Solutions PYQs Set 4 (PDF)

Set 4 of 12 · Questions 91-120 of 332

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Mere Teacher · Previous Year Questions NEET Chemistry · Solutions · Set 4 (Q91-120)
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91. $If 500 mL of CaCl_{2} solution contains 3.01 \times 10^{22} chloride ions, molarity of the solution will be$ (1) $0.05 M$ (2) $0.01 M$ (3) $0.1 M$ (4) $0.02 M$ 92. $20 mL of 0.1 MHCl is added to the 30 mL of 0.1 M NaOH . To this solution extra 50 mL of water was added. What is the molarity of the final solution formed?$ (1) $0.1 M$ (2) $0.01 M$ (3) $0.5 M$ (4) $0.05 M$ 93. $Given below are two statements: Statement I: The Henry's law constant K_{H} is constant with respect to variations in solution's concentration over the range for which the solution is ideally dilute. Statement II: K_{H} does not differ for the same solute in different solvents. In the light of the above statements, choose the correct answer from the options given below$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are false$ (3) $Statement I is true but Statement II is false$ (4) $Both Statement I and Statement II are true$ 94. $At T (K), 2 moles of liquid A and 3 moles of liquid B are mixed. The vapour pressure of ideal solution formed is 320 mm Hg. At this stage, one mole of A and one mole of B are added to the solution. The vapour pressure is now measured as 328.6 mm Hg. The vapour pressure (in mm Hg) of A and B are respectively:$ (1) $400,300$ (2) $600,400$ (3) $300,200$ (4) $500, 200$ 95. $After adding non-volatile solute freezing point of water decreases to - 0.186^{\circ} C . Calculate Δ T_{b} if K_{f} = 1.86 K kg mol^{- 1} and K_{b} = 0.521 K kg mol^{- 1}$ (1) $0.0521 K$ (2) $0.0186 K$ (3) $0.521 K$ (4) $1.86 K$ 96. $Which of the following conditions are correct for real solutions showing negative deviation from Raoult's law?$ (1) $Δ H_{Mix} < 0; Δ V_{Mix} > 0$ (2) $Δ H_{Mix} > 0; Δ V_{Mix} > 0$ (3) $Δ H_{Mix} > 0; Δ V_{Mix} < 0$ (4) $Δ H_{Mix} < 0; Δ V_{Mix} < 0$ 97. $The Van’t Hoff factor i for acompound which undergoes dissociation in one solvent and association in other solvent is respectively$ (1) $less than one and greater than one$ (2) $less than one and less than one$ (3) $greater than one and less than one$ (4) $greater than one and greater than one.$ 98. $In countries nearer to polar region, the roads are sprinkled with CaCl_{2} . This is$ (1) $to minimise the snow fall$ (2) $to minimise pollution$ (3) $to minimise the accumulation of dust on the road$ (4) $to minimise the wear and tear of the roads.$ 99. $A solution of two miscible liquids showing negative deviation from Raoult's law will have :$ (1) $increased vapour pressure, increased boiling point$ (2) $increased vapour pressure, decreased boiling point$ (3) $decreased vapour pressure, decreased boiling point$ (4) $decreased vapour pressure, increased boiling point$ 100. $if O .l M solution ofglucose and 0.1 M solution of urea are placed on two sides of the semipermeable membrane to equal heights, then it will be correct to say that$ (1) $there will be no net movement across the membrane$ (2) $glucose will flow towards glucose solution$ (3) $urea will flow towards glucose solution$ (4) $water will flow from urea solution to glucose.$ 101. $For which among the following equimolar aqueous solutions, van't Hoff factor has the lowest value?$ (1) $Aluminium chloride$ (2) $Potassium sulphate$ (3) $Ammonium chloride$ (4) $Urea$ 102. $The molarity of one molal glucose solution having density of 1.2 g / mL is$ (1) $0.101 M$ (2) $1.01 M$ (3) $2.01 M$ (4) $0.001 M$ 103. $The mass of a non-volatile solute of molar mass 40 g mol^{- 1} that should be dissolved in 114 g of octane to lower its vapour pressure by 20 % is$ (1) $10 g$ (2) $11.4 g$ (3) $9.8 g$ (4) $12.8 g$ 104. $If 2 g of NaOH is dissolved to make 200 mL solution at 25^{\circ} C, the molarity (M) at 90^{\circ} C is$ (1) $M < 0.25$ (2) $0.5 > M > 0.25$ (3) $M = 0.25$ (4) $0.5 < M < 1.0$ 105. $Which of the following can be measured by the Ostwald-Walker dynamic method?$ (1) $Vapour pressure of the solvent$ (2) $Relative lowering of vapour pressure$ (3) $Lowering of vapour pressure$ (4) $All of these$ 106. $Two liquids A and B form an ideal solution at temperature T K. At T K, the vapour pressures of pure A and B are 55 and respectively. What is the mole fraction of in solution of and in equilibrium with a vapour in which the mole fraction of A is 0.8?$ (1) $0.340$ (2) $0.663$ (3) $0.5217$ (4) $0.480$ 107. $Consider separate solution of 0.500 M C_{2} H_{5} OH(aq), 0.100 M M g_{3} (P O_{4})_{2} (aq), 0.250 M KBr(aq) and 0.125 M N a_{3} P O_{4} (aq) at 25°C. Which statement is true about these solution, assuming all salts to be strong electrolytes ?$ (1) $They all have the same osmotic pressure.$ (2) $0.100 M M g_{3} (P O_{4})_{2} (aq) has the highest osmotic pressure.$ (3) $0.125 M N a_{3} P O_{4} (aq) has the highest osmotic pressure.$ (4) $0.500 M C_{2} H_{5} OH(aq) has the highest osmotic pressure$ 108. $Which of the following solution has the highest freezing point?$ (1) $0.1 molKCl in 1 kg water$ (2) $0.1 mol K_{2} SO_{4} in 1 kg water$ (3) $0.1 mol Urea in 1 kg water$ (4) $30 g of glucose in 1 kg water$ 109. $The molarity of urea (molar mass = 60 g mol^{- 1}) solution by dissolving 15 g of urea in 500 cm^{3} of water is$ (1) $2 mol dm^{- 3}$ (2) $0.5 mol dm^{- 3}$ (3) $0.125 mol dm^{- 3}$ (4) $0.0005 mol dm^{- 3}$ 110. $How many g of dibasic acid (mol. weight 200) should be present in 100 m L of the aqueous solution to give strength of 0.1 N ?$ (1) $10 g$ (2) $2 g$ (3) $1 g$ (4) $20 g$ 111. $If molality of the dilute solution is doubled, the value of molal depression constant (K) will be$ (1) $halved$ (2) $tripled$ (3) $unchanged$ (4) $doubled.$ 112. $A flask contains a mixture of isohexane and 3 -methylpentane. One of the liquids boils at 63^{\circ} C whilethe other boils at 60^{\circ} C . What is the best way to seperate the two liquids and which one will be distilledout first?$ (1) $Simple distillation and isohexane.$ (2) $Fractional distillation and isohexane.$ (3) $Simple distillation and 3 -Methylpantane.$ (4) $Fractional distillation and 3 -Methylpantane.$ 113. $if O .15 g ofa solute, dissolved in 15 g ofsolvent, is boiled at a temperature higher by 0.21 6^{o} C, than that ofthe pure solvent. The molecular weight of the substance (Molal elevation constant for the solvent is 2. 16 C) is$ (1) $10.1$ (2) $100$ (3) $1.01$ (4) $1000$ 114. $18 g of glucose is dissolved in 90 g of water. The relative lowering of vapour pressure of the solution is equal to$ (1) $6$ (2) $0.2$ (3) $5.1$ (4) $0.02$ 115. $We have three aqueous solutions of NaCl labelled as ' A^{’},,^{’} B^{’} and ' C^{’} with concentration 0.1 M, 0.01 M & 0.001 M, respectively. The value of van t^{’} Haft factor (i) for these solutions will be in the order.$ (1) $i_{A} < i_{B} < i_{C}$ (2) $i_{A} < i_{C} < i_{B}$ (3) $i_{A} = i_{B} = i_{C}$ (4) $i_{A} > i_{B} > i_{C}$ 116. $In one molal solution that contains 0.5 mole of a solute, there is$ (1) $1000 g of solvent$ (2) $500 mL of solvent$ (3) $500 g of solvent$ (4) $100 mL of solvent$ 117. $Solution ' A' contains acetone dissolved in chloroform and solution ' B' contains acetone dissolved in carbon disulphide. The type of deviations from Raoult's law shown by solutions A and B, respectively are$ (1) $positive and positive$ (2) $positive and negative$ (3) $negative and negative$ (4) $negative and positive.$ 118. $A set of solutions is prepared using 180 g of water as a solvent and 10 g of different nonvolatile solutes A, B and C . The relative lowering of vapour pressure in the presence of these solutes are in the order [Given, molar mass of A = 100 gmol^{- 1}; B = 200 gmol^{- 1} C = 10, 000 gmol^{- 1}]$ (1) $A > C > B$ (2) $C > B > A$ (3) $A > B > C$ (4) $B > C > A$ 119. $The molality (in mol kg^{- 1}) of 1 mole of solute in 50 g of solvent is$ (1) $10$ (2) $20$ (3) $30$ (4) $40$ 120. $A non-volatile solute ' A' tetramerises in water to the extent of 80 %, 2.5 g of ' A' in 100 g of water, lowers the freezing point by 0.3^{\circ} C . The molar mass of A in mol L^{- 1} is (K_{f} for water = 1.86 K kg mol^{- 1})$ (1) $62$ (2) $221$ (3) $155$ (4) $354$