Solutions PYQs Set 11 (PDF)

Set 11 of 12 · Questions 301-330 of 332

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Mere Teacher · Previous Year Questions NEET Chemistry · Solutions · Set 11 (Q301-330)
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301. $Which one is a colligative property?$ (1) $Boiling point$ (2) $Vapour pressure$ (3) $Osmotic pressure$ (4) $Freezing point$ 302. $Vapour pressure of chloroform (C H C l_{3}) and dichloromethane (C H_{2} C l_{2}) at 2 5^{\circ} C are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of C H C l_{3} and 40 g of C H_{2} C l_{2} at the same temperature will be (Molecular mass of C H C l_{3} = 119.5 u and molecular mass of C H_{2} C l_{2} = 85 u)$ (1) $173.9 mm Hg$ (2) $615.0 mm Hg$ (3) $347.9 mm Hg$ (4) $None$ 303. $What is the effect of external pressure on the osmotic pressure (OP) of a solution?$ (1) $OP decreases with increase of pressure$ (2) $OP decreases initially, then increases$ (3) $OP remained nearly same with increase/decrease of external pressure$ (4) $OP increases with increase of pressure$ 304. $An aqueous solution of a salt M X_{2} at certain temperature has a van’t Hoff factor of 2. The degree of dissociation for this solution of the salt is :$ (1) $0.67$ (2) $0.33$ (3) $0.80$ (4) $0.50$ 305. $An open beaker of water in equilibrium with water vapour is in a sealed container. When a few grams ofglucose are added to the beaker of water, the rate at which water molecules$ (1) $leaves the solution increases$ (2) $leaves the vapour increases$ (3) $leaves the vapour decreases$ (4) $leaves the solution decreases$ 306. $At 35^{\circ} C the vapour pressure of C S_{2} is 512 mmHg and that of acetone is 344 mmHg . A solution of Hg in acetone has a total vapour pressure of 600 mmHg . The false statement amongst the following is:$ (1) $heat must be absorbed in order to produce the solution at 35^{\circ} C$ (2) $Does not obey Raoult’s law$ (3) $a mixture of 100 mLC S^{2} and 100 mL acetone has a volume < 200 mL$ (4) $C S^{2} and acetone are less attracted to each other than to themselves$ 307. $If M, W and V represent molar mass of solute, mass of solute and volume of solution in litres respectively, which among the following equations is true?$ (1) $π = \frac{MWR}{TV}$ (2) $π = \frac{TMR}{WV}$ (3) $π = \frac{TWR}{VM}$ (4) $π = \frac{TRV}{WM}$ 308. $The beans are cooked earlier in pressure cooker because$ (1) $boiling point increases with increasing pressure$ (2) $boiling point decreases with increasing pressure$ (3) $extra pressure of pressure cooker softens the beans$ (4) $internal energy is not lost while cooking in pressure cooker.$ 309. $A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statement is correct regarding the behaviour of the solution?$ (1) $The solution is non-ideal, showing +ve deviation from Raoult’s Law.$ (2) $The solution in non-ideal, showing -ve deviation from Raoult’s Law.$ (3) $n-heptane shows +ve deviation while ethanol shows -ve deviation from Raoult’s Law.$ (4) $The solution formed is an ideal solution.$ 310. $Which one of the following statements regarding Henry's law is not correct ?$ (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) $Higher the value of K_{H} at a given pressure, higher is the solubility of the gas in the liquids$ 311. $Osmotic pressure of the solution can be increased by$ (1) $increasing the temperature of the solution$ (2) $decreasing the temperature of the solution$ (3) $increasing the volume of the vessel$ (4) $diluting the solution.$ 312. $What type of following solutions is the gasoline?$ (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) $Gas as solute and liquid as solvent.$ 313. $There are two beakers (I) having pure volatile solvent and (II) having volatile solvent and non-volatilesolute. If both beakers are placed together in a closed container then:$ (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) $Volume of solvent beaker will increase and solution beaker will decrease$ 314. $XY is the membrane/partition between two chambers 1 and 2 containing sugar solutions of concentration c_{1} and c_{2} (c_{1} > c_{2}) molL^{- 1} . For the reverse osmosis to take place identify the correct condition. (Here p_{1} and p2 are pressures applied on chamber 1 and 2). (A) Membrane/Partition : Cellophane, p_{1} > π (B) Membrane/Partition : Porous, p2>π(C) Membrane/Partition : Parchment paper, p_{1.} > π (D) Membrane/Partition : Cellophane, p2>π Choose the correct answer from the option given below:$ (1) $A and C Only$ (2) $A and D Only$ (3) $B and D Only$ (4) $C Only$ 315. $The equation that represents van't Hoff general solution equation is$ (1) $π = \frac{n}{V} RT$ (2) $π = nRT$ (3) $π = \frac{V}{n} RT$ (4) $π = nVRT$ 316. $The vapour pressure of a non-ideal two component solution is given below Identify the correct T - X curve for the same mixture,$ (1) (2) (3) (4) 317. $Which of the following is not correct?$ (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) $C_{2} H_{5} OH + C H_{3} - CO - C H_{3} - Ideal solution$ 318. $Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y. respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1 : 4. The ratio of molar masses of X and Y is :$ (1) $1 : 4$ (2) $1 : 0.25$ (3) $1 : 0.20$ (4) $1 : 5$ 319. $Determination of the molar mass of acetic acid in benzene using freezing point depression is affected by :$ (1) $partial ionization$ (2) $dissociation$ (3) $complex formation$ (4) $association$ 320. $Which of the following sets of solutions of urea (mol . mass 60 g mol^{- 1}) and sucrose (mol. mass 342 g mol^{- 1}) is isotonic?$ (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) $3.0 g L^{- 1} urea and 17.1 g L^{- 1} sucrose$ 321. $Solubility of which among the following substances in water increases slightly with rise in temperature?$ (1) $Potassium bromide$ (2) $Potassium chloride$ (3) $Potassium nitrate$ (4) $Sodium nitrate$ 322. $Which of the following is dependent on temperature?$ (1) $Molarity$ (2) $Mole fraction$ (3) $Weight percentage$ (4) $Molality$ 323. $Which of the following colligative properties can provide molar mass of proteins, polymers and colloids with greater precision?$ (1) $Depression in freezing point$ (2) $Osmotic pressure$ (3) $Relative lowering of vapour pressure$ (4) $Elevation in boiling point$ 324. $When the pure solvent diffuses out of the solution through the semipermeable membrane then the process is called$ (1) $sorption$ (2) $dialysis$ (3) $osmosis$ (4) $reverse osmosis.$ 325. $The swelling in feet and ankles of an aged person due to sitting continuously for long hours during travel, is reduced by soaking the feet in warm salt water. This is because of$ (1) $reverse osmosis$ (2) $osmosis$ (3) $edema$ (4) $diffusion.$ 326. $Choose the correct statement with respect to the vapour pressure of a liquid among the following$ (1) $Increases linearly with increasing temperature$ (2) $Increase non-linearly with increasing temperature$ (3) $Decreases linearly with increasing$ (4) $Decreases non-linearly with increasing temperature$ 327. $Pure water can be obtained from sea water by$ (1) $centrifugation$ (2) $plasmolysis$ (3) $reverse osmosis$ (4) $sedimentation.$ 328. $An aqueous solution of alcohol contains of water and of ethyl alcohol. The mole fraction of water is$ (1) $0.7$ (2) $0.9$ (3) $0.1$ (4) $0.4$ 329. $A^{2 +}, B^{2 +} and C^{-} form an ionic complex like A_{x - 2} (B (C)_{x})_{2} . If the complex is 75 % dissociated in a solvent with i = 4, the coordination number of B is$ (1) $3$ (2) $4$ (3) $5$ (4) $6$ 330. $For an ideal solution of two components A and B, which of the following is true?$ (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) $A-A, B-B and A-B interactions are identical$