Solutions PYQs Set 14 (PDF)

Set 14 of 14 · Questions 391-419 of 419

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Solutions · Set 14 (Q391-419)
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391. $Which one of the following statements regarding Henry's law is not correct ?$ (1) $Different gases have different K_{H} (Henry' law constant) values at the same temperature.$ (2) $The value of K_{H} increases with increase of temperature and K_{H} is function of the nature of the gas$ (3) $The partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in the solution.$ (4) $Higher the value of K_{H} at a given pressure, higher is the solubility of the gas in the liquids$ 392. $Osmotic pressure of the solution can be increased by$ (1) $increasing the temperature of the solution$ (2) $decreasing the temperature of the solution$ (3) $increasing the volume of the vessel$ (4) $diluting the solution.$ 393. $What type of following solutions is the gasoline?$ (1) $Liquid as solute and liquid as solvent.$ (2) $Liquid as solute and solid as solvent.$ (3) $Solid as solute and liquid as solvent.$ (4) $Gas as solute and liquid as solvent.$ 394. $There are two beakers (I) having pure volatile solvent and (II) having volatile solvent and non-volatilesolute. If both beakers are placed together in a closed container then:$ (1) $Volume of solvent beaker will decrease and solution beaker will increase$ (2) $Volume of solvent beaker will increase and solution beaker will also increase$ (3) $Volume of solvent beaker will decrease and solution beaker will also decrease$ (4) $Volume of solvent beaker will increase and solution beaker will decrease$ 395. $XY is the membrane/partition between two chambers 1 and 2 containing sugar solutions of concentration c_{1} and c_{2} (c_{1} > c_{2}) molL^{- 1} . For the reverse osmosis to take place identify the correct condition. (Here p_{1} and p2 are pressures applied on chamber 1 and 2). (A) Membrane/Partition : Cellophane, p_{1} > π (B) Membrane/Partition : Porous, p2>π(C) Membrane/Partition : Parchment paper, p_{1.} > π (D) Membrane/Partition : Cellophane, p2>π Choose the correct answer from the option given below:$ (1) $A and C Only$ (2) $A and D Only$ (3) $B and D Only$ (4) $C Only$ 396. $The equation that represents van't Hoff general solution equation is$ (1) $π = \frac{n}{V} RT$ (2) $π = nRT$ (3) $π = \frac{V}{n} RT$ (4) $π = nVRT$ 397. $The vapour pressure of a non-ideal two component solution is given below Identify the correct T - X curve for the same mixture,$ (1) (2) (3) (4) 398. $Which of the following is not correct?$ (1) $n-hexane + n-heptane - Ideal solution$ (2) $C_{2} H_{5} OH + H_{2} O - Positive deviation from Raoult's Law$ (3) $CHC l_{3} + C H_{3} - CO - C H_{3} - Negative deviation from Raoult's Law$ (4) $C_{2} H_{5} OH + C H_{3} - CO - C H_{3} - Ideal solution$ 399. $Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y. respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1 : 4. The ratio of molar masses of X and Y is :$ (1) $1 : 4$ (2) $1 : 0.25$ (3) $1 : 0.20$ (4) $1 : 5$ 400. $Determination of the molar mass of acetic acid in benzene using freezing point depression is affected by :$ (1) $partial ionization$ (2) $dissociation$ (3) $complex formation$ (4) $association$ 401. $Which of the following sets of solutions of urea (mol . mass 60 g mol^{- 1}) and sucrose (mol. mass 342 g mol^{- 1}) is isotonic?$ (1) $9.1 g L^{- 1} urea and 6.0 g L^{- 1} sucrose$ (2) $3.0 g L^{- 1} urea and 3.0 g L^{- 1} sucrose$ (3) $6.0 g L^{- 1} urea and 9.0 g L^{- 1} sucrose$ (4) $3.0 g L^{- 1} urea and 17.1 g L^{- 1} sucrose$ 402. $Solubility of which among the following substances in water increases slightly with rise in temperature?$ (1) $Potassium bromide$ (2) $Potassium chloride$ (3) $Potassium nitrate$ (4) $Sodium nitrate$ 403. $Which of the following is dependent on temperature?$ (1) $Molarity$ (2) $Mole fraction$ (3) $Weight percentage$ (4) $Molality$ 404. $Which of the following colligative properties can provide molar mass of proteins, polymers and colloids with greater precision?$ (1) $Depression in freezing point$ (2) $Osmotic pressure$ (3) $Relative lowering of vapour pressure$ (4) $Elevation in boiling point$ 405. $When the pure solvent diffuses out of the solution through the semipermeable membrane then the process is called$ (1) $sorption$ (2) $dialysis$ (3) $osmosis$ (4) $reverse osmosis.$ 406. $The swelling in feet and ankles of an aged person due to sitting continuously for long hours during travel, is reduced by soaking the feet in warm salt water. This is because of$ (1) $reverse osmosis$ (2) $osmosis$ (3) $edema$ (4) $diffusion.$ 407. $Choose the correct statement with respect to the vapour pressure of a liquid among the following$ (1) $Increases linearly with increasing temperature$ (2) $Increase non-linearly with increasing temperature$ (3) $Decreases linearly with increasing$ (4) $Decreases non-linearly with increasing temperature$ 408. $Pure water can be obtained from sea water by$ (1) $centrifugation$ (2) $plasmolysis$ (3) $reverse osmosis$ (4) $sedimentation.$ 409. $An aqueous solution of alcohol contains of water and of ethyl alcohol. The mole fraction of water is$ (1) $0.7$ (2) $0.9$ (3) $0.1$ (4) $0.4$ 410. $A^{2 +}, B^{2 +} and C^{-} form an ionic complex like A_{x - 2} (B (C)_{x})_{2} . If the complex is 75 % dissociated in a solvent with i = 4, the coordination number of B is$ (1) $3$ (2) $4$ (3) $5$ (4) $6$ 411. $For an ideal solution of two components A and B, which of the following is true?$ (1) $∆ H_{mi x in g} < 0 (zero)$ (2) $∆ H_{mi x in g} > 0 (zero)$ (3) $A-B interaction is stronger than A-A and B-B interactions$ (4) $A-A, B-B and A-B interactions are identical$ 412. $An ideal solution is formed when its components$ (1) $have no volume change on mixing$ (2) $have no enthalpy change on mixing$ (3) $have both the above characteristics$ (4) $have high solubility$ 413. $Molarity is defined as$ (1) $the number of moles of solute dissolved in one dm^{3} of the solution$ (2) $the number of moles of solute dissolved in 1 kg of solvent$ (3) $the number of moles of solute dissolved in 1 dm^{3} of the solvent$ (4) $the number of moles of solute dissolved in 100 mL of the solvent.$ 414. $If O_{2} gas is bubbled through water at 303 K, the number of millimoles of O_{2} gas that dissolve in 1 litre of water is_______. (Nearest Integer) (Given : Henry's Law constant for O_{2} at 303 K is 46.82 k bar and partial pressure of O_{2} = 0.920 bar)(Assume solubility of O_{2} in water is too small, nearly negligible)$ 415. $The total pressure of a mixture of non-reacting gases X (0.6 g) and Y (0.45 g) in a vessel is 740 mm of Hg, The partial pressure of the gas X is _________mm of Hg. (Nearest Integer) (Given : molar mass X = 20 and Y = 45 g m o l^{- 1})$ 416. $C O_{2} gas is bubbled through water during a soft drink manufacturing process at 298K. If C O_{2} exerts a partial pressure of 0.835 bar then xmmolof C O_{2} would dissolve in 0.9Lof water. The value of x is (Nearest integer) (Henry’s law constant for C O_{2} at 298K is 1.67 \times 1 0^{3} ba r)$ 417. $If the concentration of glucose (C_{6} H_{12} O_{6}) in blood is 0.72 g L^{- 1}, the molarity of glucose in blood is _____\times 1 0^{- 3} M (Nearest integer) [Given: Atomic mass of C=12, H=1, O=16 u]$ 418. $The vapour pressures of two volatile liquids A and B at 25°C are 50 Torr and 100 Torr, respectively. If the liquid mixture contains 0.3 mole fraction of A, then the mole fraction of liquid B in the vapour phase is . The value of x is________.$ 419. $Based on the given figure, the number of correct statement/s is/are_______A. Surface tension is the outcome of equal attractive and repulsion forces acting on the liquid molecule in bulk. B. Surface tension is due to uneven forces acting on the molecules present on the surface. C. The molecule in the bulk can never come to the liquid surface. D. The molecules on the surface are responsible for vapour pressure if the system is a closed system.$