Chemistry Solutions MCQs Chapter 9 Class 11 - PLS Academy

Chemistry Solutions MCQs – Chapter 9 Class 11

Chemistry Solutions is an important chapter of Class 11 Chemistry and plays a key role in FSc Part-I exams and entry test preparation. MCQs from this chapter are frequently included in MDCAT, NUMS, AKU, NUST, UET ECAT, and board examinations. This chapter covers essential topics such as types of solutions, concentration terms, solubility, colligative properties, Raoult’s law, osmotic pressure, and lowering of vapor pressure.

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Created on February 10, 2022 By Ali Durrani

Chemistry Ch 9 Class 11 Solution and Colloids

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1 / 52

The solubility product for BaSO4 , at 18-25°C is:

NTS 2015 DUHS and JSMU
Chemistry
Solution and Colloids
Elimination Tool:

A) 1.0 x 10-10mol2dm-6

B) 8.7 x 10-36mol2dm-6

C) 1.8 x 10-21mol2dm-6

D) 8.4 x 10-28mol2dm-6

2 / 52

Definition of Raoult’s law is,

The lowering of vapor pressure is equal to the mole fraction of solute

The relative lowering of vapor pressure is directly proportional to the mole fraction of solute.

The relative lowering of vapor pressure is equal to the mole fraction of solute

The relative lowering vapor pressure is equal to the mole fraction of solvent

3 / 52

Which of the following has the highest electrical conductivity?

NUMS 2016
Chemistry
Solution and Colloids
Elimination Tool:

A) Aqueous sugar solution

B) Solid graphite

C) Solid sodium chloride

D) Gaseous carbon dioxide

4 / 52

The osmotic pressure of equimolar solutions of BaCl2, NaCl and sucrose will be in the order:

NUMS 2016
Chemistry
Solution and Colloids
Elimination Tool:

A) Sucrose > NaCl > BaCl2

B) Sucrose > BaCl2 > NaCl

C) NaCl > BaCl2 > Sucrose

D) BaCl2 > NaCl > Sucrose

5 / 52

Which one is the correct formula for molar mass of solute In case of boiling point elevation? x

M2= 1000 Kb W2M1/ Tb W1

) M2= 1000 Kb W2/ Tb

M2 = Kb W1 Tb/1000

M2 =1000 Tb W21 Kb

6 / 52

Lowering of vapor pressure is directly proportional to?

Number of solute particles

Temperature

Chemical Formula

Number of solvent particle

7 / 52

Ca(OH)2 is sparingly soluble having solubility value 6.5 x 10-6. What’ll be its solubility:

UHS 2017 Reconduct
Chemistry
Solution and Colloids
Elimination Tool:

A) 2.75 x 10-2

B) 2.75 x 102

C) 1.17 x 10-2

D) 3.63 x 103

8 / 52

The temperature at which one crystalline form changes to other is called ___ temperature

PMC Sample 3
Chemistry
Solution and Colloids
Elimination Tool:

A) critical

B) absolute

C) transition

D) none of these

9 / 52

The aqueous solution of which of the following electrolyte will conduct electric current to large extent:

ETEA 2018
Chemistry
Solution and Colloids
Elimination Tool:

A) ??(??)2

B) ?2??3

C) N?4??

D) N?4?H

10 / 52

As the number of solute particles increases, the freezing point of the solution:

UHS 2012
Chemistry
Solution and Colloids
Elimination Tool:

A) Remains the same

B) Increases

C) First increases, then decreases

D) Decreases

11 / 52

Which one of the following statements is incorrect?

NUMS 2018
Chemistry
Solution and Colloids
Elimination Tool:

A) A solution freezes at a lower temperature than the pure solvent

B) A solution boils at a higher temperature than the pure solvent.

C) 0.1 M NaCl solution and 0.1 m sugar solution have the same boiling point

D) Osmosis cannot take place without a semi-permeable membrane.

12 / 52

6 g of urea is dissolved in 90 g of water. The relative lowering of vapour pressure is:

NUMS 2015
Chemistry
Solution and Colloids
Elimination Tool:

A) 0.02

B) 0.2

C) 0.002

D) 0.04

13 / 52

Which statement is correct?

PMC Sample 3
Chemistry
Solution and Colloids
Elimination Tool:

A) Amorphous solids have sharp melting Points

B) Amorphous solids have zero percent arranged

C) Amorphous Solids have a range of melting points

D) Amorphous solids have definite heat of fusion

14 / 52

At 25 C, the equivalent conductance at infinite dilution of HCl solution is 425 ohm 1 cm 2 Equiv 1 while its specific conductance is 3.825 ohm 1 cm 1. If the apparent degree of dissociation is 90%, the normality of the solution is:

NUMS 2016
Chemistry
Solution and Colloids
Elimination Tool:

A) 0.9 N

B) 1.0 N

C) 1.1 N

D) 1.2 N

15 / 52

Percentage of weight of NaCI if 2g NaCI is dissolved in 18g water

16 / 52

An azeotropic mixture of two liquids has a boiling point higher than either of them when it:

NUMS 2016
Chemistry
Solution and Colloids
Elimination Tool:

A) Shows positive deviation from Raoult’s law

B) Shows negative deviation from Raoult’s law

C) Shows ideal behaviour

D) Is saturated

17 / 52

12% W/W alcohol In water solution contains water:

100 cm3

12 cm3

88 cm3

112 cm3

18 / 52

The oxidation state of Cl in HClO4 is:

NTS 2019
Chemistry
Solution and Colloids
Elimination Tool:

A) -1

B) -5

C) +7

D) -7

19 / 52

What is the molality of 92 g toluene In 250 g benzene?

4 mol/kg

1 mol/kg

6mol/kg

3 mol/kg

20 / 52

From a mixture of CO2and H2gases, CO2can be separated by passing the mixture through:

NTS 2013
Chemistry
Solution and Colloids
Elimination Tool:

A) Water at high temperature

B) Water under high pressure

C) Cold water

D) Acidified water

21 / 52

The number of moles of solute dissolved per dm) of the solution is called

Molarity

Molality

Motality

Mole fraction

22 / 52

An ideal solvent dissolves maximum solute at?

Boiling point

At room temperature

Saturation point

At Freezing point

23 / 52

If NaCl produced in the equation:

FeCl3+ NaOH → Fe(OH)3 + NaCl

175.5 g of NaCl was dissolved in water to make a liter of solution, the molarity would be:

NTS 2010
Chemistry
Solution and Colloids
Elimination Tool:

A) 0.1 M

B) 3 M

C) 8 M

D) 12 M

24 / 52

The vapour pressure of water at room temperature is 23.8 mm Hg. The vapour pressure of an aqueous solution of sucrose with mole fraction 0.2 is equal to:

NUMS 2015
Chemistry
Stoichiometry
Solution and Colloids
Elimination Tool:

A) 19.04 mm Hg

B) 24.2 mm of Hg

C) 21.42 mm of Hg

D) 21.4 mm of Hg

25 / 52

Boiling point constants help us to determine:

UHS 2012
Chemistry
Solution and Colloids
Elimination Tool:

A) Molar masses

B) Volumes

C) Pressures

D) Masses

26 / 52

Colloidal particles can be separated by using:

ETEA 2017
Chemistry
Solution and Colloids
Elimination Tool:

A) Ordinary filter paper

B) Coarse filter paper

C) Fine Filter paper

D) Extremely fine filter paper

27 / 52

Colligative Properties depend upon: a

Solute

Solvent

Both a and b

None of these

28 / 52

Mole fraction of any compound is the ratio of moles of all components in a:

UHS 2011
Chemistry
Solution and Colloids
Elimination Tool:

A) Compound

B) Solution

C) Molecule

D) Solid

29 / 52

The amount of solute present in the given amount of solvent is called:

NTS 2017
Chemistry
Solution and Colloids
Elimination Tool:

A) Molarity

B) Molality

C) Concentration

D) Solubility

30 / 52

Lowering of vapor pressure Is directly proportional to: a)

Temperature

Mole fraction of Solute

Mole fraction of Solvent

Amount of solution

31 / 52

For colligative properties, the solution should be:

Electrolyte

Saturated

Diluted

Concentrated

32 / 52

Molal freezing point constant of water is:

UHS 2013
Chemistry
Solution and Colloids
Elimination Tool:

A) 1.86

B) 2.86

C) 11.86

D) 0.52

33 / 52

The oxidation state of Cl in HClO4 is:

NTS 2019
Chemistry
Solution and Colloids
Elimination Tool:

A) -1

B) +5

C) +7

D) -7

34 / 52

Aqueous solutions of Iodine and Sodium hydroxide were mixed in a round bottom flask at 70 C. Following chemical reaction was carried out.

3I2 + 6 NaOH -> NaIO3 + NaI + H2O
This reaction is termed as;

UHS 2019
Chemistry
Solution and Colloids
Elimination Tool:

A) Redox reaction

B) Precipitation reaction

C) Substitution reaction

D) Free radical reaction

35 / 52

Molarity is defined as the number of moles of any substance dissolved:

UHS 2011
Chemistry
Solution and Colloids
Elimination Tool:

A) Per dm3 of water

B) In one gram of water

C) Per m3 of water

D) In 100 ml of water

36 / 52

The formula of Plaster of Paris is:

NTS 2017
Chemistry
Solution and Colloids
Elimination Tool:

A) (CaSO4).1/2H2O

B) (CaSO4).5H2O

C) (CaSO4).7H2O

D) (CaSO4).9H2O

37 / 52

The elevation in boiling point ∆?? is equal to ebullioscopic constant ?? when the Molarity (?) of the solution is:

ETEA 2018
Chemistry
Solution and Colloids
Elimination Tool:

A) 0.1m

B) 1.0m

C) 10.0m

D) Statement is wrong

38 / 52

The pH of a solution can be kept constant by:

2022 PMC Test 2
Chemistry
Solution and Colloids
Elimination Tool:

A) saturated solution

B) super saturated solution

C) buffer solution

D) dilute solution

39 / 52

0.5 molar solution NaOH contains:

NUMS 2020
Chemistry
Solution and Colloids
Elimination Tool:

A) 40g NaOH in one dm3

B) 80g NaOH in one dm3

C) 10g NaOH in one dm3

D) 20g NaOH in one dm3

40 / 52

For a chemical reaction to occur, particles that collide should:

PMC 2021 Tested
Chemistry
Solution and Colloids
Elimination Tool:

A) Have proper orientations

B) Have proper energies

C) All of these

D) Be in a homogenous mixture

41 / 52

Buffer solutions resist change in their?

PMC Practice 6
Chemistry
Solution and Colloids
Elimination Tool:

A) Temperature

B) Solubility

C) Volatility

D) pH

42 / 52

Which of the following Is the smallest unit?

Molarity

Molality

PPM

Mole Fraction

43 / 52

Human blood maintains its pH between

UHS 2016
Chemistry
Solution and Colloids
Elimination Tool:

A) 6.50 – 7.00

B) 7.20 – 7.25

C) 7.50 – 7.55

D) 7.35 – 7.40

44 / 52

The properties of liquid crystals are intermediate b/w crystals and

PMC Sample 3
Chemistry
Solution and Colloids
Elimination Tool:

A) anisotropic liquids

B) nematic liquids

C) isotropic liquids

D) liquids

45 / 52

The reaction in which a molecule is broken down by Water is known as

Hydration

Salvation

Electrolysis

Hydrolysis

46 / 52

The value of surface tension of isopropyl alcohol is?

NUMS 2017
Chemistry
Solution and Colloids
Elimination Tool:

A) Less than water

B) Less than ethylene glycol

C) less than methyl alcohol

D) same as ethyl alcohol

47 / 52

In depression of freezing point, freezing constant Is divided by

Molarity

Molality

Molar fraction

All of these

48 / 52

Which of the following concentration unit is temperature dependent

ETEA 2019
Chemistry
Solution and Colloids
Elimination Tool:

A) Molality

B) Mole Fraction

C) Molarity

D) Both Molality and Molarity

49 / 52

The compound with more than 10% solubility in pure water is:

ETEA 2018
Chemistry
Solution and Colloids
Elimination Tool:

A) M???3

B) A?2(??3)3

C) K2??3

D) ????3

50 / 52

If 18.0 g of glucose is dissolved in 1 kg of water, boiling point of this solution should be:

UHS 2013
Chemistry
Solution and Colloids
Elimination Tool:

A) 100.52 °C

B) 100.00 °C

C) 100.052 °C

D) Less than 100 °C

51 / 52

Elevation of the boiling point is a ____ property.

PMC 2021 Tested
Chemistry
Solution and Colloids
Elimination Tool:

A) Colligative

B) None of these

C) Constitutive

D) Additive

52 / 52

The number of moles of solute dissolved per liter of solution is called:

NTS 2012
Chemistry
Solution and Colloids
Elimination Tool:

A) Normality

B) Molality

C) Mole fraction

D) Molarity

Your score is

The average score is 54%

Importance of Solutions MCQs

Understanding Solutions helps students solve numerical problems related to concentration, molarity, molality, and colligative properties. Exams often include MCQs on Raoult’s law, osmotic pressure, and other solution properties. Practicing chapter-wise MCQs improves accuracy, problem-solving skills, and confidence for competitive exams.

Effective Strategy for Free Preparation

For effective preparation, students should revise formulas and key concepts regularly, practice numerical problems step by step, and solve topic-wise MCQs consistently. Attempting free tests and past paper questions helps identify important concepts and repeated exam patterns. PLS Academy provides structured MCQs and free resources to support Chemistry Solutions preparation and other Class 11 Chemistry chapters.

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