Please refer to Chapter 2 Solutions MCQ Class 12 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Chemistry. Students should refer to MCQ Questions for Class 12 Chemistry with Answers to score more marks in Grade 12 Chemistry exams. Students should read the chapter Solutions and then attempt the following objective questions.

MCQ Questions Class 12 Chemistry Chapter 2 Solutions

The Solutions MCQ Class 12 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. 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

Question. Which of the following is a quantitative description of the solution?     
(a) Dilute
(b) Concentrated
(c) Saturated
(d) Molar

Question. 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

Question. Iodine and sulphur dissolve in             
(a) water
(b) benzene
(c) carbon disulphide
(d) ethanol

Question. The liquids at a given temperature vapourise and under equilibrium conditions the pressure exerted by the vapours of the liquid over the liquid phase is called         
(a) osmotic pressure
(b) atmospheric pressure
(c) hydrostatic pressure
(d) vapour pressure

Question. The vapour pressure of the solution at a given temperature is found to be …………… than the vapour pressure of the pure solvent at the same temperature.           
(a) higher
(b) lower
(c) equal
(d) can’t calculate

Question. The decrease in the vapour pressure of solvent depends on the               
(a) quantity of non-volatile solute present in the solution
(b) nature of non-volatile solute present in the solution
(c) molar mass of non-volatile solute present in the solution
(d) physical state of non-volatile solute present in the solution

Question. Which of the following liquid pairs shows a positive             
deviation from Raoult’s law ?
(a) Water – Nitric acid
(b) Benzene – Methanol
(c) Water – Hydrochloric acid
(d) Acetone – Chloroform 

Question. A solution of acetone in ethanol           
(a) shows a positive deviation from Raoult’s law
(b) behaves like a non ideal solution
(c) obeys Raoult’s law
(d) shows a negative deviation from Raoult’s law

Question. Negative deviation from Raoult’s law is observed in which one of the following binary liquid mixtures?     
(a) Ethanol and acetone
(b) Benzene and toluene
(c) Acetone and chloroform
(d) Chloroethane and bromoethane

Question. Which one of the following binary liquid systems shows positive deviation from Raoult’s law?         
(a) Benzene-toluene
(b) Carbon disulphide-acetone
(c) Phenol-aniline
(d) Chloroform-acetone

Question. An ideal solution is formed when its components           
(a) have no volume change on mixing
(b) have no enthalpy change on mixing
(c) Both (a) and (b) are correct
(d) Neither (a) nor (b) is correct

Question. Which is an application of Henry’s law?           
(a) Spray paint
(b) Bottled water
(c) Filling up atire
(d) Soft drinks (soda)

Question. Scuba divers may experience a condition called ______. To avoids this, the tanks used by scuba divers are filled with air diluted with _____ .       
(a) Migrains, Hydrogen
(b) Cramps, Nitrogen
(c) Nausea, Oxygen
(d) Bends, Helium

Question. Sprinkling of salt helps in clearing the snow covered roads in hills. The phenomenon involved in the process is         
(a) lowering in vapour pressure of snow
(b) depression in freezing point of snow
(c) melting of ice due to increase in temperature by putting salt
(d) increase in freezing point of snow

Question. The values of Van’t Hoff factors for KCl, NaCl and K₂SO₄, respectively, are       
(a) 2, 2 and 2
(b) 2, 2 and 3
(c) 1,1 and 2
(d) 1, 1 and 1

Question. 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

Question. At equilibrium 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

Question. 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

Question. 4 L of 0.02 M aqueous solution of NaCl was diluted by adding one litre of water. The molality of the resultant solution is       
(a) 0.004
(b) 0.008
(c) 0.012
(d) 0.016

Question. What will be the degree of dissociation of 0.1 M Mg(NO₃)₂ solution if van’t Hoff factor is 2.74?         
(a) 75%
(b) 87%
(c) 100%
(d) 92%

Question. The density of a solution prepared by dissolving 129g of urea in 1000g of water is 1.15g/ml. The molarity of this solution is         
(a) 1.78M
(b) 1.02M
(c) 2.05M
(d) 0.50M

Question. Colligative properties depend on                 
(a) the nature of the solute particles dissolved in solution.
(b) the number of solute particles in solution.
(c) the physical properties of the solute particles dissolved in solution.
(d) the nature of solvent particles.

Question. Mixing up equal volumes of 0.1M NaOH and 0.1M CH₃COOH yields a solution which is           
(a) basic
(b) acidic
(c) neutral
(d) None

Question. 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

Question. Which of the following concentration terms is/are independent of temperature?
(a) Molality only
(b) Molality and mole fraction
(c) Molarity and mole fraction
(d) Molality and normality

Question. The mass of a non-volatile solute of molar mass 40 g mol^-1 that should dissolved in 114 g of octane to lower its vapour pressure by 20%, is 
(a) 11.4 g
(b) 9.8 g 
(c) 12.8 g
(d) 10 g

Question. 58.5 g of NaCl and 180 g of glucose were separately dissolved in 1000 mL of water. Identify the correct statement regarding the elevation of boiling point (b.p.) of the resulting solutions.
(a) NaCl solution will show higher elevation of boiling
(b) Glucose solution will show higher elevation of boiling point
(c) Both the solutions will show equal elevation of boiling point.
(d) The boiling point elevation will be shown by neither of the solutions.

Question. How many grams of dibasic acid (mol. wt. 200) should be present in 100 mL of the aqueous solution to give 0.1 N?
(a) 10 g
(b) 20 g 
(c) 2 g
(d) 1 g

Question. Ethylene glycol is used as an antifreeze in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at – 6°C will be (K_f for water= 1.86 K kg mol^-1 and molar mass of ethylene glycol = 62 g mol^-1 ) 
(a) 804.32 g
(b) 204.30 g
(c) 400.00 g
(d) 304.60 g

Question. The empirical formula of a non-electrolyte is CH₂O. A solution containing 3 g of the compound exerts the same osmotic pressure as that of 0.05 M glucose solution. The molecular formula of the compound is 
(a) CH₂O
(b) C₂H₄O₂
(c) C₄H₈O₄
(d) C₃H₆O₃

Question. At 25°C a 5% aqueous solution of glucose (molecular weight = 180 g mol^-1 ) is isotonic with 2% aqueous solution containing an unknown solute. What is the molecular weight of the unknown solute. 
(a) 60
(b) 80 
(c) 72
(d) 63
(e) 98

Question. A solution containing 1.8 g of a compound (empirical fommla CH₂O) in 40 g of water is observed to freeze at – 0.465°C. The molecular formula of the compound is (K I of water= 1.86 kg Kmol^-1)
(a) C₂H₄O₂
(b) C₃H₆O₃
(c) C₄H₈O₄
(d) C₅H₁₀O₅
(e) C₆H₁₂O₆

Question. Choose the correct statement. When concentration of a salt solution is increased
(a) Boiling point increases while vapour pressure decreases.
(b) Boiling point decreases while vapour pressure increases.
(c) Freezing point decreases while vapour pressure increases.
(d) Freezing point increases while vapour pressure decreases.

Question. The highest osmotic pressure corresponds to the following solution 
(a) M / 10 urea
(b) M / 10 glucose
(c) M / 10 HCl
(d) M / 10 BaCl₂

Question. The correct order of increasing boiling points of the following aqueous solutions 0.0001 M NaCl(I), 0.0001 M Urea(II), 0.001 M MgC_l2 (III), O.Ql M NaCl (IV) is
(a) I < II < III< IV
(b) IV < III < II < I
(c) II < I < III < IV
(d) III < II < IV < I

Question. The freezing point (in °C) of solution containing 0.1 g of K₃ [Fe(CN)₆ ](mol. wt. 329) in 100 g of water (K_f = 1. 86 K kg mol^-1 ) is 
(a) -2.3 x 10^-2
(b) -5.7 x l0^-2
(c) – 5. 7 X 10^-3
(d) – 1.2 X 10^-2

Question. The elevation in boiling point would be highest for
(a) 0.08 M BaCl₂
(b) 0.15 M KCl
(c) 0.10 M glucose
(d) 0.06 M Ca(NO₃ )₂

Question. Formation of a solution from two components can be considered as
I pure solvent ➔ separated solvent molecules, ΔH₁
II pure solute ➔ separated solute molecules, ΔH₂
III separated solvent and solute molecules ➔ solution, ΔH₃ Solution so fonned will be ideal if 
(a) ΔH_soln = ΔH₁ – ΔH₂ – ΔH₃
(b) ΔH_soln = Aff 3 – ΔH₁ – ΔH₂
(c) ΔH_soln = ΔH₁ + ΔH₂ + ΔH₃
(d) ΔH_soln = ΔH₁ + ΔH₂ – ΔH₃         

Question. On a humid day in summer, the mole fraction of gaseous H₂O (water vapour) in the air at 25°C can be as high as 0.0287. Assuming a total pressure of 0.977 atm. What is the partial pressure of dry air? 
(a) 94.9 atm
(b) 0 .949 atm
(c) 949 atm
(d) 0.648 atm
(e) l.248 atm       

Question. The vapour pressure of two liquids X and Y are 80 and 60 Torr respectively. The total vapour pressure of the ideal solution obtained by mixing 3 moles of X and 2 moles of Y would be
(a) 68 torr
(b) 140 torr
(c) 48 torr
(d) 72 torr
(e) 54 torr       

Question. At 25°C, the total pressure ofan ideal solution obtained by mixing 3 moles of’A’ and 2 moles of’B’, is 184 torr. What is the vapour pressure (in torr) of pure ‘B’ at the same temperature ? (Vapour pressure of pure ‘A’ at 25°C is 200 torr)
(a) 180
(b) 160
(c) 16
(d) 100     

Question. Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure ofbenzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20°C for a solution containing 78 g of benzene and 46 g of toluene in torr is 
(a) 53.5
(b) 37.5
(c) 25
(d) 50     

Question. A and B are ideal gases. The molecular weights of A and B are in the ratio of 1 : 4. The pressure of a gas mixture containing equal weights of A and B is p atm. What is the partial pressure (in atm) of Bin the mixture? 
(a) p/5
(b) P/2
(c) p/2.5
(d) 3P/4       

Question. One component of a solution follows Raoult’s law over the entire range 0≤ x₁ ≤ L The second component must follow Raoult’s law in the range when x2 is 
(a) close to zero
(b) close to 1
(c) 0≤ x₂ ≤0.5
(d) 0≤ x₂ ≤1     

Question. In a mixture of A and B, components show negative deviation when 
(a) A — B interaction is stronger than A — A and B — B interaction
(b) A — B interaction is weaker than A — A and B — B interaction
(c) ΔV _mix > 0, Δs_mix > 0
(d) ΔV _mix = 0, ΔS_mix > 0       

Question. The relative lowering of vapour pressure of a dilute aqueous solution containing non-volatile solute is 0.0125. The molality of the solution is about 
(a) 0.70
(b) 0.50
(c) 0.90
(d) 0.80

Question. At25°C, the highest osmotic pressure is exhibited by 0.1 M solution of 
(a) urea
(b) glucose
(c) KCl
(d) CaCl₂

Question. A 6% solution of urea is isotonic with
(a) 1 M solution of glucose
(b) 0.05 M solution of glucose
(c) 6% solution of glucose
(d) 25% solution of glucose

Question. The vapour pressure of pure liquid A is 0.80 atm. When a non-volatile B is added to A its vapour pressure drops to 0.60 atm. The mole fraction of B in the solution is
(a) 0.125
(b) 0.25
(c) 0.5
(d) 0.75

Question. Colligative properties of a solution depends upon
(a) natw-e of both solvent and solute
(b) nature of solute only
(c) number of solvent particles
(d) the number of solute particles

Question. At a constant temperature, which of the following aqueous solutions will have the maxirmun vapour pressure ?
(Mol. wt. NaCl= 58.5, H₂SO₄ = 98.0 g · mol^-1)
(a) 1 molal NaCl (aq) 
(b) 1 molar NaCl (aq)
(c) 1 molal H₂SO₄ (aq)
(d) 1 molar H₂SO₄ (aq)

Question. Highest boiling point is found in 
(a) 0.1 M NaCl
(b) 0.1 M BaCl₂
(c) 0.1 M sucrose
(d) 0.1 M KCI

Question. The difference between the boiling point and freezing point of an aqueous solution containing sucrose (mol. wt.= 342 g mol^-1 ) in 100 g of water is 105.0°C. If K I and Kb ofwater are 1.86 and 0.51 K kg mol^-1 respectively, the weight of sucrose in the solution is about 
(a) 34.2 g
(b) 342 g
(c) 7.2 g
(d) 72 g
(e) 68.4 g

Question. A solution is prepared by dissolving 10 g NaOH in 1250 mL of a solvent of density 0.8 mL/g. The molality of the solution in mol kg–1 is 
(a) 0.25
(b) 0.2
(c) 0.008
(d) 0.0064

Question. Which of the following is a quantitative description of the solution?           
(a) Dilute
(b) Concentrated
(c) Saturated
(d) Molar

Question. At equilibrium 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

Question. Atomic mass is equal to             
(a) number of electrons of an atom
(b) sum of the numbers of electrons and protons of an atom
(c) sum of the numbers of neutrons and protons of an atom
(d) none of these

Question. Which of the following binary mixtures will have same composition in liquid and vapour phase?           
(a) Benzene – Toluene
(b) Water-Nitric acid
(c) Water-Ethanol
(d) n-Hexane – n-Heptane

Question. Chloroform and acetone are added to each other, Raoult’s law shows negative deviation.what does this suggests ?     
(a) Exothermic reaction
(b) Endothermic reaction
(c) Zero change in enthalpy
(d) None of these

Question. 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

Question. 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

Question. Colligative properties are observed when ___________.             
(a) a non volatile solid is dissolved in a volatile liquid.
(b) a non volatile liquid is dissolved in another volatile liquid.
(c) a gas is dissolved in non volatile liquid.
(d) a volatile liquid is dissolved in another volatile liquid.

Question. The value of Henry’s constant K_H 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.

Question. 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

Question. 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

Question. 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

Question. 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.

Question. Blood cells retain their normal shape in solution which are           
(a) hypotonic to blood
(b) isotonic to blood
(c) hypertonic to blood
(d) equinormal to blood.

Question. Isotonic solutions have same                 
(a) molar concentration
(b) molality
(c) normality
(d) None of these

Question. As a result of osmosis, the volume of more concentrated solution             
(a) gradually decreases
(b) gradually increases
(c) is not affected
(d) suddenly increases

Question. If 0.1 M solution of glucose and 0.1 M solution of urea are placed on two sides of the semipermeable membrane to equal heights, then it will be correct to say that         
(a) there will be no net movement across the membrane
(b) glucose will flow towards urea solution
(c) urea will flow towards glucose solution
(d) water will flow from urea solution to glucose

Question. The van’t Hoff factor i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively       
(a) less than one and greater than one.
(b) less than one and less than one.
(c) greater than one and less than one.
(d) greater than one and greater than one.

Question. According to Raoult’s law, relative lowering of vapour pressure for a solution is equal to         
(a) moles of solute
(b) moles of solvent
(c) mole fraction of solute
(d) mole fraction of solvent

Question. During osmosis, flow of water through a semipermeable membrane is                 
(a) from both sides of semipermeable membrane with equal flow rates
(b) from both sides of semipermeable membrane with unequal flow rates
(c) from solution having lower concentration only
(d) from solution having higher concentration only

Question. The relative lowering of the 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.

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

Question. 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

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