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Solutions

Board » Bihar Board » Class 12th » English Medium » Science » Chemistry » Part-1 » Unit 2: Solutions

Objective Questions (MCQs)

Question
Multiple Choice
ID- 11802
BSEB, 2020 (A)

1. By osmosis Semipermeable membrane (S.P.M.) allows to pass

  • (A) solute molecules
  • (B) solvent molecules
  • (C) complex ion
  • (D) simple ion
Multiple Choice
ID- 11803
BSEB, 2020 (A)

2. Which of the following the property of ideal solution?

  • (A) Obeys Raoult's law
  • (B) Does not obey Raoult's law
  • (C) Both 'A' and 'B'
  • (D) None of these
Multiple Choice
ID- 11804
BSEB, 2020 (A)

3. The boiling point of water decreases at high mountains because

  • (A) atmospheric pressure is low
  • (B) temperature is low
  • (C) pressure is high
  • (D) more air
Multiple Choice
ID- 11805
BSEB, 2020 (A), 2021 (A)

4. Which of the following is a colligative property of solution?

  • (A) Osmotic Pressure
  • (B) Surface tension
  • (C) Conductivity
  • (D) Half-life period
Multiple Choice
ID- 12199
BSEB, 2013, 2015

5. If 2 gm of NaOH is present in 200 ml of its solution, its molarity will be:

  • (A) 0.25
  • (B) 0.5
  • (C) 5
  • (D) 10
Multiple Choice
ID- 12200

6. The atmospheric pollution in generally measured in the units of:

  • (A) mass percentage
  • (B) volume percentage
  • (C) volume fraction
  • (D) ppm
Multiple Choice
ID- 12201
BSEB, 2018 (A)

7. A 5% solution of cane-sugar (molecular weight = is isotonic with 1% solution of substance X. The molecular weight of X is:

  • (A) 342
  • (B) 171.2
  • (C) 68.4
  • (D) 136.8
Multiple Choice
ID- 12202
BSEB, 2011, 2021 (A)

8. 234.2 gm of sugar syrup contains 34.2 gm of sugar. What is the molal concentration of the solution:

  • (A) 0.1
  • (B) 0.5
  • (C) 5.5
  • (D) 55
Multiple Choice
ID- 12203

9. H2S is a toxic gas used in qualitative analysis. If solubility of H2S in water at STP is 0.195 m, what is the value of KH?

  • (A) 0.0263 bar
  • (B) 69.16 bar
  • (C) 192 bar
  • (D) 282 bar
Multiple Choice
ID- 12204
BSEB, 2016

10. Atomic mass is equal to:

  • (A) number of electrons of an atom
  • (B) sum of the numbers of electrons and photons of an atom
  • (C) sum of the numbers of neutrons and protons of an atom
  • (D) none of these
Multiple Choice
ID- 12205
BSEB, 2021 (A)

11. In comparison to 0.01 M solution of glucose, the depression in freezing point of 0.01 M MgCI2 solution is:

  • (A) same
  • (B) about twice
  • (C) about three times
  • (D) about six times
Multiple Choice
ID- 12206

12. The law which indicates the relationship between solubility of a gas in liquid and pressure is .......... .

  • (A) Raoult's law
  • (B) Henry's law
  • (C) Lowering of vapour pressure
  • (D) van't Hoff law
Multiple Choice
ID- 12207

13. Among the following is substances the lowest pressure is exerted by:

  • (A) water
  • (B) alcohol
  • (C) ether
  • (D) mercury
Multiple Choice
ID- 12208

14. Partial pressure of a solution component is directly proportional to its mole fraction. This is known as

  • (A) Henry's law
  • (B) Raoult's law
  • (C) Distribution law
  • (D) Ostwald's dilution law
Multiple Choice
ID- 12209

15. Which of the following solutions shows positive deviation from Raoult's law?

  • (A) Acetone + Aniline
  • (B) Acetone + Ethanol
  • (C) Water + Nitric acid
  • (D) Chloroform + Benzen
Multiple Choice
ID- 12210

16. The system that forms maximum boiling azeotrope is:

  • (A) Acetone-chloroform
  • (B) ethanol-acetone
  • (C) n-hexane-n-heptane
  • (D) carbon disulphide-acetone
Multiple Choice
ID- 12211

17. A plant cells shrinks when it is kept in a:

  • (A) hypotonic solution
  • (B) hypertonic solution
  • (C) istonic solution
  • (D) pure water
Multiple Choice
ID- 12212

18. A solution containing 10.2 g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?

  • (A) 91.8 g
  • (B) 1198 g
  • (C) 83.9 g
  • (D) 890.3 g
Multiple Choice
ID- 12213
BSEB, 2021 (A)

19. The van't Hoff factor of Ca(NO3)2 is:

  • (A) 1
  • (B) 2
  • (C) 3
  • (D) 4
Multiple Choice
ID- 12214

20. The osmotic pressure of a solution can be increased by

  • (A) increasing the volume
  • (B) increasing the number of solute molecules
  • (C) decreasing the temperature
  • (D) removing semipermeable membrane
Multiple Choice
ID- 12215

21. Sprinkling of salt helps in clearing the snow covered roads in hills. The phenomenon involved in the process is:

  • (A) Lowering in vapour pressure of snow
  • (B) depression in freezing point of snow
  • (C) increase in freezing point of snow
  • (D) melting of ice due to increase in temperature by putting salt
Multiple Choice
ID- 12216
BSEB, 2018 (C)

22. Which aqueous solution has the minimum freezing point?

  • (A) 0.01 M NaCI
  • (B) 0.005 M C2H5OH
  • (C) 0.005 M Mgl2
  • (D) 0.005 M MgSO4
Multiple Choice
ID- 12217
BSEB, 2018 (A)

23. What will be the degree of dissociation of 0.1 M Mg(NO3)2 solution if van't Hoff factor is 2.74?

  • (A) 75%
  • (B) 87%
  • (C) 100%
  • (D) 92%
Multiple Choice
ID- 12218

24. Which of the following units in useful in relating concentration of solution with its vapour pressure?

  • (A) Mole fraction
  • (B) Parts per million
  • (C) Mass percentage
  • (D) Molality
Multiple Choice
ID- 12307

25. At equilibrium the rate of dissociation of a solid solute in a volatile liquid solvent is .......... .

  • (A) less then the rate of crystallisation
  • (B) greater than the rate of crystallisation
  • (C) equal to the rate of crystallisation
  • (D) zero
Multiple Choice
ID- 12308
BSEB, 2018 (C)

26. The pH of human blood is approximately:

  • (A) 6.5
  • (B) 7.0
  • (C) 7.4
  • (D) 8.2
Multiple Choice
ID- 12309

27. Low concentration of oxygen in the blood and tissues of people living at high attitude is due to .......... .

  • (A) low temperature
  • (B) low atmospheric pressure
  • (C) high atmospheric pressure
  • (D) Both low temperature and high atmospheric pressure
Multiple Choice
ID- 12310
BSEB, 2019 (A)

28. pH of pure water is:

  • (A) 1
  • (B) 4
  • (C) 3
  • (D) 7
Multiple Choice
ID- 12311
BSEB, 2017 (A)

29. Which of the following aqueous solutions should have the highest boiling point?

  • (A) 1.0 M NaOH
  • (B) 1.0 M Na2SO4
  • (C) 1.0 M NH4NO3
  • (D) 1.0 M KNO3
Multiple Choice
ID- 12312

30. The unit of ebulioscopic constant is .......... .

  • (A) K kg mol–1 or K (molality)–1
  • (B) mol kg K–1 or K–1 (molality)
  • (C) kg mol–1 or K–1 (molality)–1
  • (D) K mol kg–1 or K (molality)
Multiple Choice
ID- 12313
BSEB, 2021 (A)

31. Which is not affected by temperature?

  • (A) Normality
  • (B) Molality
  • (C) Molarity
  • (D) Formality
Multiple Choice
ID- 12314

32. Value of Henry's constant KH .......... .

  • (A) greater for gases with higher solubility
  • (B) greater for gases with lower solubility
  • (C) constant for all gases
  • (D) not related to the solubility of gases
Multiple Choice
ID- 12315
BSEB, 2017 (A)

33. A solution has an osmotic pressure of 0.0821 atm. at 300 K. Its concentration should be:

  • (A) 0.66 m
  • (B) 0.32 m
  • (C) 0.066 m
  • (D) 0.033 m
Multiple Choice
ID- 12316
BSEB, 2017 (A)

34. A zeotropic mixture of HCI and H2O has:

  • (A) 48% HCI
  • (B) 22.21 HCI
  • (C) 36% HCI
  • (D) 20.2%
Multiple Choice
ID- 12317
BSEB, 2016 (C)

35. Osmotic pressure can be increased by:

  • (A) Increasing temperature
  • (B) decreasing temperature
  • (C) increasing volume
  • (D) none
Multiple Choice
ID- 12318
BSEB, 2017 (C)

36. The freezing point of an aqueous solution is –0.186°C. What is the elevation of boiling point of this solution if Kf = 1.86 and Kb = 0.512?

  • (A) 0.186
  • (B) –0.512
  • (C) 1.86
  • (D) 0.0512
Multiple Choice
ID- 12319
BSEB, 2017 (C)

37. Which of the following is not a colligative property of solution?

  • (A) Depression of freezing point
  • (B) Elevation of Boiling point
  • (C) Relative lowering vapour pressure
  • (D) Optical activity
Multiple Choice
ID- 12320

38. The value of Henry's constant KH is .......... .

  • (A) greater for gases with higher solubility
  • (B) greater for gases with lower solubility
  • (C) constant for all gases
  • (D) not related to the solubility of gases
Multiple Choice
ID- 12337
BSEB, 2021 (A)

39. Tyndall effects is observed in:

  • (A) Solution
  • (B) Precipitate
  • (C) Colloidal Solution
  • (D) Vapours
Multiple Choice
ID- 14513
BSEB, 2020 (A)

40. Which of the following equations represent osmotic pressure?

  • (A) P = CRT
  • (B) P = $\frac{CT}{R}$
  • (C) P = $\frac{RC}{T}$
  • (D) P = $\frac{RT}{C}$
Multiple Choice
ID- 14514
BSEB, 2017 (C)

41. If n is number of moles of solute and N is number of moles of solvent then mole fraction strength of solute is:

  • (A) n + N
  • (B) $\frac{n}{N + n}$
  • (C) $\frac{N}{N + n}$
  • (D) $\frac{n}{N}$