Physical Chemistry Class-12 Chapter-5 Surface chemistry Most VVI Objective Questions

Q.1. P₂O₅ is a good

(A) adsorbate

(B) absorbent

(C) Reducing agent

(D) Bleaching of colour

Ans :- (B)

Q.2. Which gas is absorbed strongly by charcoal

(A) Co

(B) NH₃

(C) NCl₃

(D) H₂

Ans :- (C)

Q.3. A vogadro’s number (N) is equal to

(A)  6.023 × 10²⁴

(B) 6.023 × 10²³

(C) 6.023 × 10⁻²³

(D) 11.2

Ans :- (B)

Q.4. 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

Ans :- (B)

Q.5. Which one of the following is a lyophilic colloid

(A) Milk

(B) gum

(C) fog

(D) blood

Ans :- (B)

Q.6. Which is not correct for physical adsorption

(A) adsorption increase with temperature

(B) adsorption is spontaneous

(C) enthalpy and entropy both are negative for adsorption

(D) adsorption on solid is reversible

Ans :- (A)

Q.7. Fog is an example of colloidal system of

(A) liquid in gas

(B) gas in liquid

(C) solid in gas

(D) gas in solid

Ans :- (A)

Q.8. Which of the following will not form a colloidal system

(A) solid gas

(B) liquid gas

(C) gas – gas

(D) gas – liquid

Ans :- (C)

Q.9. Which of the following type of metal make the most efficient catalyst

(A) Alkali metals

(B) Transition metals

(C) inner transition metals

(D) Alkaline earth metals

Ans :- (B)

Q.10. The velocity of colloidal particles in electric field is called

(A) Dialysis

(B) electrophoresis

(C) electrical dialysis

(D) none of these

Ans :- (B)

Q.11. The oxide of nitrogen which act as a catalyst in lead chamber process is

(A) No

(B) NO₂

(C) N₂O₄

(D) H₂O₅

Ans :- (A)

Q.12. Tyndall effect is found in

(A) solution

(B) precipitate

(C) sol

(D) vapour

Ans :- (C)

Q.13. Tyndall effect is not observed in

(A) suspensions

(B) emulsions

(C) sugar solution

(D) gold solution

Ans :- (C)

Q.14. The dispersion of liquid in a liquid is called

(A) Gel

(B) forath

(C) emulsion

(D) aerosol

Ans :- (C)

Q.15. The purification of colloidal solution is done by

(A) filtration

(B) centifugation

(C) dialysis

(D) osmosis

Ans :- (C)

Q.16. the catalyst used in the preparation of grig mard reagent is

(A) iodine turnings

(B) iron turning

(C) manganese oxide

(D) active charcoal

Ans :- (B)

Q.17. the dispersion of a liquid on solid is called

(A) sol

(B) Gel

(C) emulsion

(D) foam

Ans :- (B)

Q.18. finely divided catalysts are more active because

(A) less surface area is available

(B) more active centres are formed

(C) limited number of molecules

(D) surface area increases

Ans :- (B)

Q.19. Puple of casius is the callodial solution of

(A) copper

(B) iron

(C) gold

(D) silver

Ans :- (B)

Q.20. An example of biological catalyst is

(A) an enzyme

(B) a carbohydrate

(C) an amino acid

(D) a nitrogenous buse

Ans :- (A)

Q.21. An example of hydrophobic colloid

(A) starch

(B) gelatin

(C) gum

(D) sulphur

Ans :- (D)

Q.22. Milk can be preserved for some time using

(A) formic acid solution

(B) formaldehyde solution

(C) Acetic add solution

(D) acetal dehyde solution

Ans :- (B)

Q.23. how many layers are involved in chemical adsorption

(A) one

(B) two

(C) many

(D) zero

Ans :- (A)

Q.24. TED is added to petrol as an antik nocking agent

(A) promotor of catalyst

(B) negative catalyst

(C) positive catalyst

(D) auto catalyst

Ans :- (B)

Q.25. the process of adsorption is

(A) exothermic

(B) endothermic

(C) exothermic and endothermic

(D) none of these

Ans :- (A)

Q.26. the function of moderator is

(A) increasing rate of reaction

(B) increasing the catalytic activity of catalyst

(C) increasing the temperature of reaction

(D) increasing the concentration of product of the reaction

Ans :- (B)

Q.27. The  decomposition H₂O₂ shows down in the presence of glycerine. The glycerine here act as

(A) poison

(B) inhibitor

(C) promotor

(D) all of these

Ans :- (B)

Q.28. At CMC the surface particle

(A) decompose

(B) completely soluble

(C) becomes aggregated

(D) separated

Ans :- (C)

Q.29. Tyndall effect confirms the

(A) gravity effect on the sol particles

(B) light scattering by the sol particles

(C) heterogenous nature of sols

(D) brownian motion of the sol particles

Ans :- (C)

Q.30. At CMC the surface particle

(A) decompose

(B) Completely soluble

(C) becomes aggregated

(D) separated

Ans :- (C)

Q.31. The phenomenon of a molecular species at the surface of a solid or liquid is called

(A) absorption

(B) adsorption

(C) coagulation

(D) none of these

Ans :- (B)

Q.32. Fog is an example of colloidal system of

(A) gas in liquid

(B) liquid in gas

(C) solid in liquid

(D) liquid in liquid

Ans :- (B)

Q.33. Which among the following show the character is tics of a catalyst

(A) it change the equilibrium point

(B) it starts the reaction

(C) it increases the rate of reaction

(D) it increases the kinetic energy of molecules

Ans :- (C)

Q.34. Which among the following is less than zero in adsorption

(A) ΔG

(B) Δsm

(C) ΔH

(D) all of the above

Ans :- (D)

Q.35. The activity of catalyst depend on

(A) mass

(B) solubility

(C) size of particle

(D) none of these

Ans :- (C)

Q.36. Cloud is an example of

(A) solid dispersed in gas

(B) liquid dispersed in gas

(C) liquid dispersed in solid

(D) solid dispersed in liquid

Ans :- (B)

Q.37. Positively charged sol is

(A) blood

(B) gelatin in strong acidic solution

(C) smoke

(D) clay

Ans :- (A)

Q.38. In auto – catalysis

(A) Reactant catalysts

(B) Heat evolved in reaction catalyses

(C) Products catalyses

(D) solvent catalyses

Ans :- (C)

Q.39. Which among the following adsorbs hydrogen gas

(A) activated Charcoal

(B) silica gel

(C) platinum black

(D) finely divided iron

Ans :- (C)

Q.40. The fresh precipitate can be transformed in colloidal solution by

(A) coagulation

(B) peptization

(C) diffusion

(D) none of these

Ans :- (B)



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