QUIZ - 1                LIQUID SOLUTION

1. PtCl4.6H2O can exist as a hydrated complex 1 molal aqueous solution has depression in freezingpoint of 3.72°. Assume 100% ionization and Kf(H2O) = 186° mol–1 kg then complex is(A) [Pt(H2O)6]Cl4 (B) [Pt(H2O)4Cl2]Cl2.2H2O (C) [Pt(H2O)3Cl3]Cl.3H2O (D) [Pt(H2O)2].4H2O

2. Mixture of volatile components A and B has total vapour pressure (in torr):

p = 254 – 135 xA- where xA is mole fraction of A in mixture hence 0Ap and 0

Bp are (in torr)

(A) 254, 119 (B) 119, 254 (C) 135, 254 (D) 154, 119

3 The relative lowering of vapour pressure of an aqueous solution of a nonvolatile solute of molecularweight 60 (which neither dissociates nor associates in the solution) is 0.018. If fK of water is

11.86 m , the depression in freezing point will be(A) 0.93°C (B) 3.72°C (C) 1.86°C (D) 0.018°C

4. Which of the following pairs of solution are isotonic at the same temperature?(A) 0.1 M Urea and 0.1 M NaCl (B) 0.1 M Urea and 0.2 M MgCl2 (C) 0.1 M NaCl and 0.1 M Na2SO4 (D) 0.1 M Ca(NO3)2 and 0.1 M Na2SO4

5. Which of the following behaviour is true about the ideal binary liquid solution?(A) Plot of P(total) against xA is non linear (B) Plot of P(total) against xB is linear (C) Plot of P(total) against xB is linear with slope = 0(D) Plot of P(total) against xA is linear with slope = 0

6 The vapour pressure of pure benzene at 25C is 639.7 mm. Hg and the vapour pressure of asolution of solute in benzene at 25C is 631.9 mm Hg. The molality of the solution is(A) 0.156 (B) 0.108 (C) 5.18 (D) 0.815

7. The ratio of the value of any colligative property for KCl solution to that for sugar is nearly ____times.(A) 1 (B) 0.5 (C) 2 (D) 2.5

8. For an ideal binary liquid solutions with 0 0A BP P , which relation between AX ? (mole fraction of A in

liquid phase) and AY (mole fraction of A in vapour phase) is correct.

(A) A AX Y (B) A AX Y (C) A AX Y (D) A A

B B

X Y

X Y

9 The freezing point of aqueous solution that contains 5% urea, 1% KCl and 10% of glucose by mass

is ( -1fK 1.86K molality , for KCl 100%).

(A) 290.2K (B) 285.5K (C) 269.93K (D) 250K

10. The relationship between osmotic pressure at 273 K when 10g glucose (P1), 10g urea (P2) and 10gsucrose (P3) are dissolved in 250 mL of water is:(A) P1 P2 P3 (B) P3 P2 P1 (C) P2 P1 P3 (D) P2 P3 P1

11 The lowering of vapour pressure of 0.1 M aqueous solution of NaCl, CuSO4 and K2SO4 are(A) All equal (B) In the ratio of 1:1:1.5(C) In the ratio 3:2:1 (D) In the ratio 1.5:1:2.5

12. In certain solvent, phenol dimerises to the extent of 60%. Its observed molecular mass in the solventshould be(A) 94 (B) 94 (C) = 94 (D) unpredictable

13. The plot ofA

1

X vs

A

1

Y (where XA and YB) are the mole fractions of A in liquid and vapour phases

respectively) is linear whose slope and intercept respectively are given as

(A) 0 00

A BA0 0B B

P PP,

P P

(B)

0 00B AA

0 0B B

P PP,

P P

(C)

0 00A BB

0 0A B

P PP,

P P

(D)

0 00B AB

0 0A B

P PP,

P P

14. Mole fraction of toluene in the vapour phase which is in equilibrium with a solution of benzene (p0=120 torr) and toluene (p0 = 80 torr) having 2.0 mole of each is:(A) 0.50 (B) 0.25 (C) 0.60 (D) 0.40

15. Distillate of vapours of a solution containing 2 moles of A ( oAP = 100 mm Hg) and 3 moles

of B ( oBP = 150 mm Hg) will have total vapour pressure, approximately, on condensation:

(A) 135 mm (B) 130 mm (C) 140 mm (D) 145 mm

16. An azeotropic solution of two liquids has a boiling point lower than either of them when it:(A) Shows negative deviation from Roault’s law (B) Shows positive deviation from Roault’s law(C) Shows ideal behaviour (D) is saturated

17. A student finds that 31.26 mL of a 0.165 M solution of barium hydroxide, Ba(OH)2, solution isrequired to just neutralize 25.00 mL of a citric acid, H3C6H5O7, solution. What is the concentration ofthe H3C6H5O7 solution?(A) 0.413 M (B) 0.309 M (C) 0.206 M (D) 0.138 M

18. What is the density (in g mL¯1) of a 3.60 M aqueous sulfuric acid solution that is 29.0% H2SO4 bymass?(A) 1.22 (B) 1.45 (C) 1.64 (D) 1.88

19. At 40°C, the vapour pressures in torr, of methyl alcohol - ethyl alcohol solution is represented by the

equation. P = 119XA + 135 where XA is mole fraction of methyl alcohol, then the value of AX 1

Lim

A

A

P

X is

(A) 254 torr (B) 135 torr (C) 119 torr (D) 140 torr

20. Two solutions of KNO3 and CH3COOH are prepared separately, molarity of both is 0.1M and osmoticpressure are P1 and P2 respectively. The correct relationship between the osmotic pressure is

(A) P2 > P1 (B) P1 = P2 (C) P1 > P2 (D) 2

1 2 1 2

PP

P P P P