20° C is 185 torr. When 1.2 g of a non volatile substance was dissolved in 100 g of acetone at 20° C its vapour pressure was 183 torr. The molar mass of the substance is a. 32 b. 64 …
mol-1 that should be dissolved in 114 g of octane to lower its vapour pressure by 20 % is a. 10g b. 11. 4 g c. 9.8 g d. 12. 8 g Ans. a (9)
(a) Because of viscosity (b) Because of inertia (c) Because of friction (d) Because of capillarity Ans. d (43)
(a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion …
a. Mole fraction of the solvent b. Mole fraction of the solute c. Weight percentage of a solute d Weight percentage of a solvent Ans. b (11)
25° C. It forms an ideal solution with ‘B’ in which mole fraction of A is 0.8. if the vapour pressure of the solution is 84 mm of Hg at 25° C , the vapour pressure of pure ‘B’ at …
(a) Attracted when x lies between A and B and are repelled when X lies between B and C (b) Attracted when x lies between B and C and are repelled when X lies between A and B (c) Attracted …
(a) P = applied force, Q = extension (b) P = extension, Q = applied force (c) P = extension, Q = stored elastic energy (d) P = stored elastic energy, Q = extension Answer-c (7)
a. 140 torr b. 20 torr c. 68 torr d. 72 torr Ans. d (56)
20° C is 17.5 mmHg. if 18 g of glucose is added to 178.2 g of water at 20° C the vapour pressure of the resulting solution will be a. 15.750 mm Hg b. 16.500 mm Hg c. 17.325 …
a. Lowering of vapour pressure b.Elevation in boiling point c. Depression of freezing point d. Osmotic pressure Ans. d (3)
a. 1 m K [ Fe (CN)6 ] solution b. 1 m C6 H12 O6 solution c. 1 m KCl solution d. 1 m rock salt solution Ans. b (23)
(a) 2T/rJ (b) 3T/RJ (c) 3T/J[(1/R )-(1/R)] (d) 2T/J[(1/r)-(1/R)] Ans. c (30)
(a) III only (b) II and III (c) I and III (d) I only Explanation-a (9)
a. Lower b. Higher c. Both d.None Ans. a (4)
(a) Elasticity of wire P is maximum (b) Elasticity of wire Q is maximum (c) Tensile strength of R is maximum (d) None of the above is true Answer-d (4)
(a) πR2/T (b) πR2T (c) 2πRT (d) 2RT Ans. d (21)
(a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion …
20° C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20° C, for a solution containing 78 g of benzene and 46 g of toluene in …
a. Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point b. The osmotic pressure of a solution is given by the equation π = CRT c. Decreasing order of …
(a) Acute (b) Obtuse (c) 90° (d) Zero Ans. a (3)
(a) Same in both the tubes (b) More in the tube of larger diameter (c) Less in the tube of smaller diameter (d) More in the tube of smaller diameter Ans. d (35)
κPa abd 45 κPa respectively. Vapour pressure of the solution obtained by mixing 25.0g of heptane and 35 g of octane will be a. 144.5 κPa b. 72.0 κPa c. 36.1 κPa d. 96. 2 κPa Ans. b (41)
a. 0.6 b. 0.5 c. 0.8 d. 0.4 Ans. d Explanation : In equimolar liquid mixture x = 0.5 x = 0.5 So, P = 0.5 x 150 + 0.5x 100 = 125 Now let y be the mole fraction …
(a) 0.1 m (b) 0.2 m (c) 0.98 m (d) Full length of the capillary tube Ans. (d) In the satellite, the weight of the liquid column is zero. So the liquid will rise up to the top of the …
a. Vapour pressure of the solvent b. Relative lowering of vapour pressure c. Lowering of vapour pressure d. All of these Ans. b Explanation : Ostwald-Walker dynamic method is used for measurement of relative lowering of vapour pressure. (9)
a. 250 mm, 550 mm b. 350 mm, 450 mm c. 350 mm, 700 mm d. 500 mm, 500 mm e. 550 mm, 250 mm Ans. e (11)
a. 0.8 b. 0.6 c. 0.4 d. 0.2 Ans. b (7)
(a) Bubble rises upwards because pressure at the bottom is less than that at the top. (b) Bubble rises upwards because pressure at the bottom is greater than that at the top. (c) As the bubble rises, its size increases …
Po , the vapour pressure of solution is a. 0.10 Po b. 1.10 Po c. 0.90 Po d. 0.99 Po Ans. c (7)
a. 49.50 b. 59.6 c. 69.5 d. 79.8 Ans. c (35)
The adjacent graph shows the extension (Δl) of a wire of length 1m suspended from the top of a roof at one end with a load W connected to the other end. If the cross sectional area of the wire …
a. 200 and 300 b. 300 and 400 c. 400 and 600 d. 500 and 600 Ans. c (4)
25° C are 200 mm Hg and 41.5mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5g of CHCl3 and 40g of CH2 Cl2 at the same temperature will be (Molecular mass of CHCl3 = 119.5u and molecular …
(a) OD (b) OC (c) OB (d) OA Answer-a (12)
(a) √3 (b) 1/√3 (c) 1/2 (d) √3/2 Answer-b (5)
CCl4 at 25° C is 143 mm of Hg. 0.5 g of a non-volatile solute is dissolved in 100 mL. CCl4 . Find the vapour pressure of the solution a. 141.93 mm b. 94.39 mm c. 199.34 mm d. 143.99 …