A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 3 7 . 0 ∘ C . As it does so, it absorbs 208 J of heat. The values of q and w for the process will be (R = 8.314 J/mol K) (ln7.5 = 2.01)

q = + 2 0 8 J , w ⁡ = - 2 0 8 J

q = + 2 0 8 J , w ⁡ = + 2 0 8 J

q = - 2 0 8 J , w ⁡ = - 2 0 8 J

MEDIUM

Earn 100

Pick out the wrong statement(s).
(i) Vapour pressure of a liquid is the measure of the strength of intermolecular attractive forces.
(ii) Surface tension of a liquid acts perpendicular to the surface of the liquid.
(iii) Vapour pressure of all liquids is same at their freezing points.
(iv) Liquids with stronger intermolecular attractive forces are more viscous than those with weaker intermolecular force.

50% studentsanswered this correctly

Important Questions on States of Matter

HARD

Chemistry>Physical Chemistry>States of Matter>Liquid State

A graph of vapour pressure and temperature for three different liquids

X, Y

and

Z

is shown below:
Question Image

The following inferences are made:

(A) X

has higher intermolecular interactions compared to

Y .

(B) X

has lower intermolecular interactions compared to

Y .

(C) Z

has lower intermolecular interactions compared to

Y .

The correct inferences is/are:

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

1 kg

of water, at

20 ° C

is heated in an electric kettle whose heating element has a mean (temperature averaged) resistance of

20 Ω .

The rms voltage in the mains is

200 V

. Ignoring heat loss from the kettle, time taken for water to evaporate fully is close to
[ Specific heat of water

= 4200 J {kg}^{- 1} ° C^{- 1}

Latent heat of water

= 2260 k J k g^{- 1}

]

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

Given, van der Waal's constant for

{NH}_{3}, H_{2}, O_{2}

and

{CO}_{2}

are respectively

4.17, 0.244, 1.36 and 3.59

. Which one of the following gases is most easily liquefied?

HARD

Chemistry>Physical Chemistry>States of Matter>Liquid State

An ideal gas undergoes a cyclic process as shown in the figure
Question Image

∆ U_{BC} = - 5 {KJmol}^{- 1}, q_{AB} = 2 {KJmol}^{- 1}

W_{AB} = - 5 {KJmol}^{- 1}, W_{CA} = 3 {KJmol}^{- 1}

Heat absorbed by the system during process

CA

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

The units of surface tension and viscosity of a liquid, respectively, are

EASY

Chemistry>Physical Chemistry>States of Matter>Liquid State

One mole of an ideal monatomic gas is compressed isothermally in a rigid vessel to double its pressure at room temperature,

27^{o} C

. The magnitude of work done on the gas will be:

EASY

Chemistry>Physical Chemistry>States of Matter>Liquid State

Latent heat of vaporisation of water is

22.6 \times 10^{5} J {kg}^{- 1}

. The amount of heat needed to convert

100 kg

of water into vapour at

100 ° C

HARD

Chemistry>Physical Chemistry>States of Matter>Liquid State

A reversible cyclic process for an ideal gas is shown below. Here,

P, V, a n d T

are pressure, volume and temperature, respectively. The thermodynamic parameters

q, w, H a n d U

are heat, work, enthalpy and internal energy, respectively.

Question Image

The correct option(s) is (are)

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

Based on the given figure, the number of correct statement/s is/are

Question Image

A. Surface tension is the outcome of equal attractive and repulsion forces acting on the liquid molecule in bulk.

B. Surface tension is due to uneven forces acting on the molecules present on the surface.

C. The molecule in the bulk can never come to the liquid surface.

D. The molecules on the surface are responsible for vapour pressure if the system is a closed system.

EASY

Chemistry>Physical Chemistry>States of Matter>Liquid State

A piece of ice falls from a height

h

so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of

h

is:
(Latent heat of ice is

3.4 \times 10^{5} {J kg}^{- 1}

and

g = 10 {N kg}^{- 1}

)

HARD

Chemistry>Physical Chemistry>States of Matter>Liquid State

Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures

T_{1}

and

T_{2} (T_{1} < T_{2})

. The correct graphical depiction of the dependence of work done

(w)

vs the final volume

(V)

is:

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KCl,

C H_{3} O H

and

C H_{3} {(C H_{2})}_{11} O S O_{3}^{-} N a^{+}

at room temperature. The correct assignment of the sketches is -

Question Image

HARD

Chemistry>Physical Chemistry>States of Matter>Liquid State

An ideal gas undergoes isothermal compression from

5 m^{3}

1 m^{3}

against a constant external pressure of

4 N m^{- 2}

. The heat released in this process is

24 J {mol}^{- 1} K^{- 1}

and is used to increase the pressure of

1

mole of

Al

. The temperature of

Al

increases by:

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

Calculate the work done during combustion of

0 .138 kg

of ethanol,

(C_{2} H_{5} OH (l))

at at

300 K.

Given:

R = 8 .314 {Jk}^{- 1} {mol}^{- 1}

and molar mass of ethanol

= 46 g {mol}^{- 1}

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

The combination of plots which does not represent isothermal expansion of an ideal gas is

$(A)$ Question Image

$(B)$

$(C)$

$(D)$

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of

37 . 0^{\circ} C

. As it does so, it absorbs 208 J of heat. The values of q and w for the process will be
(R = 8.314 J/mol K) (ln7.5 = 2.01)

HARD

Chemistry>Physical Chemistry>States of Matter>Liquid State

The above

P - V

diagram represents the thermodynamic cycle of an engine, operating with an ideal mono-atomic gas. The amount of heat, extracted from the source in a single cycle, is:

EASY

Chemistry>Physical Chemistry>States of Matter>Liquid State

A closed bottle containing water at

30^{o} C

is open on the surface of the moon. Then-

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

A liquid does not wet the solid surface if angle of contact is:

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Liquid State

35^{o} C,

the vapour pressure of

C S_{2},

512 mmHg

and that of acetone is

144 m m H g .

A solution of

C S_{2}

in acetone has a total vapour pressure of

600 m m H g

. The false statement amongst the following is:

Important Questions on States of Matter

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