Chapter 2 Solutions MCQs for Class 12 Chemistry

Chapter 2 Solutions MCQs for Class 12 Chemistry

Here students can practice Chapter 2 Solutions MCQs for Class 12 Chemistry. All the MCQs are divided into several sub-pages. Each page has 40 MCQs, for the next page just scroll down and click on the buttons. Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.

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Q 1.: What is the molality of a solution containing 200 mg of urea (molar mass 60 gm/mol) dissolved in 40 gm of water ?

(A) 0.083 

(B) 0.825

(C) 0.498

(D) 0.742

Option – A

Q 2.: The volume of ethyl alcohol (density 1.15 g/mL) that has to be added to prepare 100 mL of 0.5 M ethyl alcohol solution in water is :

(A) 1.15 mL

(B) 2.0 mL

(C) 2.15 mL

(D) 2.30 mL

Option – B

Q 3.: 16.02 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of solution is :

(A) 0.01 M 

(B) 0.001 M

(B) 0.2 M

(C) 0.1 M

Option – A

Q 4.: How many gram of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M nitric acid. The concentrated acid is 70% HNO3.

(A) 45.0 gm conc. nitric acid

(B) 50.0 gm conc. nitric acid

(C) 55.0 gm conc. nitric acid

(D) 60.0 gm conc. nitric acid

Option – A

Q 5.: The normality of orthophosphoric acid (H3PO4) having purity of 70% by weight and specific gravity 1.54 is:

(A) 11 N

(B) 22 N

(C) 33 N

(D) 44 N

Option – C

Q 6.: The molarity of H2SO4 solution, which has a density 1.84 gm/cc at 35 °C and contains 98 % by weight is :

(A) 1.84 M

(B) 18.4 M

(C) 2.68 M

(D) 26.8 M

Option – B

Q 7.: In which case Raoult’s Law is not applicable ?

(A) 1 M Sucrose

(B) 1 M Urea

(C) 1 M Glucose

(D) 1 M Sodium Chloride

Option – D

Q 8.: PA and PB are the vapour pressure of pure liquid components A and B respectively of an ideal binary solution. If ‘XA‘ represents the mole fraction of component ‘A’, the total vapour pressure of the solution will be:

(A) PA + XA (PB − PA)

(B) PA + XA (PA − PB)

(C) PB + XA (PB − PA)

(D) PB + XA (PA − PB)

Option – D

Q 9.: Which of the following will show a negative deviation from Raoult’s law ?

(A) Acetone – Benzene

(B) Acetone – Ethanol

(C) Benzene – Methanol

(D) Acetone – Chloroform

Option – D

Q 10.: Which one of the following gas has the lowest value of Henry’s law constant ?

(A) N2

(B) He

(C) CO2

(D) O2

Option – C

Q 11.: A solution of two liquids boils at a temperature more than the boiling point of either of them. Hence, the binary solution shows:

(A) Negative deviation from Raoult’s law

(B) Positive deviation from Raoult’s law

(C) No deviation from Raoult’s law

(D) Positive or Negative deviation from Raoult’s law depending upon the composition.

Option – A

Q 12.: Choose the correct statement. When concentration of a salt solution increased:

(A) Boiling point decreases while vapour pressure increases. 

(B) Boiling point increases while vapour pressure decreases.

(C) Freezing point decreases while vapour pressure increases. 

(D) Freezing point increases while vapour pressure decreases. 

Option – B

Q 13.: Lowering of vapour pressure of an aqueous solution of a non-volatile, non-electrolyte 1 molal aqueous solution at 100 °C is:

(A) 14.12 torr

(B) 31.2 torr

(C) 13.45 torr

(D) 35.2 torr

Option – C

Q 14.: Out of the following 0.10 molal aqueous solutions, which one will exhibit the largest freezing point depression ?

(A) KCl

(B) K2SO4

(C) C6H12O6

(D) Al2(SO4)3

Option – D

Q 15.: The colligative property is not represented by :

(A) Elevation in boiling point

(B) Osmotic pressure

(C) Optical activity

(D) Relative lowering of vapour pressure

Option – C

Q 16.: The osmotic pressure of 12% solution of cane-sugar at 17 °C is:

(A) 2.42 atm

(B) 4.33 atm

(C) 8.35 atm

(D) 16.30 atm

Option – C

Q 17.: What mass of non-volatile solute (molar mass = 40 gm/mol) should be dissolved in 114 gm of octane to lower its vapour pressure by 20% ?

(A) 9.8 gm

(B) 10.0 gm

(C) 11.4 gm

(D) 12.8 gm

Option – B

Q 18.: What is the freezing point of a solution containing 8.1 gm HBr in 100 gm water ?Assuming the acid to be 90% ionised (given Kf for water = 1.86 K/mol).

(A) +0.35 

(B) −0.35

(C) +3.54

(D) −3.54

Option – D

Q 19.: The molar concentration of the solution having osmotic pressure 0.0821 atm at 300 K will be:

(A) 3.0

(B) 0.3

(C) 0.03

(D) 0.003

Option – C

Q 20.: During the depression of freezing point experiment an equilibrium is established between the molecules of :

(A) Liquid solvent and solid solvent

(B) Liquid solute and solid solvent

(C) Liquid solute and solid solute

(D) Liquid solvent and solid solute

Option – A

Q 21.: The molar mass of the solute NaOH obtained from the measurement of the osmotic pressure of its aqueous solution at 27 °C is 25 gm/mol. Therefore its ionisation percentage in this solution is :

(A) 50%

(B) 60%

(C) 70%

(D) 80% 

Option – B

Q 22.: Which of the following pair of solutions are expected to be isotonic at the same temperature ?

(A) 0.2 M urea and 0.2 M NaCl

(B) 0.1 M urea and 0.2 M MgCl2

(C) 0.1 M NaCl and 0.1 M Na2SO4

(D) 0.1 M Ca(NO3)2 and 0.1 M Na2SO4

Option – D

Q 23.: The relative lowering of vapour pressure is equal to the ratio between the number of

(A) Solute molecules to the solvent molecules

(B) Solute molecules to the total molecules in the solution

(C) Solvent molecules to the total molecules in the solution

(D) Solvent molecules to the total number of ions of the solute.

Option – B

Q 24.: Relative lowering of vapour pressure of a dilute solution is 0.2. What is the mole fraction of the non-volatile solute ?

(A) 0.8 

(B) 0.5

(C) 0.3

(D) 0.2

Option – D

Q 25.: The mass of glucose that should be dissolved in 50 gm of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 gm of urea in the same quantity of water is :

(A) 1 gm

(B) 3 gm

(C) 6 gm

(D) 18 gm

Option – B

Q 26.: The freezing point of 1 % solution of lead nitrate in water will be :

(A) 2 °C

(B) 1 °C 

(C) 0 °C

(D) below 0 °C

Option – D

Q 27.: A solution containing 10 gm per dm3 of urea (molar mass = 60 gm/mol) is isotonic with a 5% solution of a non-volatile solute. The molecular mass of this non-volatile solute is :

(A) 300 gm/mol

(B) 250 gm/mol

(C) 350 gm/mol

(D) 270 gm/mol

Option – A

Q 28.: Which has the least freezing point ?

(A) 1 % C12H22O11

(B) 1 % KCl

(C) 1 % CaCl2

(D) 1 % C6H12O6

Option – C

Q 29.: Which one of the statement given below concerning properties of solution, describe a colligative effect ?

(A) Boiling point of pure water decreases by the addition of ethanol.

(B) Vapour pressure of pure water decreases by the addition of nitric acid.

(C) Vapour pressure of pure benzene decreases by the addition of naphthalene.

(D) Boiling point of pure benzene increases by addition of toluene.

Option – C

Q 30.: The van’t Hoff factor (i) for a compound which undergoes dissociation in one solvent and association in other solvent is respectively:

(A) Greater than one and less than one

(B) Less than one and greater than one

(C) Greater than one and greater than one

(C) Less than one and less than one

Option – A

Q 31.: 138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is.

(A) 1 : 4

(B) 1 : 2

(C) 3 : 4

(D) 1 : 1

Option – C

Q 32.: How many grams of sulphuric acid is to be dissolved to prepare 200 mL aqueous solution having concentration of H3O+ ions 1 Molar at 25 °C ?

(A) 4.9 gm

(B) 9.8 gm

(C) 12.6 gm

(D) 19.6 gm

Option – B

Q 33.: Mole fraction of the solute in a 1 molal aqueous solution is :

(A) 1.77

(B) 0.177

(C) 0.0177

(D) 0.0344

Option – C

Q 34.: 25.3 grams of sodium carbonate (Na2CO3) is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion and carbonate and are respectively?

(A) 0.477 M and 0.477 M

(B) 0.955 M and 1.910 M

(C) 1.90 M and 1.910 M

(D) 1.910 M and 0.955 M 

Option – D

Q 35.: 2.5 cm3 of 0.2 M H2SO4 solution is diluted to 0.5 dm3. Find normality of the diluted solution.

(A) 0.002 M

(B) 0.02 M

(C) 0.2 M

(D) 2.0 M

Option – A

Q 36.: 4.0 gm of NaOH is dissolved in 100 mL solution. The normality of the solution is:

(A) 0.1 N

(B) 0.5 N

(C) 4.0 N

(D) 1.0 N

Option – D

Q 37.: Calculate the mass of urea (NH2CONH2) required in making 2.5 Kg of 0.25 molal aqueous solution.

(A) 37.5 gm

(B) 53.7 gm

(C) 73.5 gm

(D) 75.3 gm

Option – A

Q 38.: What is the mole fraction of benzene in solution containing 30 % by mass in CCl4 ?

(A) 1.459 

(B) 0.459

(C) 4.159

(D) None of these

Option – B

Q 39.: 50 cm3 of 0.2 N HCl is titrated against 0.1 N NaOH solution. The titration is discontinued after adding 50 cm3 of NaOH. The remaining titration is completed by adding 0.5 N KOH. The volume of KOH required for completing the titration is.

(A) 12 mL

(B) 10 mL

(C) 8 mL

(D) 5mL

Option – B

Q 40.: The molarity of a solution containing 5.0 gm of NaOH in 250 mL solution is :

(A) 0.1 M

(B) 0.2 M

(C) 0.4 M

(D) 0.5 M

Option – D

Pagination

We hope that these Chapter 2 Solutions MCQs for Class 12 Chemistry helped you in learning new concepts. All questions are based on NCERT syllabus and some of them have been asked in various competitive exams. You can go to the next pages to practice more for Chapter 2 Solutions MCQs for Class 12 Chemistry, click on the question range given above.

Also you can practice Class 12 Chemistry MCQs (Multiple Choice Questions) for other units.