For carrying reverse osmosis for desalination of water the material used for making semipermeable membrane is
  • potassium nitrate
  • parchment membrane
  • cellulose acetate
  • cell membrane
What will be the degree of dissociation of 0.1 M Mg(NO
  • 75%
  • 87%
  • 100%
  • 92%
Which of the following units is useful in relating concentration of solution with its vapour pressure?
  • Mole fraction
  • Parts per million
  • Mass percentage
  • Molality
At equilibrium the rate of dissociation of a solid solute in a volatile liquid solvent is
  • less than the rate of crystallisation
  • greater than the rate of crystallisation
  • equal to the rate of crystallisation
  • zero
Find the molality of 10% aq. glucose solution.
  • .67 m
  • .45 m
  • .12 m
  • .8 m
On the basis of information given below mark the correct option. Information : On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.
  • At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult’s law
  • At specific composition methanol-acetone mixture forms maximum boiling azeotrope and will show positive deviation from Raoult’s law.
  • At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show negative deviation from Raoult’s law.
  • At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show negative deviation from Raoult’s law
which of these is a  colligative property
  • Boling point
  • Freezing point
  • Vapour pressure
  • Osmotic pressure
which of the following is dependent of temperature
  • Mole fraction
  • Molality
  • Weight percentage
  • Molarity
Which of the following statements is false?
  • Units of atmospheric pressure and osmotic pressure are the same.
  • In reverse osmosis, solvent molecules move through a semipermeable membrane from a region of lower concentration of solute to a region of higher concentration.
  • The value of molal depression constant depends on nature of solvent.
  • Relative lowering of vapour pressure, is a dimensionless quantity.
The vapour pressure of pure liquid ‘A’ is 0.158 bar. The V. P. of this liquid in solution with a liquid B is 0.095 bar. Find the mole fraction of ‘A’ if the mixture obeys Raoult’s law.
  • .5
  • .15
  • .61
  • cant say
The Elevation in boiling point for 1 m urea, 1 m glucose, 1 m NaCl and 1 m $K_2SO_4$ are in the ratio:
  • 1 : 1: 2 : 3
  • 3 : 2 : 1: 1
  • 1 : 2 : 3 : 4
  • 2 : 2 : 3 : 4
The values of Van’t Hoff factors for KCl, NaCl and $K_2SO_4$ , respectively, are
  • 2, 2 and 2
  • 2, 2 and 3
  • 1, 1 and 2
  • 1, 1 and 1
Match the column
solutions-class12-mcq-1.png
  • p -> iii, q -> i , r -> ii
  • p -> iii, q -> ii, r -> i
  • p -> ii, q -> i , r -> iii
  • p -> i, q -> ii, r -> iii
Match the column
solutions-class12-mcq-2.png
  • p-> iii, q -> ii, r -> iv, s -> ii
  • p-> ii, q -> iv, r -> iii, s -> i
  • p-> iii, q -> iv, r -> i, s -> ii
  • p-> iii, q -> iv, r -> ii, s -> i
Assertion and Reason (a) Assertion and reason both are correct statements and reason is correct explanation for assertion. (b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. (c) Assertion is correct statement but reason is wrong statement. (d) Assertion and reason both are incorrect statements. (e) Assertion is wrong statement but reason is correct statement. Assertion : When NaCl is added to water a depression in freezing point is observed. Reason : The lowering of vapour pressure of a solution causes depression in the freezing point
  • a
  • b
  • c
  • d
  • e
Assertion and Reason (a) Assertion and reason both are correct statements and reason is correct explanation for assertion. (b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. (c) Assertion is correct statement but reason is wrong statement. (d) Assertion and reason both are incorrect statements. (e) Assertion is wrong statement but reason is correct statement. Assertion : Solutions shows deviation from Rauolt’s  law Reason : The cause in deviation lies in the level of interaction at molecular level
  • a
  • b
  • c
  • d
  • e
Assertion and Reason (a) Assertion and reason both are correct statements and reason is correct explanation for assertion. (b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. (c) Assertion is correct statement but reason is wrong statement. (d) Assertion and reason both are incorrect statements. (e) Assertion is wrong statement but reason is correct statement. Assertion : Elevation in boiling point will be high if the molal elevation constant of the liquid is high Reason : Elevation in boiling point is a  colligative property
  • a
  • b
  • c
  • d
  • e
Assertion and Reason (a) Assertion and reason both are correct statements and reason is correct explanation for assertion. (b) Assertion and reason both are correct statements but reason is not correct explanation for assertion. (c) Assertion is correct statement but reason is wrong statement. (d) Assertion and reason both are incorrect statements. (e) Assertion is wrong statement but reason is correct statement. Assertion : When methyl alcohol is added to water, boiling point of water increases. Reason : When a volatile solute is added to a volatile solvent elevation in boiling point is observed.
  • a
  • b
  • c
  • d
  • e
Link comprehension At 20° C the vapour pressure of pure A and pure B is 22 mm & 75 mm respectively. The vapour pressure of the solution prepared from A and B  is 48.5 mm of Hg Find the mole fraction of Component A
  • .5
  • .6
  • .43
  • .56
. Find the mole fraction of Component B
  • .5
  • .6
  • .43
  • .56
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0