Statement = C P - C V = R for an ideal gas Explanation = ∂ U ∂ V T = 0 for an ideal gas.

Both S and E are correct and E is not correct explanition

Both S and E are correct and E is correct explanation of S

Statement = C P - C V = R for an ideal gas Explanation = ∂ U ∂ V T = 0 for an ideal gas.

Both S and E are correct and E is not correct explanition

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

EASY

Earn 100

Statement = $C_{P} - C_{V} = R$ for an ideal gas

Explanation $= {(\frac{\partial U}{\partial V})}_{T} = 0$ for an ideal gas.

50% studentsanswered this correctly

Important Questions on Thermodynamics

HARD

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

The molar heat capacity for an ideal gas at constant pressure is $20.785 J K^{- 1} {mol}^{- 1}$ . The change in internal energy is $5000 J$ upon heating it from $300 K$ to $500 K$ . The number of moles of the gas at constant volume is____

(Given: $R = 8.314 J K^{- 1} {mol}^{- 1}$ )

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

$200 mL$ of $0.2 M HCl$ is mixed with $300 mL$ of $0.1 M NaOH .$ The molar heat of neutralization of this reaction is $- 57.1 kJ .$ The increase in temperature in ${}^{\circ}C$ of the system on mixing is $x \times 10^{- 2} .$ The value of $x$ is (Nearest integer)

[Given: Specific heat of water $= 4.18 J g^{- 1} K^{- 1}$

Density of water $= 1.00 g {cm}^{- 3}$ ]

(Assume no volume change on mixing)

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

$A$ fish swimming in water body when taken out from the water body is covered with a film of water of weight $36 g$ . When it is subjected to cooking at $100 ° C$ , then the internal energy for vaporization in ${kJmol}^{- 1}$ is integer]

[Assume steam to be an ideal gas. Given $Δ_{vap} H^{⊖}$ for water at $373 K$ and $1$ bar is $41.1 kJ {mol}^{- 1} : R = 8.31 J K^{- 1} {mol}^{- 1}$ ]

HARD

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

The specific heat of a certain substance is $0.86 J g^{- 1} K^{- 1}$ . Assuming ideal solution behavior, the energy required (in $J$ ) to heat $10 g$ of $1$ molal of its aqueous solution from $300 K$ to $310 K$ is closest to :

[Given: molar mass of the substance $= 58 g {mol}^{- 1}$ ; specific heat of water $= 4.2 J g^{- 1} K^{- 1}$ ]

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

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>Applications of Thermodynamics: Enthalpy

When a

60 W

electric heater is immersed in a gas for

100 s

in a constant volume container with adiabatic walls, the temperature of the gas rises by

5 ° C

. The heat capacity of the given gas is

{JK}^{- 1}

(Nearest integer)

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

A piece of metal weighing

100 g

is heated to

80 ° C

and dropped into

1 kg

of cold water in an insulated container at

15 ° C

. If the final temperature of the water in the container is

15.69 ° C

, the specific heat of the metal in

J / g ° C

. is

EASY

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

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

)

EASY

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

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

EASY

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

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 $855 J g^{- 1}$ ]

HARD

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

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>Applications of Thermodynamics: Enthalpy

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

]

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

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>Thermodynamics>Applications of Thermodynamics: Enthalpy

Which of the following relation is not correct?

HARD

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

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)

EASY

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

100 mole

H_{2} O_{2}

decompose at

1 bar

and

300 K

, the work is done (

kJ

) by one mole of

O_{2} (g)

as it expands against

1 bar

pressure is:

2 H_{2} O_{2} (l) ⇌ 2 H_{2} O (l) + O_{2} (g)

(R = 8 .3 J K^{- 1} {mol}^{- 1})

EASY

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

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

EASY

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

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>Applications of Thermodynamics: Enthalpy

At constant volume,

4 m o l

of an ideal gas when heated from

300 K

500 K

changes its internal energy by

5000 J .

The molar heat capacity at constant volume is ________

EASY

Chemistry>Physical Chemistry>Thermodynamics>Applications of Thermodynamics: Enthalpy

Which of the following process best describes atomization of

C H_{4} (g) ?

Statement = CP-CV=R for an ideal gas Explanation =∂U∂VT=0 for an ideal gas.

Important Questions on Thermodynamics

Learn and Prepare for any exam you want !

Statement = $C_{P} - C_{V} = R$ for an ideal gas

Explanation $= {(\frac{\partial U}{\partial V})}_{T} = 0$ for an ideal gas.