States of Matter Test

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States of Matter Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

The vapour pressure of pure $$CHCl_{3}$$ and $$CH_{2}Cl_{2}$$ are $$200$$ and $$41.5\ atm$$ respectively. The weight of $$CHCl_{3}$$ and $$CH_{2}Cl_{2}$$ are respectively $$11.9\ g$$ and $$17\ gm$$. The vapour pressure of solution will be

A
$$80.5$$

B
$$79.5$$

C
$$94.3$$

D
$$105.5$$

Solution

$$P_{CHCl_{3}}{0} = 200\ atm\ P_{CH_{3}Cl_{2}}{0} = 41.5\ atm$$
$$n = \dfrac {11.9}{119}\ n = \dfrac {17}{85}$$
$$= .1\ = .2$$
$$P_{T} = P_{A}^{0} X_{A} + P_{B}^{0} X_{B}$$
$$= 200x \dfrac {0.1}{.3}\ + \dfrac {41.5\times 0.2}{.3}$$
$$= 94.33$$.
Question 2
1 / -0

On increasing the altitude at constant temperature, vapour pressure of liquid

A
increases

B
decreases

C
remains the same

D
depends upon climate

Solution

Vapour pressure is a temperature dependent phenomena and it does not change unless temperature is changed. On increasing altitude, the outside pressure decreases and to maintain that the rate of evaporation and condensation also changes which keeps vapour pressure constant. So answer is option C.
Question 3
1 / -0

The vapour pressure of pure $$M$$ and $$N$$ are $$700$$mm of $$Hg$$ and $$450 mm$$ of $$Hg$$ respectively.which of the following option is correct?
Given :$$X_N,X_M$$- mole fraction of $$N$$ and $$M$$ in liquid phase
$$Y_N,Y_M$$= mole fraction of $$N$$ and $$M$$ in vapour phase.

A
$$X_M-X_N>Y_M-Y_N$$

B
$$\dfrac{X_M}{X_N}>\dfrac{Y_M}{Y_N}$$

C
$$\dfrac{X_M}{X_N}<\dfrac{Y_M}{Y_N}$$

D
$$\dfrac{X_M}{X_N}=\dfrac{Y_M}{Y_N}$$

Solution

Solution:- (C) $$\dfrac{X_M}{X_N}<\dfrac{Y_M}{Y_N}$$
Mole fraction of more voltatile component increase in vapour phase, i.e.,
$$P_N^o<P_M^o$$
Question 4
1 / -0

In the ideal gas equation, the gas constant $$R$$ has the dimensions of:

A
$$mole-atm \ K$$

B
$$litre \ mole$$

C
$$litre-atm \ K- mole$$

D
$$erg \ K$$

Solution

$$PV = nRT \ R = \dfrac {PV} {nT} = litre . atm. K- mole$$
Question 5
1 / -0

A closed vessel contains equal number of nitrogen and oxygen molecules at a pressure of $$p\ mm$$. If nitrogen is removed from the system then the pressure will be:

A
$$p$$

B
$$2p$$

C
$$p/2$$

D
$$p^2$$

Solution

At constant $$V, P\propto n$$

$$\therefore$$ if no. of moles is halved then pressure will also reduce to $$p/2$$.

Option C is correct.
Question 6
1 / -0

$$\Delta_f G^{\circ}$$ at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcal $$mol^{-1}$$ respectively. Vapour pressure of liquid 'S'' at 500 K is approximately equal to:

$$R = 2 cal K^{-1} mol^{-1}$$

A
10 atm

B
0.1 atm

C
1 atm

D
100 atm

Solution
Question 7
1 / -0

Equal weights of methane and hydrogen are mixed in an empty container at $$25^oC$$. The fraction of the total pressure exerted by hydrogen is

A
$$1/2$$

B
$$8/9$$

C
$$1/9$$

D
$$16/17$$

Solution

$$\dfrac{n_{CH_2}}{n_{H_2}}=\dfrac{M_{H_2}}{M_{CH_2}}$$ ( for equal not ) $$=\dfrac{2}{16}=\dfrac{1}{8}$$

$$\dfrac{n_{H_2}}{n_{CH_4}}=\dfrac{8}{1}\Rightarrow \dfrac{n_{H_2}}{n_{total}}=\dfrac{8}{9}=X_{H_2}$$

$$\therefore P_{H_2}=X_{H_2}P_{total}\Rightarrow X_2 =\dfrac{P_{H_2}}{P_{total}}=\dfrac{8}{9}$$

Option B
Question 8
1 / -0

The translational kinetic energy of an ideal gas depends only on its:

A
Pressure

B
Force

C
Temperature

D
Molar mass

Solution

$$K.E. = \dfrac {3RT}{2}$$ it means that the Translational Kinetic energy of Ideal gas depends upon temperature only.
Question 9
1 / -0

Kinetic energy of a gas depends upon its:

A
Molecular mass

B
Atomic mass

C
Equivalent mass

D
None of these

Solution

Kinetic energy $$ =\dfrac {3}{2} RT$$

Hence, option D is correct.
Question 10
1 / -0

Which of the following gas mixture is not applicable to Dalton's law of partial pressure?

A
$$SO_{2}$$ and $$Cl_{2}$$

B
$$CO_{2}$$ and $$N_{2}$$

C
$$CO$$ and $$CO_{2}$$

D
$$CO$$ and $$N_{2}$$

Solution

Mixture of $$SO_{2}$$ and $$Cl_{2}$$ are reacted chemically and forms $$SO_{2}Cl_{2}$$.

That is why mixture of these gases is not applicable for Dalton's law.

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Re-Attempt Weekly Quiz Competition

States of Matter Test - 49

Result

States of Matter Test - 49

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SHARING IS CARING

Question 1

$$80.5$$

$$79.5$$

$$94.3$$

$$105.5$$

Solution

Question 2

increases

decreases

remains the same

depends upon climate

Solution

Question 3

$$X_M-X_N>Y_M-Y_N$$

$$\dfrac{X_M}{X_N}>\dfrac{Y_M}{Y_N}$$

$$\dfrac{X_M}{X_N}<\dfrac{Y_M}{Y_N}$$

$$\dfrac{X_M}{X_N}=\dfrac{Y_M}{Y_N}$$

Solution

Question 4

$$mole-atm \ K$$

$$litre \ mole$$

$$litre-atm \ K- mole$$

$$erg \ K$$

Solution

Question 5

$$p$$

$$2p$$

$$p/2$$

$$p^2$$

Solution

Question 6

10 atm

0.1 atm

1 atm

100 atm

Solution

Question 7

$$1/2$$

$$8/9$$

$$1/9$$

$$16/17$$

Solution

Question 8

Pressure

Force

Temperature

Molar mass

Solution

Question 9

Molecular mass

Atomic mass

Equivalent mass

None of these

Solution

Question 10

$$SO_{2}$$ and $$Cl_{2}$$

$$CO_{2}$$ and $$N_{2}$$

$$CO$$ and $$CO_{2}$$

$$CO$$ and $$N_{2}$$

Solution

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