Solutions Test

Result

Solutions Test - 33

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Weekly Quiz Competition

Question 1
4 / -1

The vapour pressure of a solvent decreases by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in vapour pressure is to be 20 mm of mercury ?

A
0.8

B
0.6

C
0.4

D
0.2

Solution
Question 2
4 / -1

The molal b.p. constant for water is 0.513^oC Kg mol^-1. When 0.1 mole of sugar is dissolved in 200g of water, the solution boils under a pressure of 1 atm at

A
100.513^oC

B
100.0513^oC

C
100.256^oC

D
101.025^oC

Solution
Question 3
4 / -1

The normal boiling point of water is 373 K (at 760 mm). Vapour pressure of water at 298 K is 23 mm. If enthalpy of vaporisation is 40.656 kJ mol^-1, the boiling point of water at 23 mm pressure will be

A
250 K

B
294.4 K

C
51.6 K

D
12.5 K

Solution
Question 4
4 / -1

The latent heat of vaporisation of water is 9700 cal/mole and if the b.p. is 100^oC, the ebullioscopic constant of water is

A
0.513^oC

B
1.026^oC

C
10.26^oC

D
1.832^oC

Solution
Question 5
4 / -1

The freezing point of a 0.05 molal solution of a non-electrolyte in water is

A
‒1.86^oC

B
‒ 0.93^oC

C
‒ 0.093^oC

D
0.93^oC

Solution
Question 6
4 / -1

The freezing point of 0.1 M solution of glucose is -1.86^oC. If an equal volume of 0.3 M glucose solution is added, the freezing point of the mixture will be

A
‒ 7.44^oC

B
‒ 5.58^oC

C
‒ 3.72^oC

D
‒ 2.79^oC

Solution
Question 7
4 / -1

The molal elevation constant of water = 0.52^oC. The boiling point of 1.0 molal aqueous KCl solution (assuming complete dissociation of KCl), should be

A
100.52^oC

B
101.04^oC

C
99.48^oC

D
98.96^oC

Solution
Question 8
4 / -1

In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionization is 0.3. Taking K_f for water as 1.85,the freezing point of the solution will be nearest to

A
‒0.360^oC

B
‒0.260^oC

C
+0.480^oC

D
‒0.480^oC

Solution
Question 9
4 / -1

The correct expression relating molality (m), molarity (M), density (d) and molar mass (M₂) of solute is

A

B

C

D
Question 10
4 / -1

The expression relating mole fraction of solute (x₂) and molarity (M) of the solution is

A

B

C

D