Solutions Test

Result

Solutions Test - 17

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Weekly Quiz Competition

Question 1
4 / -1

A and B are ideal gases. The molecular weights of A and B are in the ratio of 1: 4. The pressure of a gas mixture containing equal weights of A and B is p atm. What is the partial pressure (in atm) of B in the mixture ?

A

B

C

D

Solution
Question 2
4 / -1

In a mixture of A and B, components show negative deviation when

A
A—B interaction is stronger than A —A and B —B interaction

B
A —B interaction is weaker than A— A and B — B interaction

C
∆V_mix > 0, ∆S_mix > 0

D
∆V_mix = 0, ∆S_mix > 0
Question 3
4 / -1

If the elevation in boiling point of a solution of 10 g of solute (mol. wt =100) in 100 g of water is ∆T_b , the ebullioscopic constant of water is

A
10

B
100 T_b

C
∆T_b

D
∆T_b ⁄₁₀

Solution
Question 4
4 / -1

If the osmotic pressure of a 0.010 M aqueous solution of sucrose at 27° C is 0.25 atm, then the osmotic pressure of a 0.010 M aqueous solution of NaCl at 27° C is

A
0.062 atm

B
0.12 atm

C
0.25 atm

D
0.50 atm
Question 5
4 / -1

A solution of 1.25 g of P in 50 g of water lower freezing point by 0.3° C. Molar mass of P is 94, K_f (water) =1.86 K kg mol^-1 . The degree of association of P in water is

A
80%

B
60%

C
65%

D
75%
Question 6
4 / -1

Glucose is mixed in 1 litre water, the ratio of ∆T_f/ K_f changed to 10^-3. The mass of glucose (C₆H₁₂O₆ ) is

A
180 gram

B
18 gram

C
1.8 gram

D
0.18 gram

Solution
Question 7
4 / -1

The molar mass of a solute X in g mol^-1, if its 1% solution is isotonic with a 5% solution of cane sugar (molar mass = 342 g mol^-1) is

A
68.4

B
34.2

C
136.2

D
171.2

Solution
Question 8
4 / -1

Find the boiling point of a solution of 5.00 g of napthalene (C₁₀ H₈ ) in 100 g of benzene. K_b of benzene if 2.53°c/ m the normal boiling point of benzene = 80° C.

A
81°C

B
85°C

C
0.9°C

D
79°C
Question 9
4 / -1

Which among the following is a non-colligative property

A
elevation in boiling point

B
osmotic pressure

C
refractive index

D
lowering of vapour pressure
Question 10
4 / -1

45 g of ethylene glycol (C₂H₆O₂) is mixed with 600 g of water, what is depression in freezing point?

A
7.9 K

B
2.5 K

C
6.6 K

D
2.2 K