Surface Chemistry Test

Question 1

1 / -0

Match the column I with column II and mark the appropriate choice.

Column I	Column II
(A) Water loving colloids	(i) Irreversible
(B) Liquid dispersed in gas	(ii) Emulsifying agent
(C) Hydrophobic	(iii) Hydrophilic
(D) Soap	(iv) Aerosol
(E) Micelles	(v) Coagulation
(F) Hardy-Schulze rule	(vi) Associated colloids

(A) $$\rightarrow$$ (iii), (B) $$\rightarrow$$ (iv), (C) $$\rightarrow$$ (i), (D) $$\rightarrow$$ (ii), (E)$$\rightarrow$$(vi),(F)$$\rightarrow$$(v)

(A) $$\rightarrow$$ (i), (B) $$\rightarrow$$ (vi), (C) $$\rightarrow$$(v), (D) $$\rightarrow$$ (iii), (E)$$\rightarrow$$(iv),(F)$$\rightarrow$$(ii)

(A) $$\rightarrow$$ (vi), (B) $$\rightarrow$$ (iv), (C) $$\rightarrow$$(v), (D) $$\rightarrow$$(ii), (E)$$\rightarrow$$(iii),(F)$$\rightarrow$$(i)

(A) $$\rightarrow$$ (ii), (B) $$\rightarrow$$(iii), (C) $$\rightarrow$$ (iv), (D) $$\rightarrow$$ (v), (E)$$\rightarrow$$(vi),(F)$$\rightarrow$$(i)

Question 2
1 / -0

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

A
Crystallisation

B
Heterogeneous catalysis

C
Homogeneous catalysis

D
Corrosion

Question 3
1 / -0

The term 'sorption' stands for:

A
absorption

B
adsorption

C
both absorption and adsorption

D
desorption

Question 4
1 / -0

Which of the following interfaces cannot be obtained?

A
Liquid-Liquid

B
Solid-Liquid

C
Liquid-Gas

D
Gas-Gas

Question 5
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Which one of the following is not applicable to the phenomenon of adsorption?

A
$$\Delta H>0$$

B
$$\Delta G<0$$

C
$$\Delta S<0$$

D
$$\Delta H<0$$

Question 6
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At the equilibrium position in the process of adsorption_________.

A
$$\Delta H>0$$

B
$$\Delta H=T\Delta S$$

C
$$\Delta H>T \Delta S$$

D
$$\Delta H=0$$

Question 7
1 / -0

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

Question 8
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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

Question 9
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Which of the following statements are correct?
(i) When an animal hide, which has negatively charged particles, is soaked in tannin, which contains positively charged colloidal particles, mutual coagulation does not take place.
(ii) Photographic films are prepared by coating an emulsion of the light sensitive silver bromide in gelatin over glass plates or celluloid films.
(iii) Latex is a colloidal solution of rubber particles which are negatively charged.
(iv) In Cottrell precipitator, the smoke, before it comes out from the chimney, is led through a chamber containing plates having a charge opposite to that carried by smoke particles. The particles on coming in contact with these plates acquire some charge and do not get precipitated.

A
(i) and (iv) only

B
(ii) and (iii) only

C
(ii), (iii) and (iv) only

D
All of these.

Question 10
1 / -0

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

Submit Test

Surface Chemist...

Question 1

(A) $$\rightarrow$$ (iii), (B) $$\rightarrow$$ (iv), (C) $$\rightarrow$$ (i), (D) $$\rightarrow$$ (ii), (E)$$\rightarrow$$(vi),(F)$$\rightarrow$$(v)

(A) $$\rightarrow$$ (i), (B) $$\rightarrow$$ (vi), (C) $$\rightarrow$$(v), (D) $$\rightarrow$$ (iii), (E)$$\rightarrow$$(iv),(F)$$\rightarrow$$(ii)

(A) $$\rightarrow$$ (vi), (B) $$\rightarrow$$ (iv), (C) $$\rightarrow$$(v), (D) $$\rightarrow$$(ii), (E)$$\rightarrow$$(iii),(F)$$\rightarrow$$(i)

(A) $$\rightarrow$$ (ii), (B) $$\rightarrow$$(iii), (C) $$\rightarrow$$ (iv), (D) $$\rightarrow$$ (v), (E)$$\rightarrow$$(vi),(F)$$\rightarrow$$(i)

Question 2

Crystallisation

Heterogeneous catalysis

Homogeneous catalysis

Corrosion

Question 3

absorption

adsorption

both absorption and adsorption

desorption

Question 4

Liquid-Liquid

Solid-Liquid

Liquid-Gas

Gas-Gas

Question 5

$$\Delta H>0$$

$$\Delta G<0$$

$$\Delta S<0$$

$$\Delta H<0$$

Question 6

$$\Delta H>0$$

$$\Delta H=T\Delta S$$

$$\Delta H>T \Delta S$$

$$\Delta H=0$$

Question 7

involved van der waals forces are universal

gases involved behave like ideal gases

enthalpy of adsorption is low

it is a reversible process

Question 8

High pressure

Negative $$\Delta H$$

Higher critical temperature of adsorbate

High temperature

Question 9

(i) and (iv) only

(ii) and (iii) only

(ii), (iii) and (iv) only

All of these.

Question 10

increase in temperature

decrease in temperature

decrease in surface area of adsorbent

decrease in strength of van der Waals forces

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