Chemistry

a.  Low temperature b. Low atmospheric pressure c. High atmospheric pressure d. Both low temperature and high atomospheric pressure Ans. b Explanation : Low concentration of oxygen in the blood and tissues of people living at high altitude is due …

1.. Vapour pressure of a liquid is the measure of the strengh of intermolecular attttactive forces 2. Surface tension of a liquid acts perpendicular to the surface of the liquid 3. Vapour pressure of all liquid is same at their …

100° C the vapour pressure of a solution of 6.5g of a solute in 100 g water is 732mm. If Kb  = 0.52; the boiling point of this solution will be a. 101 ° C b. 100 ° C c. 102 …

a. 1 g b. 3g c. 6 g d. 18 g Ans. b (39)

a. HI b. HBr c. HCl d. HF Ans. c (12)

κPa and 4.556 κPa respectively, the composition of the vapour wll be a. 0.635 methanol, 0.365 ethanol b. 0.365 methanol, 0.635 ethanol c. 0.574 methanol, 0.326 ehanol d.  0.173 methanol, 0.827 Ans. b (51)

100°  C is a. 759.00 Torr b. 7. 60 Torr c. 76.00 Torr d. 752.40 Torr Ans. d (16)

a. Relative lowering of vapour pressure is independent b. The vapour pressure is a colligative property c. Vapour pressure of a solution is lower than the vapour pressure of the solvent d. The relative lowering of vapour pressure is directly …

cm3  of acetone is added to 100 cm3  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 …

a. Solute molecules 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 Ans. b …

a. Equal to that of water b. Equal to that of methanol c. More than that of water d. Less than that of water Ans. c Explanation : Methanol has low boiling point than H2 O lower is boiling point …

2985 N / m2 . The vapour pressure of pure water is 3000 N/ m2 . The molecular weight of the solute is a. 60 b. 120 c. 180 d. 380 Ans. c (13)

25 ° C .(Given : Vapour pressure Date at 25 ° C   benzene = 12.8 κPa, Toluene = 3.85 κPa ) a. The vapour will contain a higher percentage of benzene b. The vapour will contain a higher percentage of toluene …

2  ° C . Assuming concentration of solute is much lower than the concentration of solution is a. 724 b. 740 c. 736 d. 718 Ans. a (38)

a. Concentration of solution containing non-volatile solute b. Temperature upto boiling point c. Temperature upto triple point d. Altitude of the concerned place of boiling Ans : b (13)

PA o  : PB o  = 1 : 2  and have mole fraction in solution 1: 2 then mole fraction of A in vapours a. 0.33 b. 0.25 c. 0.52 d. 0.2 Ans. d (12)

80° C the vapour pressure of pure liquid ‘A’ is 520 mmHg and that of pure liquid ‘B’ is 1000 mmHg. If a mixture of solution ‘A’ and ‘B’ boils at 80° C and 1 atm pressure the amount of …

25 C is 23. 8 mm Hg a. 1.25 mm Hg b. 0.125 mm Hg c. 1.15 mm Hg d. 00.12 mm Hg Ans. b (12)

20° C are 440 mmHg for pentane and 120 mmHg for hexane. The mole fraction of pentane in the vapour phase would be a. 0.549 b. 0.200 c. 0.786 d. 0.478 Ans. d (13)

a. 1 M C12 H22 O11 b. 1 M CH3 COOH c. 1 M CaCl 2 d. 1 M NaCl Ans. a (13)

At a given temperature, which of the following statement is correct about the vapour pressure of pure water and that of NaCl solution a. Vapour pressure in container (A)  is more than that in container (B) b. Vapour pressure in …

0.1 °C  higher than that of the pure ether. The molecular weight of the substance will be be a. 148 b. 158 c. 168 d. 178 Ans. b (10)

CH4  and H2  are mixed in an empty container at 25° C. The fraction of the total pressure exerted by  H2 is a. 1/9 b. 1/2 c. 8/9 d. 16/17 Ans. c (15)

a. Same as that of 2nd   solution b. Nearly one fifth of the  2nd solution c. Double that of 2nd  solution d. Nearly five times that of 2nd solution Ans. a (15)

a. Vapour pressure of solute is zero b. Vapour pressure of solvent is zero c. Vapour pressure of solution is more than vapour pressure of solvent d. all of the options Ans. a Explanation : Non volatile solute always have …

Po and P are the vapour pressure of the pure solvent and solution and n1  and n2 are the moles of solute and solvent  respectively in the solution then the correct relation between P and Po  is a. Po = …

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)

PA   and PB  are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If XA represents the mole fraction of component A, the total pressure of the solution will be a.   PA + …

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. 140 torr b. 20 torr c. 68 torr d. 72 torr Ans. d (57)

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. Lower b. Higher c. Both d.None Ans. a   (4)

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 …

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 (42)

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 …