BSEB 12th Chemistry Important Objective Question on Latest Pattern Surface Chemistry Chapter
5. SURFACE CHEMISTRY
1. Tyndall effect is not found is :
(A) sugar solution
(B) colloidal solution of gold
(C) suspension
(D) emulsion
| Answer :- (A) |
2. Chemical adsorption reaction is :
(A) reversible
(B) irreversible
(C) polymerisation
(D) none of these
| Answer :- (A) |
3. Volume of one mole of any gas at NTP is :
(A) 11.2 litre
(B) 22.4 litre
(C) 10.2 litre
(D) 22.8 litre
| Answer :- (B) |
4. Tyndall effect confirms the :
(A) gravity effect on the sol particles
(B) light scattering by the sol particles
(C) heterogeneous nature of sols
(D) Brownian motion of the sol particles
| Answer :- (C) |
5. Which one of the following is a lyophilic colloid ?
(A) Milk
(B) Gum
(C) Fog
(D) Blood
| Answer :- (B) |
6. Shape-selective catalysis is a reaction catalysed by
(A) zeolite
(B) enzymes
(C) platinum
(D) Ziegler-Natta catalyst
| Answer :- (A) |
7. Which of the following types of metals make the most efficient catalyst ?
(A) Alkali metals
(B) Transition metals
(C) Inner transition metals
(D) Alkaline earth metals
| Answer :- (B) |
8. The oxide of nitrogen which acts as a catalyst in lead chamber process is :
(A) NO
(B) NO2
(C) N2O4
(D) H2O5
| Answer :- (A) |
9. The activity of an enzyme becomes ineffective
(A) at low temperature
(B) at atmospheric pressure
(C) at high temperature
(D) in aqueous medium
| Answer :- (C) |
10. Which of the following will not form a colloidal system :
(A) Solid gas
(B) Liquid-gas
(C) Gas-gas
(D) Gas-liquid
| Answer :- (C) |
11. Fog is an example of colloidal system of:
(A) liquid in gas
(B) gas in liquid
(C) solid in gas
(D) gas in solid
| Answer :- (A) |
12. Which of the following acts as the best coagulating agent for ferric hydroxide sol ?
(A) Potassium ferrocyanide
(B) Potassium chloride
(C) Potassium oxalate
(D) Aluminium chloride
| Answer :- (A) |
13. The formation of micelles takes place only above
(A) critical temperature
(B) Kraft temperature
(C) inversion temperature
(D) absolute temperature
| Answer :- (B) |
14. The size of colloidal particles ranges between
(A) 10-7 – 10-8 cm
(B) 10-9 – 10-11 cm
(C) 10-4 – 10-7 cm
(D) 10-2 – 10-3 cm
| Answer :- (C) |
15. Tyndall effect can be observed in a :-
(A) solvent
(B) precipitate
(C) colloidal solution
(D) solution
| Answer :- (C) |
16. At high concentration of soap in water, soap behaves as ……..
(A) molecular colloid
(B) associated colloid
(C) macromolecular colloid
(D) lyophilic colloid
| Answer :- (B) |
17. Freshly prepared precipitate sometimes gets converted to colloidal solution by …….
(A) coagulation
(B) electrolysis
(C) diffusion
(D) peptisation
| Answer :- (D) |
18. 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
| Answer :- (C) |
19. A catalyst is a substance which :
(A) Increases the equilibrium concentration of the product
(B) Changes the equilibrium constant of the reaction
(C) Shoftens the time to reach equilibrium
(D) Supplies energy to the reaction
| Answer :- (C) |
20. Which of the following is an example of solid-solid system?
(A) Smoke
(B) Cake
(C) Synthetic gems
(D) Pumice stone
| Answer :- (C) |
21. P2O2 is a good :
(A) Absorbend
(B) Absorbent
(C) Reducing agent
(D) Bleaching of colour
| Answer :- (B) |
22. Which gas is absorbed strongly by charcoal ?
(A) CO2
(B) NH3
(C) NCl3
(D) H2
| Answer :- (A) |
23. Which of the following gives yellow or brown precipitate with alkaline Nessler’s reagent?
(A) CO2
(B) NH3
(C) NaCl
(D) KI
| Answer :- (D) |
24. Copper sulphate solution on treatment with excess of KI gives whitish precipitate. The precipitate is :
(A) CuI2
(B) Cu2I2
(C) Cu2SO2
(D) I2
| Answer :- (A) |
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