Solutions Test

Result

Solutions Test - 2

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?

A
80 torr

B
140 torr

C
72 torr

D
70 torr

Solution

P_total = p_P + p_Q = p^∘_Px_P + p^∘_Qx_Q
= 80 x 0.6 + 60 x 0.4 = 72 torr.
Question 2
4 / -1

X, Y and Z in the given graph are

A
X = p₁ + p₂, Y = 1, Z = 0

B
X = p₁ + p₂, Y = 0, Z = 0

C
X = p₁ × p₂, Y = 0, Z = 0

D
X = p₁ − p₂, Y = 1, Z = 0

Solution

Here, X = P_T = p₁+ p₂ = Total pressure of the solution.
p₁ and p₂ is the partial pressure of component 1 and 2 respectively.
Y = x₂ = mole fraction of component 2 in the liquid phase.
Z = y₂= mole fraction of component 2 in the vapour phase.
When mole fraction of component 2 in the liquid phase is 0 then mole fraction of component 2 in the vapour phase is also 0 which means the liquid is pure of component 1 only.
Question 3
4 / -1

Among the following substances, the lowest vapour pressure is exerted by

A
Water

B
Alcohol

C
Ether

D
Mercury

Solution

Mercury is non-volatile.
Question 4
4 / -1

In three beakers labelled as (A), (B) and (C), 100mL of water, 100mL of 1M solution of glucose in water and 100mL of 0.5M solution of glucose in water are taken respectively and kept at same temperature.

Which of the following statements is correct?

A
Vapour pressure in all the three beakers is same

B
Vapour pressure of beaker B is highest

C
Vapour pressure of beaker C is highest

D
Vapour pressure of beaker B is lower than that of C and vapour pressure of beaker C is lower than that of A

Solution

Vapour pressure of a solution containing non-volatile solute is less than that of the pure solvent. The decrease in vapour pressure depends upon the quantity of non-volatile solute present in it. Hence, vapour pressure of A > C > B.
Question 5
4 / -1

The given graph shows the vapour pressure-temperature curves for some liquids.

Liquids A, B, C and D respectively are

A
Diethyl ether, acetone, ethyl alcohol, water

B
Acetone, ethyl alcohol, diethyl ether, water

C
Water, ethyl alcohol, acetone, diethyl ether

D
Ethyl alcohol, acetone, diethyl ether, water

Solution

The vapour pressure increases with decrease in intermolecular forces. When the forces are weak, the liquid has high volatility and maximum vapour pressure. Diethyl ether has highest vapour pressure while water has lowest vapour pressure.