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

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A frame made of metallic wire enclosing a surface area $A$ is covered with a soap film. If the area of the frame of metallic wire is reduced by 50% , the energy of the soap film will be changed by

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Important Questions on States of Matter: Gases and Liquids

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

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:

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

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 -

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HARD

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

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.

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The correct option(s) is (are)

EASY

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

The work done during combustion of

9 \times 10^{- 2}

kg

of ethane,

C_{2} H_{6} (g)

300 K

is (Given

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

, atomic mass

C = 12, H = 1

)

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

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

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

A system consisting of 1 mol of an ideal gas undergoes a reversible process,

A \to B \to C \to A

(schematically indicated in the figure below). If the temperature at the starting point A is 300 K and the work done in the process

B \to C

is 1 L atm, the heat exchanged in the entire process in L atm is

Question Image

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

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

$(A)$ Question Image

$(B)$

$(C)$

$(D)$

EASY

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

An ideal gas undergoes isothermal expansion at constant pressure. During the process:

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

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.

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

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}

)

EASY

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

Calculate the work done during compression of

2

mol of an ideal gas from a volume of

1 m^{3}

10

{dm}^{3}

300 K

against a pressure of

100 kPa

EASY

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

The liquid having maximum surface tension is

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

X g

of ice at

0^{o} C

is added to 340g of water at

20^{o} C

. The final temperature of the resultant mixture is

5^{o} C

. The value of

X

(in g) is closest to

[Heat of fusion of ice

= 333 J / g

; Specific heat of water

= 4.184 J / g . K

]

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

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)

EASY

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

A gas undergoes change from state

A

to state

B

. In this process, the heat absorbed and work done by the gas is

5 J and 8 J

, respectively. Now gas is brought back to

A

by another process during which

3 J

of heat is evolved. In this reverse process of

B to A

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Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

A gas is allowed to expand in a well-insulated container against a constant external pressure of

2.5 atm

from an initial volume of

2.50 L

to a final volume of

4.50 L .

The change in internal energy

ΔU

of the gas in joules will be

MEDIUM

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

For the isothermal reversible expansion of an ideal gas

HARD

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

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:

EASY

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

The viscosity of a liquid can be decreased by

EASY

Chemistry>Physical Chemistry>States of Matter: Gases and Liquids>Viscosity and Surface Tension of Liquid

The

S . l

unit of coefficient of viscosity

(η)

is:

A frame made of metallic wire enclosing a surface area A is covered with a soap film. If the area of the frame of metallic wire is reduced by 50% , the energy of the soap film will be changed by

Important Questions on States of Matter: Gases and Liquids

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A frame made of metallic wire enclosing a surface area $A$ is covered with a soap film. If the area of the frame of metallic wire is reduced by 50% , the energy of the soap film will be changed by