Unit 5 » Surface Chemistry- MCQs (12th) | Chemistry | Objective Questions- 12th

Multiple Choice

ID- 12678

BSEB, 2020 (A)

1. Tyndall effect is not found is:

(A) sugar solution
(B) colloidal solution of gold
(C) suspension
(D) emulsion

Sep 13, 2022 at 05:04 AM

Multiple Choice

ID- 12679

BSEB, 2020 (A)

2. Chemical adsorption reaction is:

(A) reversible
(B) irreversible
(C) polymerisation
(D) none of these

Sep 13, 2022 at 05:05 AM

Multiple Choice

ID- 12680

BSEB, 2015

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

Sep 13, 2022 at 05:08 AM

Multiple Choice

ID- 12681

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

Sep 13, 2022 at 05:11 AM

Multiple Choice

ID- 12682

BSEB, 2012, 2016

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

(A) Milk
(B) Gum
(C) Fog
(D) Blood

Sep 13, 2022 at 05:12 AM

Multiple Choice

ID- 12683

BSEB, 2021 (A)

6. Milk is an example of:

(A) emulsion
(B) suspension
(C) sol
(D) none of these

Sep 13, 2022 at 05:13 AM

Multiple Choice

ID- 12684

BSEB, 2021 (A)

7. In physical adsorption the approximate heat energy evolved in kJ/mol is:

(A) 20–40
(B) 40–60
(C) 60–80
(D) 40–400

Sep 13, 2022 at 05:15 AM

Multiple Choice

ID- 12685

8. Shape-selective catalysis is a reaction catalysed by

(A) zeolite
(B) enzymes
(C) platinum
(D) Ziegler-Natta-catalyst

Sep 13, 2022 at 05:17 AM

Multiple Choice

ID- 12686

9. 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

Sep 13, 2022 at 05:20 AM

Multiple Choice

ID- 12687

10. The oxide of nitrogen which acts as a catalyst in lead chamber process is:

(A) No
(B) NO₂
(C) N₂O₄
(D) H₂O₅

Sep 13, 2022 at 05:22 AM

Multiple Choice

ID- 12688

11. The activity of an enzyme becomes ineffective

(A) at low temperature
(B) at atmospheric pressure
(C) at high temperature
(D) in aqueous medium

Sep 13, 2022 at 05:23 AM

Multiple Choice

ID- 12689

12. Which of the following can adsorb larger volume of hydrogen gas?

(A) Finely divided platinum
(B) colloidal solution of palladium
(C) Small pieces of palladium
(D) A single metal surface of platinum

Sep 13, 2022 at 05:25 AM

Multiple Choice

ID- 12690

13. Which of the following gases present in a polluted area will be absorbed most easily on the charcoal gas mask?

(A) H₂
(B) O₃
(C) N₂
(D) SO₂

Sep 13, 2022 at 05:27 AM

Multiple Choice

ID- 12691

14. Which kind of catalysis can be explained on the basis of adsorption theory?

(A) Homogeneous catalysis
(B) Heterogeneous catalysis
(C) Negative catalysis
(D) Auto catalysis

Sep 13, 2022 at 05:29 AM

Multiple Choice

ID- 12692

15. A colloidal system in which liquid is dispersal phase and solid is dispersion medium is classified as:

(A) gel
(B) sol
(C) emulsion
(D) aerosol

Sep 13, 2022 at 05:31 AM

Multiple Choice

ID- 12693

16. Which of the following will not form a colloidal system:

(A) Solid gas
(B) Liquid-gas
(C) Gas-gas
(D) Gas-liquid

Sep 13, 2022 at 05:33 AM

Multiple Choice

ID- 12694

17. Fog is an example of colloidal system of:

(A) liquid in gas
(B) gas in liquid
(C) solid in gas
(D) gas in solid

Sep 13, 2022 at 05:34 AM

Multiple Choice

ID- 12695

18. Substance which behave as normal electrolytes solution at low concentration and exhibit colloida properties at higher concentration are called:

(A) lyophilic colloids
(B) lyophobic colloids
(C) macromolecular colloids
(D) associated colloids

Sep 13, 2022 at 05:37 AM

Multiple Choice

ID- 12696

19. 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

Sep 13, 2022 at 05:38 AM

Multiple Choice

ID- 12697

20. The formation of micelles takes place only above

(A) critical temperature
(B) Kraft temperature
(C) inversion temperature
(D) absolute temperature

Sep 13, 2022 at 05:41 AM

Multiple Choice

ID- 12698

21. 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

Sep 13, 2022 at 05:43 AM

Multiple Choice

ID- 12699

22. At CMC (critical micelle concentration) the surface molecules

(A) dissociate
(B) associate
(C) become bigger in size due to adsorption
(D) become smaller in size due to decomposition

Sep 13, 2022 at 05:45 AM

Multiple Choice

ID- 12700

23. Which of the following is not a method for coagulation of lyophobic sols?

(A) By electrophoresis
(B) By mixing oppositely charged sols
(C) By adding electrolyte
(D) By adding a protective colloid

Sep 13, 2022 at 05:48 AM

Multiple Choice

ID- 12701

24. Why is alum added to water containing suspended impurities?

(A) To make a colloidal solution
(B) To coagulate the suspended impurities
(C) To protect the colloidal solution from getting precipitated
(D) To remove impurities of calcium and magnesium

Sep 13, 2022 at 05:51 AM

Multiple Choice

ID- 12702

25. Movement of the following medium under the influence of electric field is known as:

(A) electrodialysis
(B) electrophoresis
(C) electrosmosis
(D) cataphoresis

Sep 13, 2022 at 05:53 AM

Multiple Choice

ID- 12703

26. Which of the following is not a method of removing impurities from a colloidal sol?

(A) Electrodialysis
(B) Ultrafiltration
(C) Ultra centrifugation
(D) Distillation

Sep 13, 2022 at 05:55 AM

Multiple Choice

ID- 12704

27. Which of the following is not correctly matched?

(A) Gelatin-Lyophilic colloid
(B) Gold sol-Lyophilic colloid
(C) Arsenious sulphide-Lyophobic colloid
(D) Ferric hydroxide-Lyophobic colloid

Sep 13, 2022 at 05:58 AM

Multiple Choice

ID- 12705

BSEB, 2018 (C)

28. Tyndall effect can be observed in a:

(A) solvent
(B) precipitate
(C) colloidal solution
(D) solution

Sep 13, 2022 at 05:59 AM

Multiple Choice

ID- 12706

BSEB, 2021 (A)

29. How many layers are involved in chemical adsorption?

(A) One
(B) Two
(C) Many
(D) Zero

Sep 13, 2022 at 06:00 AM

Multiple Choice

ID- 12707

30. Some medicines are more effective in the colloidal form because of

(A) the charged colloidal particles present in it
(B) the large surface area and easy assimilation
(C) precipitation of medicine in the blood
(D) the stabilisation of medicine in colloidal from

Sep 13, 2022 at 06:03 AM

Multiple Choice

ID- 12708

31. Soap mixed with water below critical micelle concentration behaves as:

(A) associated colloid
(B) macromolecular colloid
(C) normal electrolytic solution
(D) multimolecular colloidal

Sep 13, 2022 at 06:06 AM

Multiple Choice

ID- 12709

32. White of an egg whipped with water acts as

(A) macromolecular colloid
(B) associated colloid
(C) molecular colloid
(D) normal electrolytic solution

Sep 13, 2022 at 06:07 AM

Multiple Choice

ID- 12710

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

(A) Crystallisation
(B) Heterogeneous catalysis
(C) Homogeneous catalysis
(D) Corrosion

Sep 13, 2022 at 06:09 AM

Multiple Choice

ID- 12711

34. The term 'sorptio' stands for .......... .

(A) absorption
(B) adsorption
(C) both absorption and adsorption
(D) desorption

Sep 13, 2022 at 06:11 AM

Multiple Choice

ID- 12712

35. Extent of physisorption of 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 Walls forces

Sep 13, 2022 at 06:13 AM

Multiple Choice

ID- 12713

36. 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

Sep 13, 2022 at 06:17 AM

Multiple Choice

ID- 12714

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

(A) decrease in temperature and low pressure
(B) increase in temperature and high pressure
(C) increase in surface area of adsorbent
(D) decrease in surface area of adsorbent

Sep 13, 2022 at 06:19 AM

Multiple Choice

ID- 12715

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

(A) molecular colloid
(B) associated colloid
(C) macromolecular colloid
(D) lyophilic colloids

Sep 13, 2022 at 06:21 AM

Multiple Choice

ID- 12716

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

(A) coagulation
(B) electrolysis
(C) diffusion
(D) peptisation

Sep 13, 2022 at 06:22 AM

Multiple Choice

ID- 12717

40. Which of the following electrolytes will have maximum coagulating value of AgI/Ag^{+ sol?}

(A) Na₂S
(B) Na₃PO₄
(C) Na₂SO₄
(D) NaCI

Sep 13, 2022 at 06:25 AM

Multiple Choice

ID- 12718

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

(A) solid sol
(B) gel
(C) emulsion
(D) sol

Sep 13, 2022 at 06:27 AM

Multiple Choice

ID- 12719

42. 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

Sep 13, 2022 at 06:29 AM

Multiple Choice

ID- 12720

BSEB, 2017 (A)

43. 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

Sep 13, 2022 at 06:31 AM

Multiple Choice

ID- 12721

BSEB, 2016 (C)

44. Which of the following is an example of solid-solid system?

(A) Smoke
(B) Caje
(C) Synthetic gems
(D) Pumice stone

Sep 13, 2022 at 06:33 AM

Multiple Choice

ID- 12722

BSEB, 2017 (C)

45. P₂O₂ is a good:

(A) Absorbend
(B) Absorbent
(C) Reducing agent
(D) Bleaching of colour

Sep 13, 2022 at 06:34 AM

Multiple Choice

ID- 12723

BSEB, 2018 (A)

46. Which gas is absorbed strongly by charcoal?

(A) CO
(B) NH₃
(C) NCI₃
(D) H₂

Sep 13, 2022 at 06:35 AM

Multiple Choice

ID- 12724

BSEB, 2018 (A)

47. Which of the following gives yellow or brown precipitate with alkaline Nessler's reagent?

(A) CO₂
(B) NH₃
(C) NaCI
(D) KI

Sep 13, 2022 at 06:37 AM

Multiple Choice

ID- 12725

BSEB, 2018 (A)

48. Copper sulphate solution on treatment with excess of KI gives whitish precipitate. The precipitate is:

(A) Cu I₂
(B) Cu₂I₂
(C) Cu₂SO₂
(D) I₂

Sep 13, 2022 at 06:39 AM

Multiple Choice

ID- 14559

BSEB, 2018 (C)

49. For absorption of a gas on a solid sirface, the plot of log $\frac{x}{m}$ Vs. log P is linear with slope equal to:

(A) K
(B) log K
(C) In K
(D) $\frac{1}{n}$

Sep 29, 2022 at 06:59 AM

Surface Chemistry

Board » Bihar Board » Class 12th » English Medium » Science » Chemistry » Part-1 » Unit 5: Surface Chemistry

Objective Questions (MCQs)

1. Tyndall effect is not found is:

2. Chemical adsorption reaction is:

3. Volume of one mole of any gas at NTP is:

4. Tyndall effect confirms the:

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

6. Milk is an example of:

7. In physical adsorption the approximate heat energy evolved in kJ/mol is:

8. Shape-selective catalysis is a reaction catalysed by

9. Which of the following types of metals make the most efficient catalyst?

10. The oxide of nitrogen which acts as a catalyst in lead chamber process is:

11. The activity of an enzyme becomes ineffective

12. Which of the following can adsorb larger volume of hydrogen gas?

13. Which of the following gases present in a polluted area will be absorbed most easily on the charcoal gas mask?

14. Which kind of catalysis can be explained on the basis of adsorption theory?

15. A colloidal system in which liquid is dispersal phase and solid is dispersion medium is classified as:

16. Which of the following will not form a colloidal system:

17. Fog is an example of colloidal system of:

18. Substance which behave as normal electrolytes solution at low concentration and exhibit colloida properties at higher concentration are called:

19. Which of the following acts as the best coagulating agent for ferric hydroxide sol?

20. The formation of micelles takes place only above

21. The size of colloidal particles ranges between

22. At CMC (critical micelle concentration) the surface molecules

23. Which of the following is not a method for coagulation of lyophobic sols?

24. Why is alum added to water containing suspended impurities?

25. Movement of the following medium under the influence of electric field is known as:

26. Which of the following is not a method of removing impurities from a colloidal sol?

27. Which of the following is not correctly matched?

28. Tyndall effect can be observed in a:

29. How many layers are involved in chemical adsorption?

30. Some medicines are more effective in the colloidal form because of

31. Soap mixed with water below critical micelle concentration behaves as:

32. White of an egg whipped with water acts as

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

34. The term 'sorptio' stands for .......... .

35. Extent of physisorption of gas increases with ..........

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

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

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

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

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

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

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

43. A catalyst is a substance which:

44. Which of the following is an example of solid-solid system?

45. P2O2 is a good:

46. Which gas is absorbed strongly by charcoal?

47. Which of the following gives yellow or brown precipitate with alkaline Nessler's reagent?

48. Copper sulphate solution on treatment with excess of KI gives whitish precipitate. The precipitate is:

49. For absorption of a gas on a solid sirface, the plot of log $\frac{x}{m}$ Vs. log P is linear with slope equal to:

40. Which of the following electrolytes will have maximum coagulating value of AgI/Ag^{+ sol?}

45. P₂O₂ is a good: