Download PDF
Free download in PDF CBSE Class 12 Chemistry Multiple Choice Questions(MCQs) & Answers. Here Gkseries provide Chemistry Solve Questions and Answers for CBSE Class 12 Students.
(1)
The molal elevation constant depends upon
[A]
nature of the solvent.
[B]
enthalpy change.
[C]
vapour pressure of the solution.
[D]
nature of solute.
Answer: nature of the solvent.
(2)
The van’t Hoff factor (i) accounts for
[A]
degree of solubilisation of solute.
[B]
the extent of dissociation of solute.
[C]
the extent of dissolution of solute.
[D]
the degree of decomposition of solution.
Answer: the extent of dissociation of solute.
(3)
People add sodium chloride to water while boiling eggs. This is to
[A]
increase the boiling point.
[B]
prevent the breaking of eggs.
[C]
decrease the boiling point.
[D]
make eggs tasty.
Answer: increase the boiling point.
(4)
Osmotic pressure of a solution is 0.0821 atm at a temperature of 300 K. The concentration in moles/litre will be
[A]
0.33
[B]
0.666
[C]
0.3 × 10-2
[D]
None
(5)
Which has the lowest boiling point at 1 atm pressure?
[A]
0.1 M Urea
[B]
0.1 M A1Cl3
[C]
0.1 M KCl
[D]
0.1 M CaCl2
(6)
The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows
[A]
no deviation from Raoult’s Law.
[B]
positive deviation from Raoult’s Law.
[C]
negative deviation from Raoult’s Law.
[D]
that the solution is unsaturated.
Answer: positive deviation from Raoult’s Law.
(7)
Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are
[A]
m, x
[B]
M, x
[C]
M, m
[D]
F, x
(8)
Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is
[A]
0.40
[B]
0.46
[C]
0.36
[D]
0.20
(9)
In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
[A]
Assertion and reason both are correct statements and reason is correct explanation for assertion.
[B]
Assertion and reason both are incorrect statements.
[C]
Assertion and reason both are correct statements but reason is not correct explanation for assertion.
[D]
Assertion is correct statement but reason is wrong statement.
Answer: Assertion and reason both are incorrect statements.
(10)
Relative lowering of vapour pressure is a colligative property because ________ .
[A]
It depends on the concentration of a non electrolyte solute in solution and does not depend on the nature of the solute molecules.
[B]
It depends on the concentration of an electrolyte or nonelectrolyte solute in solution as well as on the nature of solute molecules.
[C]
It depends on the concentration of a non electrolyte solute in solution as well as on the nature of the solute molecules.
[D]
It depends on number of particles of electrolyte solute in solution and does not depend on the nature of the solute particles.
Answer: It depends on the concentration of a non electrolyte solute in solution and does not depend on the nature of the solute molecules.
(11)
Benzoic acid, when dissolved in benzene, which of the following is correct.
[A]
The benzoic acid will undergo dissociation.
[B]
The benzoic acid will undergo association.
[C]
Observed molar mass of benzoic acid in benzene will less than normal molar mass.
[D]
Observed molar mass of benzoic acid in benzene is more than normal molar mass.
Answer: The benzoic acid will undergo association.
(12)
Which has the highest freezing point?
[A]
1 M glucose
[B]
1 M AlF3
[C]
1 M NaCl
[D]
1 M CaCl2
(13)
The temperature at which 10% aqueous solution of (W/V) of glucose will show the osmotic pressure of 16.4 atom is (R = 0.082 L atom K-1 mol-1)
[A]
360 K
[B]
300 K
[C]
180 K
[D]
360°C
(14)
If molality of dilute solution is doubled, the value of molal depression constant (Kf) will be
[A]
halved
[B]
tripled
[C]
unchanged
[D]
doubled
(15)
At 100°C, the vapour pressure of a solution of 6.5 g of solute in 100 g of water is 732 mm. If Kb is 0.52 K/m, the boiling point of solution will be [HOTS]
[A]
102°C
[B]
103°C
[C]
101 °C
[D]
100°C
(16)
When 1 mole of benzene is mixed with 1 mole of toluene (vapour pressure of benzene – 12.8 kPa, Toluene = 3.85 kPa)
[A]
The vapour will contain equal amount of benzene and toluene.
[B]
Not enough information is given for prediction.
[C]
The vapour will contain a higher percentage of benzene.
[D]
The vapour will contain higher percentage of toluene.
Answer: The vapour will contain a higher percentage of benzene.
(17)
What is mole fraction of solute in 1.00 m aqueous solution?
[A]
0.0354
[B]
0.0177
[C]
1.770
[D]
0.177
(18)
Cone. H2SO4 is 98 % H2SO4 by mass has d = 1.84 g cm-3. Volume of acid required to make one litre of 0.1 M H2SO4 is
[A]
30 mL
[B]
5.55 mL
[C]
10 mL
[D]
20 mL
(19)
A solution containing 10 g per dm3 of urea (molar mass 60 g mol-1) is isotonic with 5% solution of non-volatile solute, MB of solute is
[A]
250 g mol-1
[B]
300 g mol-1
[C]
350 g mol-1
[D]
200 g mol-1
(20)
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.
Answer: greater for gases with lower solubility.
Please share this page