NEET Chemistry Solutions MCQs Set A

Question: The normality of 10% (weight/volume) acetic acid is

• a) 1 N
• b) 10 N
• c) 1.7 N
• d) 0.83 N

Answer: 1.7 N

Question: 20 ml of 0.5 M HCl is mixed with 30 ml of 0.3 M HCl the molarity of resulting solution is

• a) 0.8 M
• b) 0.53 M
• c) 0.38 M
• d) 0.83 M

Answer: 0.38 M

Question:  20 ml of 0.2 M Al₂(SO₄)₃ is mixed with 20 ml of 6.6 M BaCl₂ , the concentration of Cl^– ion in solution is

• a) 0.2 M
• b) 6.6 M
• c) 0.02 M
• d) 0.06 M

Answer: 6.6 M

Question: The expression relating molarity (M) of a solution with its molality (m) is (where d = density, MBmol. wt. of solute)

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: If solubility of any gas in the liquid at 1 bar pressure is 0.05 mol/lit. What will be its solubility at 3 bar pressure, keeping the temperature constant ?

• a)

  

• b) 0.15 mol/lit
• c) 0.05 mol/lit
• d) 1.0 mol/lit

Answer: 0.15 mol/lit

Question:  The boiling points of C₆H₆, CH₃OH, C₆H₅NH₂ and C₆H₅NO₂ are 80^oC, 65^oC, 184^oC and 212^oC respectively. Which of the following will have highest vapour pressure at room temperature?

• a) C₆H₆
• b) CH₃OH
• c) C₆H₅NH₂
• d) C₆H₅NO₂

Answer: CH₃OH

Question: The highest temperature at which vapour pressure of any liquid can be measured is

• a) Critical temperature
• b) Boyle’s temperature
• c) Boiling point of the liquid
• d) Kraft temperature

Answer: Boiling point of the liquid

Question: If solute and solvent interactions are more than solute - solute and solvent - solvent interactions then

• a) It is ideal solution
• b) It is non-ideal solution with positive deviation
• c) It is non-ideal solution with negative solution
• d) Can't predicted

Answer: It is non-ideal solution with negative solution

Question: Which of the following is correct about a solution showing positive deviation?

• a) Vapour pressure observed will be the less than that calculated from Raoult’s law
• b) Minimum boiling azeotrope will be formed
• c) ΔH_mix< 0
• d) ΔV_mix< 0

Answer: Minimum boiling azeotrope will be formed

Question:  If C₂H₅OH and H₂O solution is example of non-ideal solution then which graphical representation is correct?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  If P⁰ and P are the vapour pressure of solvent and solution n₁ and n₂ are the moles of solute and solvent then

• a)

  

• b)

  

• c)

  

• d)  P^º = P × n₁

Answer:

Question: Which of the following statement is true?

• a) Molarity of solution is independent of temperature
• b) Molality of solution is independent of temperature
• c) Mole fraction of solute is dependent on temperature
• d) The unit of molality is mol dm^–3

Answer: Molality of solution is independent of temperature

Question: Among the following mixtures, dipole-dipole as the major interaction, is present in

• a) Benzene and CCl₄
• b) Benzene and C₂H₅OH
• c) CH₃COCH₃ and CH₃CN
• d) KCl and water

Answer: CH₃COCH₃ and CH₃CN

Question:   For an ideal solution with  which of the following is true?

• a)

  

• b)

  

• c)

  

• d) No relationship in their mole fraction

Answer:

Question: An azeotropic solution of two liquids has a boiling point lower than either of the boiling points of the two liquids when it

• a) Shows negative deviation
• b) Shows positive deviation
• c) Shows no deviation
• d) Is unsaturated

Answer: Shows positive deviation

More Questions........................................................

Question:   The vapour pressure of a solution having 2.0 g of solute X (molar atomic mass = 32 g mol^–1) in 100 g of CS₂(vapourpressure = 854 torr) is 848.9 torr. The molecular formula of the solute is

• a) X
• b) X₂
• c) X₄ 
• d) X₈

Answer:  X₈

Question: Two solutions of a non-electrolyte are mixed in the following manner. 480 mL of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final solution?

• a) 1.344 M
• b) 2.70 M
• c) 1.20 M
• d) 1.50 M

Answer: 1.344 M

Question: A pressure cooker reduces cooking time for food because

• a) Cooking involves chemical changes helped by a rise in temperature
• b) Heat is more evenly distributed in the cooking space
• c) Boiling point of water involved in cooking is increased
• d) The higher pressure inside the cooker crushes the food material

Answer: Boiling point of water involved in cooking is increased

Question: Equal moles of benzene and toluene are mixed the V.P. of benzene and toluene in pure state are 700 and 600 mm Hg respectively. The mole fraction of benzene in vapour state is

• a) 0.7
• b) 0.47
• c) 0.50
• d) 0.54

Answer: 0.54

Question: The vapour pressure of a solvent decreased by 10 mm of Hg when a non-volatile solute was added to the solvent. The mole fraction of solute in solution is 0.2, what would be the mole fraction of solute if decrease in vapour pressure is 20 mm of Hg?

• a) 0.8
• b) 0.6
• c) 0.4
• d) 0.2

Answer: 0.4

Question: Calculate the mole fraction of toluene in the vapour phase which is in equilibrium with a solution of benzene and toluene having a mole fraction of toluene 0.5. (The vapour pressure of pure Benzene is 119 torr and that of toluene is 37 torr at the same temperature)

• a) 0.5
• b) 0.75
• c) 0.625
• d) 0.237

Answer: 0.237

Question: An ideal solution was obtained by mixing methanol and ethanol. If the partial vapour pressure of methanol and ethanol are 2.619 kPa and 4.556 kPa respectively, the composition of vapour (in terms of mole fraction) will be

• a) 0.635 MeOH, 0.365 EtOH
• b) 0.365 MeOH, 0.635 EtOH
• c) 0.574 MeOH, 0.326 EtOH
• d) 0.173 MeOH, 0.827 EtOH

Answer: 0.365 MeOH, 0.635 EtOH

Question: The vapour pressure of a dilute aqueous solution of glucose is 750 mm Hg at 373 K. Calculate the mole fraction of solute. (The vapour pressure of pure water is 760 mm Hg at 373 K)

• a) 0.013
• b) 1.3
• c) 0.13
• d) 1.1

Answer: 0.013

Question:  Two liquids having vapour pressures P₁⁰ and P₂⁰ in pure state in the ratio of 2 : 1 are mixed in the molar ratio of 1 : 2. The ratio of their moles in the vapour state would be

• a) 1 : 1
• b) 1 : 2
• c) 2 : 1
• d) 3 : 2

Answer: 1 : 1

Question: In ideal solution of non volatile solute B in solvent A in 2 : 5 molar ratio has vapour pressure 250 mm. If a another solution in ratio 3 : 4 prepared then vapour pressure above this solution

• a) 200 mm
• b) 250 mm
• c) 350 mm
• d) 400 mm

Answer: 200 mm

Question: In the case of osmosis, solvent molecules move from solution having

• a) Higher vapour pressure to lower vapour pressure
• b) Higher concentration to lower concentration
• c) Lower vapour pressure to higher vapour pressure
• d) Higher osmotic pressure to lower osmotic pressure

Answer: Higher vapour pressure to lower vapour pressure

Question: Equimolar solution of non-electrolyte in the same solvent have

• a) Same boiling point and same freezing point
• b) Different boiling point and different freezing point
• c) Same boiling point but different freezing point
• d) Same freezing point but different boiling point

Answer: Same boiling point and same freezing point

Question: In the phenomenon of osmosis through the semipermeable membrane

• a) Solvent molecules pass from solution to solvent
• b) Solvent molecules pass from solvent to solution
• c) Solute molecules pass from solution to solvent
• d) Solute molecules pass from solvent to solution

Answer: Solvent molecules pass from solvent to solution

Question:  The osmotic pressure of 0.1 M sodium chloride solution at 27°C is

• a) 4.0 atm
• b) 2.46 atm
• c) 4.92 atm
• d) 1.23 atm

Answer: 4.92 atm

Question:  A solution containing 8.6 g L^–1 of urea is isotonic with a 5% solution of unknown solute. The molar mass of the solute will be

• a) 348.9 g mol^–1
• b) 174.5 g mol^–1
• c) 87.3 g mol^–1
• d) 34.89 g mol^–1

Answer:  348.9 g mol^–1 

Question: Which of the following physical properties is used to determine, the molecular mass of a polymer solution?

• a) Relative lowering of vapour pressure
• b) Elevation in boiling point
• c) Depression in freezing point
• d) Osmotic pressure

Answer: Osmotic pressure

Question: In a 0.2 molar aqueous solution of a weak acid HX, the degree of ionization is 0.3. The freezing point of the solution will be nearest to

• a) 0.48°C
• b) –0.48°C
• c) –0.36°C 
• d) –0.26°C

Answer: –0.48°C

Question:  The boiling point of water at 735 torr is 99.07°C. The mass of NaCl added in 100 g water to make its boiling point 100°C is (k_b= 0.51 K kg mol^–1)

• a) 10.68 g
• b) 5.34 g
• c) 2.67 g
• d) 26.7 g

Answer: 5.34 g

Question: If van't Hoff factor, i = 1, then

• a) It is dissociation
• b) It is association
• c) Both (1) & (2)
• d) Neither dissociation nor association

Answer: Neither dissociation nor association

Question: Which of the following equimolar solution have highest vapour pressure?

• a) Glucose
• b) NaCl
• c) K₂SO₄
• d) K₄Fe(CN)₆

Answer: Glucose

Question:  If α is the degree of dissociation of Na₂SO₄ . The van’t Hoff factor used for the calculation of molecular mass is

• a) 1 + 2α
• b) 1 – 2α
• c) 1 + α 
• d) 1 – α

Answer: 1 + 2α

Question:  The relationship between the values of osmotic pressure of 0.1M solutions of KNO₃(P₁) and CH₃COOH(P₂) is

• a) P₁> P₂
• b) P₂> P₁
• c) P₁= P₂
• d) 

  

Answer:  P₁> P₂

Question:  The relationship between osmotic pressure (P) at 273 K when 10 g glucose (P₁₎, 10 g urea (P₂) and 10 g sucrose (P₃) are dissolved in 250 ml of water is

• a) P₁> P₂> P₃ 
• b) P₂> P₁> P₃
• c) P₂> P₃> P₁ 
• d) P₃> P₂> P₁

Answer:  P₂> P₁> P₃

Question:  What is the molality of C₂H₅OH in water solution which will freeze at –10^oC? [Mol. wt. of C₂H₅OH = 46, K_f for water = 1.86]

• a) 6.315 m
• b) 63.15 m
• c) 3.540 m
• d) 5.3 m

Answer: 5.3 m

Question: Which of the following pairs of solutions can we expect to be isotonic at the same temperature?

• a) 0.1 M NaCl and 0.1 M Na₂SO₄ 
• b) 0.1 M urea and 0.1 M NaCl
• c) 0.1 M urea and 0.2 M MgCl₂  
• d) 0.1 M Ca(NO₃)₂and 0.1 M Na₂SO₄

Answer:  0.1 M Ca(NO₃)₂and 0.1 M Na₂SO₄

Question: Which of the following aqueous solution has maximum freezing point?

• a) 0.01 M NaCl
• b) 0.005 M C₂H₅OH 
• c) 0.005 M MgI₂
• d) 0.01 M MgSO₄

Answer:  0.005 M C₂H₅OH 

Question:  0.1 M aqueous solution of K₄[Fe(CN)₆] will have the same freezing point as 0.1 M aqueous solution of

• a) Fe(SO₄)₃
• b) Al₂(SO₄)₃ 
• c) AlCl₃
• d) K₃PO₄

Answer: Al₂(SO₄)₃ 

Question: Assuming salts to be 90% dissociated, which of the following will have highest osmotic pressure?

• a) Decimolar Al₂(SO₄)₃ 
• b) Decimolar BaCl₂
• c) Decimolar Na₂SO₄
• d) A solution obtained by mixing equal volumes of (2) & (3) and filtering

Answer:  Decimolar Al₂(SO₄)₃ 

Question:  When CuSO₄ is added to a solution of ammonia

• a) Freezing point is lowered
• b) Freezing point is raised
• c) Boiling point is raised
• d) Both (1) & (3)

Answer: Freezing point is raised

Question:  An aqueous solution freezes at –0.36°C. K_f and K_b for water are 1.8 and 0.52 respectively then value of boiling point of solution at 1 atm pressure is

• a) 101.04°C
• b) 100.104°C 
• c) 0.104°C 
• d) 100°C

Answer: 100.104°C 

Question:  The osmotic pressure of decimolar solution of urea at 27°C is

• a) 2.49 bar
• b) 5.0 bar
• c) 3.4 bar
• d) 1.25 bar

Answer: 2.49 bar

Question: When a saturated solution of KCl is heated it becomes

• a) Unsaturated
• b) Supersaturated
• c) Remains saturated
• d) Attains equilibrium

Answer: Unsaturated

Question:  Arrange the following aqueous solutions in the order of their increasing boiling points

(i) 10^–4 M NaCl    (ii) 10^–3 M Urea    (iii) 10^–3 M MgCl₂    (iv) 10^–3 M NaCl

• a) (i) < (ii) < (iv) < (iii)
• b) (ii) < (i) = (iii) < (iv)
• c) (i) < (ii) < (iii) < (iv)
• d) (iv) < (iii) < (i) = (ii)

Answer: (i) < (ii) < (iv) < (iii)

Question: Molal elevation constant of a liquid is

• a) The elevation in b.p. which would be produced by dissolving one g of solute in 100 g of solvent
• b) The elevation in b.p. which would be produced by dissolving 1g. solute in 100 g of solvent
• c) Elevation in b.p. which would be produced by dissolving 1 gm of solute in 1000 g of solvent
• d) Elevation in b.p which would be produced by dissolving 1 mole of solute is 1000 g of solvent

Answer: Elevation in b.p which would be produced by dissolving 1 mole of solute is 1000 g of solvent

Question: 100 ml of 1 M NaOH is mixed with 50 ml of 1 N KOH solution. Normality of mixture is

• a) 1 N
• b) 0.5 N
• c) 0.25 N
• d) 2 N

Answer: 1 N

Question:  Two solutions marked as A and B are separated through semipermeable membrane as below. The phenomenon undergoing

• a) Na⁺ moves from solution A to solution B
• b) Both Na⁺ and Cl^– moves from solution (A) to solution (B)
• c) Both Na⁺ and Cl^– moves from solution (B) to (A)
• d) Solvent molecules moves from solution (A) to (B)

Answer: Solvent molecules moves from solution (A) to (B)

Question: Mass of NaCl required to prepare 0.01 m aqueous solution in 1 kg water is

• a) 0.01 g
• b) 0.585 g
• c) 58.8 g
• d) 5.88 g

Answer: 0.585 g

Question:  Correct observation

• a) Vapour pressure of solution I is lowest
• b) Relative lowering of vapour pressure is maximum in III
• c) Freezing point is maximum for III
• d) Boiling point is minimum for II

Answer: Relative lowering of vapour pressure is maximum in III

Question: An aqueous solution of sugar is taken in a beaker. At freezing point of solution

• a) Crystals of sugar separated
• b) Crystals of glucose and fructose are separated
• c) Crystals of ice separated
• d) Mixture of ice and some sugar crystals separated

Answer: Crystals of ice separated

Question: 15 g urea and 20 g NaOH dissolved in water. Total mass of solution is 250 g. Mole fraction of NaOH in the mixture

• a) 0.036
• b) 0.62
• c) 0.5
• d) 0.4

Answer: 0.036

Question:  Which of the following concentration terms is temperature independent?

I. Molarity      II. Molality     III. Normality      IV. Mole fraction

• a) I & II
• b) I & III
• c) II only
• d) II & IV

Answer: II & IV

Question:  A mixture of two liquids A and B having boiling point of A is 70°C, and boiling point of B is 100°C, distills at 101.2°C as single liquid, hence this mixture is

• a) Ideal solution
• b) Non ideal solution showing +ve deviation
• c) Non ideal solution showing –ve deviation
• d) Immiscible solution

Answer: Non ideal solution showing –ve deviation

Question:  Vapour phase diagram for a solution is given below if dotted line represents deviation

Correct observation for this solution

• a) ΔH_mix :+ve
• b) ΔS_mix :+ve
• c) ΔV_mix :+ve 
• d) All of these

Answer: All of these

Question:  The phenomenon taking place

• a) Exo-osmosis
• b) Endo-osmosis
• c) Reverse-osmosis
• d) All of these

Answer: Endo-osmosis

Question: 1 molar aqueous solution is _____ concentrated than 1 m aqueous solution

• a) More
• b) Less
• c) Equally
• d) Very less

Answer: More