The difference between C ¯ p and C ¯ V is C ¯ p and C ¯ V signify molar quantities]

larger in case of gases in comparison to solids and liquids

larger in case of liquids in comparison to gases and solids

larger in case of solids in comparison to gases liquids

equal in solids, liquids and gases

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A container is filled with $20$ moles of an ideal diatomic gas at absolute temperature $T .$ When heat is supplied to gas temperature remains constant but $8$ moles dissociates into atoms. Heat energy supplied to gas is?

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Important Questions on Thermodynamics

EASY

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

At constant pressure, the heat of formation of a compound is not dependent on temperature, when

EASY

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

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

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

Two moles of helium gas is mixed with three moles of hydrogen molecules (taken to be rigid). What is the molar specific heat of mixture at constant volume?

(R = 8.3 J / m o l K)

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

An ideal gas in a thermally insulated vessel at internal pressure =

P_{1}

, volume =

V_{1}

and absolute temperature =

T_{1}

expands irreversibly against zero external pressure, as shown in the diagram. The final internal pressure, volume and absolute temperature of the gas are

P_{2}

V_{2}

and

T_{2}

, respectively. For this expansion,

Question Image

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

For the isothermal reversible expansion of an ideal gas

EASY

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

A gas can expand from

100 mL

250 mL

under a constant pressure of

2 atm

. The work done by gas is

EASY

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

An ideal gas is allowed to expand from

1 L

10 L

against a constant external pressure of

1

bar. The work done in

k J

is:

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

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>Thermodynamics>Internal Energy

A thermally insulated rigid container of

1 L

volume contains a diatomic ideal gas at room temperature. A small paddle installed inside the container is rotated from the outside, such that the pressure rises by

10^{5} Pa

. The change in internal energy is close to

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

What will be the heat change at constant volume fo the reaction whose heat change at constant pressure is

- 560 kcal

27 ° C ?

The reaction is:

C_{8} H_{16} + 12 O_{2} \to 8 {CO}_{2} + 8 H_{2} O

(Given

R = 2 {calmol}^{- 1} K^{- 1})

EASY

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

The difference between

{\bar{C}}_{p}

and

{\bar{C}}_{V}

[{\bar{C}}_{p}

and

{\bar{C}}_{V}

signify molar quantities]

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

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

EASY

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

Calculation the maximum work done in expanding

16 g

of oxygen at

300 K

and occupying a volume of

5 {dm}^{3}

isothermally until volume becomes

25 {dm}^{3}

EASY

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

The quantity of heat (in $J$ ) required to raise the temperature of $1.0 k g$ of ethanol from $293.45 K$ to the boiling point and then change the liquid to vapor at that temperature is closest to [Given, boiling point of ethanol $351.45 K$ . Specific heat capacity of liquid ethanol $2.44 J g^{- 1} K^{- 1}$ . Latent heat of vaporisation of ethanol $855 J g^{- 1}$ ]

EASY

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

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}

)

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

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

$(A)$ Question Image

$(B)$

$(C)$

$(D)$

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Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

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>Thermodynamics>Internal Energy

Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?

EASY

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

For one mole of an ideal gas, which of these statements must be true?
(a) Internal energy

(U)

and enthalpy

(H)

each depends on temperature.
(b) Compressibility factor

Z

is not equal to 1
(c)

C_{P, m} - C_{V, m} = R

(d)

dU = C_{v} dT

for any process

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Internal Energy

5

moles of an ideal gas at

100 K

are allowed to undergo reversible compression till its temperature becomes

200 K .

C_{V} = 28 J K^{- 1},

calculate

∆ U

and

∆ p V

for the process.

(R = 8.0 J K^{- 1} m o l^{- 1})

A container is filled with 20 moles of an ideal diatomic gas at absolute temperature T. When heat is supplied to gas temperature remains constant but 8 moles dissociates into atoms. Heat energy supplied to gas is?

Important Questions on Thermodynamics

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A container is filled with $20$ moles of an ideal diatomic gas at absolute temperature $T .$ When heat is supplied to gas temperature remains constant but $8$ moles dissociates into atoms. Heat energy supplied to gas is?