#### 12th Standard Chemistry Surface Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021

12th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20
20 x 1 = 20
1. For Freundlich isotherm a graph of log $\frac{x}{m}$ is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to

(a)

$\frac{1}{n}$ ,K

(b)

log$\frac{1}{n}$ ,K

(c)

$\frac{1}{n}$ ,logK

(d)

log $\frac{1}{n}$ ,log K

2. Which one of the following characteristics are associated with adsorption?

(a)

$\Delta$G and $\Delta$H are negative but $\Delta$S is positive

(b)

$\Delta$G and $\Delta$S are negative but $\Delta$H is positive

(c)

$\Delta$G is negative but $\Delta$H and $\Delta$S are positive

(d)

$\Delta$G,$\Delta$H and $\Delta$S all are negative.

3. Hair cream is

(a)

gel

(b)

emulsion

(c)

solid sol

(d)

sol.

4. The most effective electrolyte for the coagulation of AS2S3Sol is

(a)

NaCl

(b)

Ba(NO3)2

(c)

K3[Fe(CN)6]

(d)

Al3+

5. The phenomenon observed when a beam of light is passed through a colloidal solution is

(a)

Cataphoresis

(b)

Electrophoresis

(c)

Coagulation

(d)

Tyndall effect

6. Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?

(a)

Nitroglycerine

(b)

Cellulose acetate

(c)

Glycoldinitrate

(d)

Nitrocellulose

7. Adsorption of a gas on solid metal surface is spontaneous and exothermic, then

(a)

ΔH increases

(b)

ΔS increases

(c)

ΔG increases

(d)

ΔS decreases

8. Which among the following true regarding adsorption?
(i) Adsorption is a spontaneous process
(ii) Adsorption is always accompanied by increase in free energy.
(iii) Adsorption is an endothermic process
(iv) Adsorption can occur in all interfacial surfaces.

(a)

only (ii)

(b)

(ii) and (iii)

(c)

only (i)

(d)

(i) and (iv)

9. According to Freundlich adsorption isotherm,

(a)

$\frac { x }{ m } =kp$

(b)

$\frac { m }{ x } ={ (kp) }^{ \frac { 1 }{ n } }$

(c)

$\frac { x }{ m } ={ kp }^{ \frac { 1 }{ n } }$

(d)

$\\ \\ \frac { x }{ m } =\frac { k }{ { p }^{ \frac { 1 }{ n } } }$

10. Which of the following interface cannot be obtained?

(a)

solid - solid

(b)

solid - liquid

(c)

gas - gas

(d)

liquid -Iiquid

11. Auto catalysis is observed in the reaction given below.
CH3COOC2H5+H2O➝ CH3COOH+C2H5OH

(a)

CH3COOC2H5

(b)

H2O

(c)

CH3COOH

(d)

C2H5OH

12. Fog is a colloidal solution of

(a)

gas in liquid

(b)

liquid in gas

(c)

gas in solid

(d)

solid in gas

13. Which one of the following does not involve coagulation?

(a)

formation of delta

(b)

peptisation

(c)

clotting of blood

(d)

tanning of leather

14. The place where rivers meet the sea is the delta region. Which of the following process is responsible for the formation of delta?

(a)

Emulsification

(b)

Peptisation

(c)

Gel formation

(d)

Coagulation

15. Colloidal milk of magnesia is used

(a)

as germ killer

(b)

as fertilizer

(c)

for stomach disorders

(d)

as tonic

16. Extent of physisorption of a gas increases with_______

(a)

increase in temperature

(b)

decrease in surface area of adsorbent

(c)

decrease in pressure

(d)

decrease in temperature

17. Butter and cream are examples of________type of emulsion.

(a)

O/O

(b)

O/W

(c)

W/W

(d)

W/O

18. The process of hardening of leather is called

(a)

coagulation

(b)

tanning

(c)

centrifuging

(d)

stabilization

19. The function of FeCl3 in the conversion of Fe(OH)3 precipitate into a colloid is_________

(a)

peptising agent

(b)

emulsifying agent

(c)

reducing agent

(d)

precipitating agent

20. Silica gel is utilised for the ________of the number of gases.

(a)

(b)

absorption

(c)

desorption

(d)

all of these