)

macromolecular colloid

d)

lyophilic colloid

50.

Which gas is adsorbed strongly be charcoal

a)

CO

b)

N2

c)

H2

d)

O2

51.

Which plot is the adsorption isobar for chemisorption x is the amount of gas adsorbed on the mass m at temperature T at constant pressure?

a)
b)
c)
d)
52.

Chemisorption is

a)

multimolecular nature

b)

reversible

c)

often highly specific and directional

d)

not specific

53.

Adsorption is accompanied by

a)

decrease in entropy of the system

b)

decrease in enthalpy of the system

c)

TΔS for the process is negative

d)

all of the above

54.

Which one of the following is an example of adsorption?

a)

ammonia in contact with water

b)

anhydrous CaCl2 with water

c)

silica gel in contact with water vapours

d)

all of these

55.

Which of the following statements is incorrect regarding physisorption?

a)

It occurs because of van der Walls forces

b)

More easily liquefiable gases are adsorbed readily

c)

Under high pressure it results into multimolecular layer on adsorbent surface

d)

Enthalpy of adsorption (ΔHadsorption) is low and positive

56.

A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to

a)

n

b)

1/n

c)

log K

d)

- log K

57.

For a linear plot of log(x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct? (k and n are constants)

a)

1/n appears as the intercept

b)

Only 1/n appears as the slope

c)

log(1/n) appears as the intercept

d)

Both k and 1/n appear in the slope term

58.

A particular adsorption process has the following characteristics:

(i) It arises due to van der Waals forces and

(ii) it is reversible.

Identify the correct statement that describes the above adsorption process

a)

Adsorption is monolayer.

b)

Adsorption increases with increase in temperature

c)

Enthalpy of adsorption is greater than 100 kJ mol–1.

d)

Energy of activation is low.

59.

Which of the following interface cannot be obtained

a)

liquid-liquid

b)

solid-liquid(

c)

liquid-gas

d)

gas-gas

60.

Physical adsorption of a gaseous species may change to chemical adsorption with ______________

a)

decrease in temperature

b)

increase in temperature

c)

increase in surface area of adsorbent

d)

decrease in surface area of adsorbent

61.

Physical adsorption

a)

increases with increase in temperature

b)

decreases with increase in temperature

c)

occurs readily at high temperature

d)

none

62.

Lyophobic colloids are

a)

irreversible

b)

water loving

c)

solvent loving

d)

reversible

63.

Micelles are

a)

ideal solutions

b)

associated colloids

c)

adsorbed surfaces

d)

macromolecular colloids

64.

Physical adsorption of a gaseous species may change to chemical adsorption with ______________.

a)

decrease in temperature

b)

increase in temperature

c)

increase in surface area of adsorbent

d)

decrease in surface area of adsorbent

65.

At high concentration of soap in water, soap behaves as ____________.

a)

molecular colloid

b)

associated colloid

c)

macromolecular colloid

d)

lyophilic colloid

66.

In Freundlich adsorption isotherm x/m = Kp1/n, the value of ‘n’ at low pressure is

a)

more than one.

b)

less than one.

c)

equal to one.

d)

from zero to one.

67.

Which shape selective catalyst is used to convert alcohol to gasoline?

a)

Trpsin

b)

Calgon

c)

ZSM-5

d)

Zeigler-Natta catalyst

68.

At high concentration of soap in water, soap behaves as

a)

multimolecular colloid

b)

macromolecular colloid

c)

associated colloid

d)

Solution

69.

The minimum temperature required for formation of associated colloid is called...........

a)

Critical temperature

b)

Inversion temperature

c)

Kraft temperature

d)

Boyle's temperature

70.

If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is known as

a)

Emulsion

b)

Solid Sol

c)

Gel

d)

Sol

71.

At high concentration of soap in water, soap behaves as ____________.

a)

molecular colloid

b)

associated colloid

c)

macromolecular colloid

d)

lyophilic colloid

72.

Extent of adsorption of adsorbate from solution phase increases with……

a)

increase in amount of adsorbate in solution

b)

decrease in surface area of adsorbent

c)

increase in temperature of solution

d)

decrease in amount of adsorbate in solution

73.

Which shape selective catalyst is used to convert alcohol to gasoline?

a)

Trpsin

b)

Calgon

c)

ZSM-5

d)

Zeigler-Natta catalyst

74.

When a small amount of FeCl3 is added to a freshly precipitated Fe(OH)3, b reddish brown colloidal solution is obtained. This phenomenon is known as

a)

dialysis

b)

peptization

c)

protection

d)

dissolution

75.
Pure water has a
a)
Neutral pH 
b)
Negative pH
c)
Positive pH
d)
Both Negative and Positive pH
76.

Extent of physisorption of a gas increases with ___________.

a)

(i) increase in temperature.

b)

(ii) decrease in temperature.

c)

(iii) decrease in surface area of adsorbent.

d)

(iv) decrease in strength of van der Waals forces.

77.

Which of the following is not a favourable condition for physical adsorption?

a)

high pressure

b)

negative \Delta H

c)

higher critical temperature of adsorbate

d)

high temperature

78.

Which of the following is an example of absorption?

a)

Water on silica gel

b)

Water on calcium chloride

c)

Hydrogen on finely divided nickel

d)

Oxygen on metal surface

79.

θ is the ratio of the number of adsorption sites ----------- to the number of adsorption sites ---------------

a)

available, occupied

b)

occupied, available

c)

present, available

d)

present, empty

80.

It has been observed that ---------- gases are more adsorbed than ----------- gas.

a)

permanent gas, easily liquifiable gas

b)

temporary gas, permanent gas

c)

easily liquefiable gas, permanent gas

d)

permanent gas, temporary gas

81.

If the surface area per unit mass of the ------------- is greater, then greater is its -------------- capacity.

a)

adsorbate, adsorbent

b)

solid, storage

c)

adsorbate, surface area

d)

adsorbent, adsorption

82.

The extent of adsorption i.e. (x/m), where x is the mass of the adsorbate and m is the mass of the adsorbent, depends on the ------------------.

a)

pressure

b)

temperature

c)

volume

d)

area

83.

An adsorption isotherm is a graph plotted between magnitude of ----------- and -----------------.

a)

pressure and temperature

b)

temperature, surface area

c)

adsorption, pressure

d)

absorption and adsorption

84.

In Freundlich adsorption isotherm, at saturation pressure, the rate of adsorption becomes equal to the rate of -------------.

a)

absorption

b)

sorption

c)

desorption

d)

activation

85.

Which is a MAJOR cause of acid rain?

a)

spraying pesticides on crops

b)

burning fossil fuels for energy

c)

dumping sewage in rivers

d)

using Nuclear power stations

86.

Which is NOT caused by acid rain?

a)

damage to statues

b)

dying fish

c)

spread of disease

d)

weakened trees

87.

Acid rain has a pH LESS than

a)

6

b)

7

c)

8

d)

3

88.

Which of the following statements are true for pure substances? Select any 2 options.

a)

pure substances contain only one kind of particles

b)

pure substances may be compound or mixtures

c)

pure substances have the same composition throughout

d)

Pure substance can be exemplified by all elements other than nickel

89.

Tincture of iodine has antiseptic properties. this solution is made by dissolving

a)

iodine in benzene

b)

iodine in water

c)

iodine in alcohol

d)

iodine in ether

90.

Name the effect

a)

brownian

b)

tyndall

c)

suspension

d)

colloidal

91.

NAME THE MOTION AND WHICH TYPE OF PARTICLES SHOW THIS MOTION.

a)

BROWNIAN , COLLOIDS

b)

BROWNIAN, SUSPENSIONS

c)

BROWNIAN, TRUE SOLUTIONS

92.

NAME THE CHANGE

a)

PHYSICAL CHANGE

b)

CHEMICAL CHANGE

93.

Which substance is MOST soluble at 0 ºC?

a)

KCI

b)

NaNO3

c)

NaCl

d)

Ce2(SO4)3

94.
Sugar water let's light pass through, and is a homogeneous mixture
a)
solution
b)
suspension
c)
colloid
95.

The Tyndall Effect is not visible in which of the following?

a)

Solution

b)

Suspension

c)

Colloid

d)

Heterogeneous Mixture

96.

The beaker on the left would be a (both have been recently stirred)

a)

Solution

b)

Suspension

c)

Colloid

d)

Impossible to tell

97.

Which one is not a colloid

a)

Foam

b)

Gel

c)

Emulsion

d)

Coffee

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