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NCERT Class 12 Important Chemistry Questions with Answers For 2021 Important Chemistry Questions for Exams Chapter 2 Solution Short Questions with Answer
NOTE: NCERT Solutions for Class 12 Chemistry : The NCERT solutions provided here will enhance the concepts of the students, as well as suggest alternative methods to solve particular problems to the teachers. So, the target is to direct individuals towards problem solving strategies, rather than solving problems in one prescribed format. The links below provide the detailed solutions for all the Class 12 Chemistry problems
1. Two solutions of equal Osmotic pressure are known as
(b) Nonideal solution
(a) ldeal solution
(c) Isotonic solution
(d) Hypotonic solution
2. In which of the following process semipermeable membrane is required.
(b) Diffusion
(a) Osmosis
(d) Filtration
(c) Decantation
3.Vapour pressure is measured at
(a) Forwarsd Reaction
(b) Equilibrium
(C) Backward Reaction
(d) semulate
4. None Vapour pressure iS measured in –
(b) Colsed container
(a) Open containor
(d) None
(c)Both the case
5. When vapour pressure of liquid becomes equal to atmospheric pressure then the temperature is known as
(b) Melting point
(a) Boiling point
(c) Sublimation Temperature (d) None
6.When vapour pressure of liquid becomes equal to atmosphere pressure
(a) All the liquid is transformed into gas
(b) All the Gas is transformed into liquid
(C) Liquid and Gas Remain in equilibrium
(d) Can’t be said
7.When Temperature increases vapour pressure of liquid
(b) Decreases
(a) Increases
(d) Can’t be said
(c) Remain same
8. The solution which obeys Raoult’s law is-
(b) Ideal
(a) Isotonic
(d) Critical solution
(C) Non ideal
9.Henry’s law is related to-
(b) Liquid
(a) Solid
(d) Solution
(c) Gas
10. In Ideal solution
(a) No Enthalpy and volume change occurs
(b) Volume is changed but enthalpy does not change
(c) Enthalpy in changed but volume does not change
(d) Both Enthalpy and volume is changed.
11. Constant oiling mixtures are known as
(b) Eutectics
(a) Azcotropes
(d) Foam
(c) True solution
12 Constant Freezing mixtures are known as
(b) Eutectics
(a) Azeotropes
(c) True solution
(d) Foam
13. Which of the following mixture is an example of ldeal solution
(a) Benzene + chloroform
(b) Acetone + Benzene
(c) Benzene + Toluene
(d) None of these
14. Which of the following is not an ideal mixture
(a) n-Hexane + n-Heptane.
(b) Chlorobenzene + Bromobenzene
(c) Ethyl Bromide + Ethyl lodide
(d) Water + methanol
15. Which of the following is an example of minimum boiling Azeotropes
(a) Acetone + Ethanol
(b) Ethylbromide + Ethyl Iodide
(c) Chloroform + Diethylether
(d) None of these
16.Which of the following is not an example of non ideal solution showing positive deviation.
(a) Acetone + Aniline
(b) Acetone +Carbondisulfide
(c) Ethanol +Cyclohexane
(d) Carbontetrachloride + Toluene
17. Which of the following is not an example of non ideal solution showing negative deviation.
(a) Chloroform + Nitric Acid
(6) Chloroform + Acetane
(c) Chloroform + Carbontetrachloride
(d) Nitric Acid + Water
18. Which of the following is an example of maximum boiling Azeatropes.
(a) Chlorobenzene + Bromo benzene
(b) Chloroform + Nitric Acid
(c) Carbontera chloride + Chloroform
(d) None of these
19. Non ideal solution showing positive deviation is known as
(a) Minimum boiling Azeotropes
(b) Maximum boiling Azeotropes
(c) Medium boiling Azeotropes
(d) Eutecties
20. Non ldeal solution shoWing negative deviation is known as
(a) Minimum boiling Azeotropes
(b) Maximum boiling Azeotropes
(c) Medium boiling Azeotropes
(d) None of these
21. For non ideal solution showing positive deviation volume change is
(b) Positive
(a)Zero
(d) None of these
(c) Negative
22.For non ideal solution showing negative deviation Enthalpy change is:
(b)Positive
(a) Negative
(d) None of these
(c) Zero
23. For minimum boiling Azeatropes the total vapour pressure will be
(a) Less than expected value
(b) More than expected value
(c) Same as expected value
(d) Can’t be said
24. For maximum boiling Azeatropes the total vapour pressure will be
(a) Less than expected value
(6) More than expected value
(c) Same as expected value
(d) Can’t be said
25. For solution showing positive deviation which is false.
(a) AH 0mix
(b) AV 0mix
C)PPA+PB
(d) P= Px,
26. For solution showing negative devi1ation which is false.
(a) P,<P+P
(b)AH-ve
(c) P=P Xmix
(d) AV mix-Ve
27. Which of the following is not true for ideal solution
(a) AVm0
(b) AHmix0
(c) P#P+Pmix
(d) PA=PAX
28.With increase in surtace arca vapour pr Of solution
(b) Increases
(d) Can’t be said
(a) Decreases
(c) Remain same
29.Vapour pressure of solution decreases with_______________in temperature
(b) Increase
(d) None of these
(a) Decrease
(c) Independentthan solution
30. Vapour pressure of solvent is-
(b) More
(d) Independent
(a) Less
(c) Equal to
than pure solvent
31. Boiling point of solution is
(b) LesS
(a) More
(d) Can’t be said
(c) Equal to
than solution
32. Freezing point of pure solvent is
(b) More
(a) Less
(d) Can’t be said
(c) Equal
33 For Raoults law containing volatile solute theexpression is
AP
(a) X solute
(a) P= PXP
(c) Xoe
(d) None of these
34. The expression for Raoult’s Law containing non volatile solute is
(a) P solvent (b) P=P*Xsobven
A X olven
AP
(c) = A solute
(d)PoP
35. Colligative property depends upon
(a) Number of particles of solute
(b) Number of particle of solvent
(c) Total Number of Particles in solution
(d) All of these
36. The expression for Henry law is
(a) X-KP
(b) P-K
(c) P=PX
(d) All of these
37. Which of the following is not a colligative proper
(a) Relative lowering in vapour pressure
(b) Osmotic pressure
(c) Diffusion
(d) Elevation in Boiling point
38. Which of the following is a colligative propet
(a) Depression in freezing point
(b) Freezing point
(c) Boiling point
(d) All of these
39. According to Henry’s law amount of gas dissolved
in a liquid is with pressure
(a) Inversely proprotional
b) Directly proportional
(c) Equal
(d) None of these
40. The phenomenon by which plants derive water from their roots against the law of gravitation is called
(a) Osmosis
(b) Reverse Osmosis
(c) Diffusion
(d) Surface tension
41. Which of the following colligative property can provide molar mass of proteins with great precision?
(a) Relative lowering in vapour pressure
(b) Osmotic Pressure
(c) Elevation in Boiling point
(d) Depression in freezing point
42. The freezing point of equimolar aquous solution will be highest for
(6) La(NO,),
(a) Ca(N0,),
(d) CH,0,
(c) CHNH,CI
43. Which of the following solution will have greater depression in freezing point
(b) IM Accetic Acid
(a) IM Glucose
(c) IM NaCl
(d) IMMgCl,
44.Which of the following is true for ideal solution?
(6) AH = 0
(a) AV 0
mIx
(d) all of these
(c) P,-PA+ PB
45. During depression of freezing point in a solution which are in equilibrium
(a) Liquid solvent and solid solvent
(b) Liquid solvent and solid solute
(C) Liquid solute and solid solute
(d) Liquid solute and solid solvent
46. After adding a solute freezing point of aqueous solution decreases to -0-186°C. Calculate AT, if k, = 1-86 and k = 0:521
(b) 0-521
(a) 0-0521
(d) 1-521
(c) 11-21
47. 18g glucose is added to 180g water. The vapour pressure of water for this aqueous solution at 100°C iS
(b) 752.4 torr
(a) 759 torr
(d) 760 torr
(c) 7.6 torr
48. A 0-004 M solutionof Na,SO, is isotonio with temperature. The approximna precentage ofGlucose at the same0-010M solutionDissociation is
(b)50%
(a) 25%
(d) 100%
(c) 75%
49. Molar depression constant of a solvent having freezing point 16-6°c and L, 180.75 J/g is
(b) 3-86
(a) 2-68
(d) 2.86
(c) 4-68
50. The mole fraction of Solute in molal aqueous solution is
(b) 0-036
(a) 0-027
(d) 0-009
(c) 0-018
ANSWER-
1.(c) 2. (a) 3. (b) 4. (b) 5. (a) .6. (a) 7. (a) 8. (b) 9. (c) 10. (a) 11. (a) 12 (b) 13. (c) 14. (d) 15. (a) 16. (a) 17. (c) 18. (b) 19. (a) 20. (6) 21. (b) 22. (a) 23. (b) 24. (a) 25. (d) 26. (c) 27. (c) 28. (c) 29. (a) 30. (b) 31. (a) 32. (b) 33. (a) 34. (c) 35. (a) 36. (b) 37. (c) 38. (a) 39. (b) 40. (a) 41. (b) 42. (d) 43. (d) 44. (d) 45. (a) 46. (a) 47. (b) 48. (c) 49. (b) 50. (c)
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