MCQ Type Question for ISC Class-12 Chemistry Chapter-2 Solutions

MCQ Type Question for ISC Class-12 Chemistry Chapter-2 Solutions for your Semester 1 Exam of 2021-22. These MCQ  / Objective Type Questions is based on reduced syllabus according 2021-22 session on bifurcated pattern. Visit official website CISCE for detail information about ISC Board Class-12 Chemistry

MCQ / Objective Type Question of Ch-2 Solutions for ISC Class-12 Chemistry

Board ISC
Class  12th (XII)
Subject Chemistry
Chapter-2 Solutions
Syllabus  on bifurcated syllabus (after reduction)
Session 2021-22
Topic MCQ / Objective Type Question

 ISC Class-12 Chemistry MCQ / Objective Type Question of Ch-2 Solutions

Question 1 : If 2 gm of NaOH is present is 200 ml of its solution, its molarity will be

(a) 0.25
(b) 0.5
(c) 5
(d) 10

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer :(a) 0.25[/su_spoiler]

Question 2 : Which of the following fluoride is used as rat poison?
(a) CaF2
(b) KF
(c) NaF
(d) MgF2

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) NaF [/su_spoiler]

Question 3 : The osmotic pressure of a solution is directly proportional to
(a) the molecular concentration of the solute
(b) the absolute temperature at a given concentration
(c) the lowering of vapour pressure
(d) all the above.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (d) all the above. [/su_spoiler]

Question 4 :  Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is

(a) 0.46
(b) 0.40
(c) 0.20
(d) 0.36

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) 0.20 [/su_spoiler]

Question 5: The atmospheric pollution is generally measured in the units of
(a) mass percentage
(b) volume percentage
(c) volume fraction

(d) ppm

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (d) ppm [/su_spoiler]

Question 6:  Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 g of Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?

(a) 20
(b) 50
(c) 100
(d) 200

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) 50 [/su_spoiler]

Question 7:  Most of the processes in our body occur in
(a) solid solution
(b) liquid solution
(c) gaseous solution
(d) colloidal solution

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) liquid solution [/su_spoiler]

Question 7:  The term homogenous mixtures signifies that
(a) its composition is uniform throughout the mixture.
(b) its properties are uniform throughout the mixture.
(c) both composition and properties are uniform throughout the mixture.
(d) neither composition nor properties are uniform throughout the mixture.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) both composition and properties are uniform throughout the mixture. [/su_spoiler]

Question 8: Which of the following units is useful in relating concentration of solution with its vapour pressure?
(a) Mole fraction
(b) Parts per million
(c) Mass percentage
(d) Molality

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (a) Mole fraction[/su_spoiler]

Question 9: Isotonic solution are the solutions having the same.

(a) surface tension
(b) concentration
(c) osmotic pressure
(d) viscosity

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) osmotic pressure [/su_spoiler]

Question 10: Which of the following is a colligative property?
(a) osmotic pressure
(b) boiling point
(c) vapour pressure
(d) electrical conductivity

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (a) osmotic pressure [/su_spoiler]

Question 11: Which of the following solutions have highest freezing point?
(a) 0.1 M NaCl
(b) 0.1 M BaCl2
(c) 0.1 M Al2 (SO4)3
(d) 0.1 M urea.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (d) 0.1 M urea. [/su_spoiler]

Question 12: Which of the following 0.1 M aqueous solutions will have the lowest freezing point?
(a) potassium sulphate
(b) sodium chloride
(c) urea
(d) glucose

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (a) potassium sulphate [/su_spoiler]

Question 13: The mass of (COOH)2. 2H2O needed to prepare 500 ml of 0.1 molar solution is
(a) 12.6 gm
(b) 6.3 gm
(c) 4.5 gm
(d) 9.0 gm

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) 6.3 gm [/su_spoiler]

Question 14: Which of the following solutions has highest osmotic pressure?
(a) 1 M NaCl
(b) 1 M MgCl2
(c) 1 M urea
(d) 1M glucose.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (a) 1 M NaCl [/su_spoiler]

Question 15: Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are

(a) M, m
(b) F, x
(c) m, x
(d) M, x

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) m, x
[/su_spoiler]

Question 16: Which of the following condition is not satisfied by an ideal solution?

(a) ΔHmixing = 0
(b) ΔVmixing = 0
(c) Raoult’s Law is obeyed
(d) Formation of an azeotropic mixture

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (d) Formation of an azeotropic mixture
[/su_spoiler]

Question 17: 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.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) positive deviation from Raoult’s Law.
[/su_spoiler]

Question 18: Which has the lowest boiling point at 1 atm pressure?
(a) 0.1 M KCl
(b) 0.1 M Urea
(c) 0.1 M CaCl2
(d) 0.1 M A1Cl3

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) 0.1 M Urea [/su_spoiler]

Question 19: Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 gof Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?

(a) 20
(b) 50
(c) 100
(d) 200

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) 50
[/su_spoiler]

Question 20: 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) Ostawald’s dilution law

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) Raoult’s law
[/su_spoiler]

Question 21: 3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?
(a) 80 torr
(b) 140 torr
(c) 72 torr
(d) 70 torr

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) 72 torr
[/su_spoiler]

Question 22: Which of the following solutions shows positive deviation from Raoult’s law?
(a) Acetone + Aniline
(b) Acetone + Ethanol
(c) Water + Nitric acid
(d) Chloroform + Benzene

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) Acetone + Ethanol
[/su_spoiler]

Question 23: The system that forms maximum boilingazetrope is
(a) Acetone-chloroform
(b) ethanol-acetone
(c) n-hexane-n-heptane
(d) carbon disulphide-acetone

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (a) Acetone-chloroform [/su_spoiler]

Question 24: When a solute is present in trace quantities the following expression is used

(a) Gram per million
(b) Milligram percent
(c) Microgram percent
(d) Parts per million

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (d) Parts per million [/su_spoiler]

Question 25: The law which indicates the relation’-hip between solubility of a gas in liquid and pressure rs
(a) Raoult’s law
(b) Henry’s law
(c) Lowering of vapour pressure
(d) Van’t Hoff lawAnswer

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) Henry’s law
[/su_spoiler]

Question 26: Molarity of liquid HCl will be, if density of solution is 1.17 gm/cc
(a) 36.5
(b) 32.05
(c) 18.25
(d) 42.10

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) 32.05
[/su_spoiler]

Question 27: 1 M, 2.5 litre NaOH solution is mixed with another 0.5 M, 3 litre NaOH solution. Then find out the molarity of resultant solution
(a) 0.80 M
(b) 1.0 M
(c) 0.73 M
(d) 0.50 M

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) 0.73 M
[/su_spoiler]

Question 28: How much oxygen is dissolved in 100 rnL water at 298 K if partial pressure of oxygen is 0.5 atm and K = 1.4 × 10-3 mol/L/atm?
(a) 22.4 mg
(b) 22.4 g
(c) 2.24 g
(d) 2.24 mg

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (d) 2.24 mg [/su_spoiler]

Question 29: An X molal solution of a compound in benzene has mole fraction of solute equal to 0.2. The value of X is
(a) 14
(b) 3.2
(c) 1.4
(d) 2

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) 3.2 [/su_spoiler]

Question 30:  The molal elevation constant depends upon

(a) nature of solute.
(b) nature of the solvent.
(c) vapour pressure of the solution.
(d) enthalpy change.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) nature of the solvent.
[/su_spoiler]

Question 31: A plant cell shrinks when it is kept in a
(a) hypotonic solution
(b) hypertonic solution
(c) isotonic solution
(d) pure water

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) hypertonic solution
[/su_spoiler]

Question 32:  Azeotropic mixture of HCl and H2O has

(a) 48% HCl
(b) 22.2% HCl
(c) 36% HCl
(d) 20.2% HCl

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (d) 20.2% HCl
[/su_spoiler]

Question 33:  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.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) the extent of dissociation of solute. [/su_spoiler]

Question 34: The relative lowering in vapour pressure is proportional to the ratio of number of

(a) solute molecules to solvent molecules
(b) solvent molecules to solute molecules
(c) solute molecules to the total number of molecules in solution
(d) solvent molecules to the total number of molecules in solution

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) solute molecules to the total number of molecules in solution
[/su_spoiler]

Question 35: 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

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (a) 91.8 g
[/su_spoiler]

Question 36: What weight of glycerol should be added to 600 g of water in order to lower its freezing point by 10°C ?
(a) 496 g
(b) 297 g
(c) 310 g
(d) 426 g

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) 297 g
[/su_spoiler]

Question 37: 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

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) increasing the number of solute molecules [/su_spoiler]

Question 38: Henry’s law constant for molality of methane is benzene at 298 K is 4.27 × 105 mm Hg. The mole fraction of methane in benzene at 298 K under 760 mm Hg is

(a) 1.78 × 10-3
(b) 17.43
(c) 0.114
(d) 2.814

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (a) 1.78 × 10-3
[/su_spoiler]

Question 39:  Among the following substances the lowest vapour pressure is exerted by
(a) water
(b) alcohol
(c) ether
(d) mercury

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (d) mercury [/su_spoiler]

Question 40:  At equillibrium the rate of dissolution of a solid solute in a
volatile liquid solvent is __.
(a) less than the rate of crystallisation.
(b) greater than the rate of crystallisation.
(c) equal to the rate of crystallisation.
(d) zero

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) equal to the rate of crystallisation.
[/su_spoiler]

Question 41:  A beaker contains a solution of substance ‘A’. Precipitation of substance ‘A’ takes place when small amount of ‘A’ is added to the solution. The solution is __.
(a) saturated
(b) supersaturated
(c) unsaturated
(d) concentrated

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) supersaturated
[/su_spoiler]

Question 42:  Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon ________.
(a) Temperature
(b) Nature of solute
(c) Pressure
(d) Nature of solvent

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) Pressure
[/su_spoiler]

Question 43:  Low concentration of oxygen in the blood and tissues of people living at high altitude is due to _.
(a) low temperature
(b) low atmospheric pressure
(c) high atmospheric pressure
(d) both low temperature and high atmospheric pressure

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) low atmospheric pressure
[/su_spoiler]

Question 44:  Value of Henry’s constant KH _.
(a) increases with increase in temperature.
(b) decreases with increase in temperature.
(c) remains constant.
(d) first increases then decreases.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (a) increases with increase in temperature.
[/su_spoiler]

Question 45:  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.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) greater for gases with lower solubility. [/su_spoiler]

Question 46: Equimolar solutions in the same solvent have

(a) Same B.Ptbutdifferent F.Pt
(b) Same F. Pt, but different B.Pts.
(c) Same Boiling and same freezing point
(d) Different boiling and different freezing points.

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) Same Boiling and same freezing point
[/su_spoiler]

Question 47:The mole fraction of the solute in one molal aqueous solution is
(a) 0.027
(b) 0.036
(c) 0.018
(d) 0.019

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) 0.018
[/su_spoiler]

Question 48: The vapour pressure of the two liquids ‘P’ and ‘Q’ are 80 and 60 torr respectively. The total vapour pressure of the solution obtained by mixing 3 mol of P and 2 mole of Q would be
(a) 68 torr
(b) 140 torr
(c) 72 torr
(d) 20 torr

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (c) 72 torr
[/su_spoiler]

Question 49: X is dissolved in water. Maximum boiling point is observed when X is ………… (0.1 M each)
(a) CuSO4
(b) BaCl2
(c) NaCl
(d) Urea

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) BaCl2
[/su_spoiler]

Question 50: If an aqueous solution of glucose is allowed to freeze, then crystals of which substance will be separated and first?
(a) glucose
(b) water
(c) both of these
(d) none of these

[su_spoiler title=”Answer” style=”fancy” icon=”caret”]Correct Answer : (b) water
[/su_spoiler]

-: End of MCQ Type Question for ISC Class-12 Chemistry Chapter-2 Solutions :-

 

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