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17., , 18., , 19., , 20., , 22., , The vapour pressure lowering caused by the addition of 100 g of, sucrose(molecular mass = 342) to 1000 g of water if the vapour, , pressure of pure water at 25° C is 23.8 mm Hg, , [RPET 1999}, {a) 1.25 mm Hg (b) 0.125 mm Hg, (ce) LI5 mm Hg (d) 00.12 mm Hg, Which of the following is incorrect [) & K 2005], , (a) Relative lowering of vapour pressure is independent, vapour pressure is a colligative property, (b) The is a colligati, {c) Vapour pressure of a solution is lower than the vapour, pressure of the solvent, (d) The relative lowering of vapour pressure is directly, propertional to the original pressure, , Among the following substances the lowest vapour pressure is, exerted by, , {a) Water (b) Mercury, {c) Kerosene (d) Rectified spirit, According to Raoult's law the relative lowering of vapour pressure of, a solution of volatile substance is equal to, [CBSE PMT 1995; BHU 2001), {a) Mole fraction of the solvent, (b) Mole fraction of the solute, {c) Weight percentage of a solute, (d) Weight percentage of a solvent, When a substance is dissolved in a solvent, the vapour pressure of, the solvent is decreased. This results in, [MP PMT 1983; NCERT 1981], {a) An increase in the boiling point of the solution, (b) A decrease in the boiling point of solvent, {c) The solution having a higher freezing point than the solvent, ({d) The solution having a lower osmotic pressure than the solvent, The vapour pressure of a liquid depends on, (a) Temperature but not on volume, (b) Volume but not on temperature, (c) Temperature and volume, (d) Neither on temperature nor on volume, Which one of the statements given below concerning properties of, solutions, describes a colligative effect —_ [ATIMS 2003], (a) Boiling point of pure water decreases by the addition of ethanol, (b) Vapour pressure of pure water decreases by the addition of, nitric acid, ({c) Vapour pressure of pure benzene decreases by the addition of, naphthalene, (d) Boiling point of pure benzene increases by the addition, of toluene, The atmospheric pressure is sum of the, [Kerala CET (Med.) 2002), (a) Pressure of the biomolecules, (b) Vapour pressure of atmospheric constituents, {c) Vapour pressure of chemicals and vapour pressure of volatiles, {d) Pressure created on to atmospheric molecules, , ta, , ma, , ts

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23:08 id @ ¥ - Ba, , , , (1.84 MB) 02-Solution-(Ques.)-Final-E. pdf ': Paelsa, , , , WO) tae a) \, 7. The vapour pressure lowering caused by the addition of 0 g of 28. ”, sucrose(molecular mass - 342) to 1000 ¢ of water if the vapour, , pressure of pure water at 25°C is 238 mm Hg, , 7, , [RPET 1999], (a) 1.25 mm Mg {b) 0125 nam Mg, (ce) M5 ean Hg {d) 0012 nm He, 18 Which of the following is incorrect () & K 2005), (a) Relative lowering of vapour pressure is independent, (b) The vapour pressure is a colligative property, (ce) Vapour pressure of a solution is lower than the vapour, pressure of the solvent, (d) The relative lowermg of vapour pressure is directly, propertional to the original pressure, Ls Among the following substances the lowest vapour pressure is, exerted by, (2) Water {b) Mercury, (c) Kerosene (d) Rectified spina, 20. — According to Raault's law the relative lowering of vapour pressure of, @ solution of volatile substance is equal to, [CBSE PAIT 1995; BHL 2001], , 8, , es4uenenanan, , Mole fraction of the solvent, Mole fraction of the solute @), (c) Weight percentage of a solute a, (d) Weight percentage of o solvent ', 2. When a substance is dissolved in a solvent, the vapour pressure of, the solvent is decreased, This results in, , , , , , [MP PMT 1983; NCERT 1984], (o) An increase in the boiling point of the solution, , , , (Lb) A decrease i the boiling point of sulvent, , (c) The solution having a higher freezing point than the solvent (, , (d) The solution having a lower osmotic pressure than the solvent {, 22, The vapour prenuwe af a liquid depends on 32 «4, , (a) Temperature but not on volume, , (Lb) Volume but not on temperature {, , (fc) Temperature and volume, , , , (d) Neither on temperature nor on volume, 23. Which one of the statements given below concerning properties of, solutions, describes a colligative effect [AIMS 2003], (a) Boiling point of pure water decreases by the addition of ethanol, (b) Vapour pressure cf pore water decreases by the addition of, nitric acid, (©) Vapour pressure of pure benzene decreases by the addition of, naphthalene, {d) Boiling point of pure benzene increases by the addition, of toluene, 24. The atmospheric pressure is sum of the, [Kerala CET (Med) 2002] 34., , wre anne, , Pressure of the bsornolecules, Vapour pressure of atrnospheric constituents, Vapour pressure of chemicals and vapour pressure of volatiles (, , , , Pressure created on te etmospheric molecules (, 25. The vapour pressure of pure liquid A is 0.80 atm On mixing a non {, volatile B to A, its vapour pressure becomes 0.6 atm, The mole, , fraction of B in the solution is IMP PET 2003) (, _, = f-»e 8 & &, PDF Toolkit Share Save Open with Print, , NH O <

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—, When a substance is dissolved in a solvent the vapour pressure of, the solvent is decreased. This results in, , [NCERT 1981], (a) An increase in the b.p. of the solution, , (b) A decrease in the b.p. of the solvent, , (c) The solution having a higher freezing point than the solvent, , (d) The solution having a lower osmotic pressure than the solvent, , if P° and P are the vapour pressure of a solvent and its solution, respectively and N, and N, are the mole fractions of the solvent, and solute respectively, then correct relation is, , (a) P=P°N, (b) P=P°N,, , (c) P° =PN, (d) P=P*(N,/N>), , An aqueous solution of methanol in water has vapour pressure, , (a) Equal to that of water, , (b) Equal to that of methanol, , (c) More than that of water, , (d) Less than that of water, , The pressure under which liquid and vapour can coexist at, equilibrium is called the, , (a) Limiting vapour pressure, , (b) Real vapour pressure, , (c) Normal vapour pressure, , (d) Saturated vapour pressure, , Which solution will show the maximum vapour pressure at 300 K, , @) 1MCyHyO, (b) 1. CH,COOH, (c) 1M NaCl, (d) 1M NaCl, , The relative lowering of the vapour pressure is equal to the ratio, between the number of, , [EAMCET 1991; CBSE PMT 1991], (a} Solute moleules and solvent molecules, (b) Solute molecules and the total molecules in the solution, (c) Solvent molecules and the total molecules in the solution, (d) Solvent molecules and the total number of ions of the solute, , Sem® of acetone is added to 100cm* of water, the vapour, pressure of water over the solution, , (a) It will be equal to the vapour pressure of pure water, , (b) It will be less than the vapour pressure of pure water, , (c) It will be greater than the vapour pressure of pure water, , (d) It will be very large, , At 300 K, when a solute is added to a solvent its vapour pressure, , over the mercury reduces from 50 mm to 45 mm The value of, mole fraction of solute will be, , (a) 0.005 (b) 0.010, (c) 0.100 (d) 0.900, A solution has a | : 4 mole ratio of pentane to hexane. The vapour, , pressure of the pure hydrocarbons at 20°C are 440 minHg for, pentane and 120 mmibg for hexane. The mole fraction of pentane in, the vapour phase would be, , [CBSE PMT 2005], (a) 0.549 (b) 0.200, (c) 0.786 (d) 0478

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8., , Which is not a colligative property, [CPMT 1984; BHU 1982; Manipal MEE 1995], (a) Refractive index, (b) Lowering of vapour pressure, (c) Depression of freezing point, (d) Elevation of boiling point, Which of the following is a colligative property, [BHU 1990; NCERT 1983; MP PMT 1983; DPMT 1981, 83;, MP PET/PMT 1998; AIMS 1999; Pb. CET 2000], , (a) Surface tension (b) Viscosity, (c) Osmotic pressure (d) Optical rotation, Colligative properties are used for the determination of, [Kerala CET (Engg) 2002], (a) Molar Mass, , (b) Equivalent weight, (c) Arrangement of molecules, (d) Melting point and boiling point, (d) Both (a) and (b), What does not change on changing temperature, [DCE 2001], (a) Mole fraction (b) Normality, {c) Molality (d) None of these, , Lowering of vapour pressure, , Vapour pressure of CCI, at 25°C is 143mm of Hg0.5 gm, of a non-volatile solute (mol wt. = 65) is dissolved in, 100m/ CCL, . Find the vapour pressure of the solution (Density of, , CCl, =1.58 g/cm?) [CBSE PMT 1998], (a) 141.43mm (b) 94.39 7m, (c) 199.34mm (d) 143.99mm, , For a solution of volatile liquids the partial vapour pressure of each, component in solution is directly proportional to, (a) Molarity (b) Mole fraction, (c) Molatity {d) Normality, “The relative lowering of the vapour pressure is equal to the mole, fraction of the solute.” This law is called, , [MP PET 1997, 2001], (a) Henry's law (b) Raoult's law, (c) Ostwald's law (d) Arrhenius's law, The relative lowering of vapour pressure produced by dissolving 71.5, g of a substance in 1000 g of water is 0.00713, The molecular weight, of the substance will be, , [DPMT 2001}, (a) 18.0 (b) 342, (c) 60 (d) 180, When mercuric iodide is added to the aqueous solution of potassium, iodide, the [WT 1987}, , (a) Freezing point is raised, , (b) Freezing point is lowered, , (c) Freezing point does not change, (d) Boiling point does not change

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The magnitude of colligative properties in all colloidal dispersions is, , ..than solution [AMU 1999], (a) Lower (b) Higher, , (c) Both (d) None, , Equimolar solutions in the same solvent have [AIEEE 2005], , (a) Same boiling point but different freezing point, (b) Same freezing point but different boiling point, (c) Same boiling and same freezing points, (d) Different boiling and different freezing points, Which of the following is a colligative property, [AFMC 1992; CBSE PMT 1992; MP PMT 1996, 2003], (a) Osmotic pressure (b) Boiling point, (c) Vapour pressure (d) Freezing point, The colligative properties of a solution depend on, [CPMT 1984; MP PMT 1993; UPSEAT 2001; Kerala PMT 2002], (a) Nature of solute particles present in it, (b) Nature of solvent used, (c) Number of solute particles present in it, (d) Number of moles of solvent only, Which of the following is not a colligative property, [BHU 1982; CPMT 1988; DPMT 1985; MP PET 1999], (a) Osmotic pressure, (b) Elevation in B.P., (c) Vapour pressure, (d) Depression in freezing point, Which of the following is not a colligative property, [MP PET 2001; CPMT 2001; Pb. CET 2001], (a) Optical activity, (b) Elevation in boiling point, (c) Osmotic pressure, , (d) Lowering of vapour pressure