States of Matter Test

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States of Matter Test - 71

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Weekly Quiz Competition

Question 1
1 / -0

If $${X_A}$$ and $${X_B}$$ represent mole fraction in liquid phase while $${y_A}$$ and $${y_B}$$ represent mole fraction in vapour phase in binary solution. Which of the following statements is/are correct?

A
At point C liquid and vapour phase have same composition

B
Vapour pressure of B is less than A

C
Intermolecular forces in the solution are weaker than between like particles

D
All of these
Question 2
1 / -0

Henry's law constant K of $$CO_{2}$$ in water at $$20^{\circ}C$$ is $$3.0\times 10^{-2}molL^{-1}atm^{-1}$$. Calculate the mass of $$CO_{2}$$ present in 100 L of soft drink bottled with a partial pressure of $$CO_{2}$$ of 4 atm at the same temperature

A
5.28 g

B
12.0 g

C
428 g

D
528 g

Solution
Question 3
1 / -0

Two liquids A & B form an ideal solution. What is the vapour pressure of solution containing 2 moles of A and 3 moles of B at 300 K? [Given: At 300 K, Vapour pr. of pure liquid A $$\left( P\begin{matrix} 0 \\ A \end{matrix} \right) $$=100 torr, Vapour pr. of pure liquid B $$\left( P\begin{matrix} 0 \\ B \end{matrix} \right) $$=300 torr]

A
200 torr

B
140 torr

C
180 torr

D
None of these

Solution
Question 4
1 / -0

According to kinetic theory of gases:

A
Collisions are always elastic.

B
Heavier molecules transfer more momentum to the wall of the container.

C
Only a small number of molecules have very high velocity.

D
Between collisison the molecules move in straight lines with constant velocities.
Question 5
1 / -0

1.2 L of oxygen at a constant pressure of 2.00 atm was kept in a cylinder and provided 10.00 K cal of heat. The volume of oxygen increases to 1.8 L. The value of $$ \Delta E $$ is

A
9.970 Kcal

B
0.9970 Kcal

C
10.100 Kcal

D
10.970 Kcal

Solution
Question 6
1 / -0

Find the slope of the curve plotted between $$\mathrm { P }$$ Vs $$T$$ for closed container of volume $$2$$$$\mathrm { L }$$ having same moles of gas:

A
$$\dfrac { e } { 2000 }$$

B
$$2000$$$$\mathrm { e }$$

C
$$500$$$$\mathrm { e }$$

D
$$\dfrac { 2} { 1000 e }$$
Question 7
1 / -0

The law which suggests $$n_1 = n_2$$ for two solutions at same temperature and pressure is

A
van't Haff - avogadro's law

B
van't Hoff Boyle's law

C
van't Hoff's law

D
Henry's law

Solution
Question 8
1 / -0

An ideal solution contains two volatile liquids $$A (P^0=100 \ torr)$$. If the mixture contains 1 mole of A and 3 moles of B, the total vapour pressure of distillate is:

A
150 torr

B
188.88 torr

C
185.72 torr

D
198.88 torr
Question 9
1 / -0

An ideal gas obeying kinetic theory of gases can be liquified, if?

A
Its temperature is more than critical temperature $$T_c$$

B
Its pressure is more than critical pressure $$P_c$$

C
Its pressure is more than $$P_c$$ at a temperature less than $$T_c$$

D
It cannot be liquified at any value of P and T

Solution
Question 10
1 / -0

In a mixture of $$A$$ and $$B$$, having vapour pressure of pure $$A$$ and pure $$B$$ as $$400mm\, Hg$$ and $$600mm\, Hg$$ respectively, mole fraction of $$B$$ in liquid phases is $$0.5$$. Calculate total vapour pressure and mole fraction of $$A$$ and $$B$$ in vapour phases.

A
$$500, 0.4, 0.6$$

B
$$500, 0.5, 0.5$$

C
$$450, 0.4, 0.6$$

D
$$450, 0.5, 0.5$$

Solution

$$P_T = X_AP_{A^o} + X_BP_{B^o}$$
$$= 0.5\times 400+0.5\times 600$$
$$=500nm$$ of $$Hg$$
$$\dfrac{1}{P_T} = \dfrac{y_A}{P^o_A} + \dfrac{1-y_B}{P^o_B}$$
$$y_A = 0.6$$ & $$y_B = 1 -0.6 = 0.4$$