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IMPORTANT

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The process with negative entropy change is:

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Important Questions on Thermodynamics

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Thermodynamics>JEE Main - 10th January 2019 Shift 2>Q 67

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:

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Thermodynamics>JEE Main - 10th January 2019 Shift 1>Q 68

A process has

Δ H = 200 J m o l^{- 1}

and

Δ S = 40 J K^{- 1} m o l^{- 1} .

Out of the values given below choose the minimum temperature above which the process will be spontaneous:

EASY

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Thermodynamics>JEE Main - 10th April 2019 Shift 2>Q 69

The difference between

∆ H

and

∆ U

(∆ H - ∆ U)

, when the combustion of one mole of heptane

(l)

is carried out at a temperature

T

, is equal to:

EASY

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Thermodynamics>JEE Main - 10th April 2019 Shift 1>Q 70

A process will be spontaneous at all temperatures if:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Thermodynamics>JEE Main - 10th April 2016>Q 71

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})

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Thermodynamics>JEE Main - 10th April 2015>Q 72

The heat of atomization of methane and ethane are

360 kJ {mol}^{- 1}

and

620 kJ {mol}^{- 1}

, respectively. The longest wavelength of light capable of breaking the

C - C

bond is (Avogadro's number

= 6.023 \times 10^{23}, h = 6.62 \times 10^{- 34} J s

)

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Thermodynamics>JEE Main - 1 September 2021 Shift 2>Q 73

For the reaction

2 {NO}_{2} (g) ⇌ N_{2} O_{4} (g),

when

ΔS = - 176.0 J K^{- 1}

and

ΔH = - 57.8 kJ {mol}^{- 1}

the magnitude of

ΔG

298 K

for the reaction is _____

{kJmol}^{- 1}

. (Nearest integer)

MEDIUM

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Thermodynamics>JEE Main - 24 June 2022 Shift 2>Q 74

At $25 ° C$ and $1$ atm pressure, the enthalpies of combustion are as given below:

Substance	$H_{2}$	$C$ (graphite)	$C_{2} H_{6} (g)$
$\frac{Δ_{c} H^{Θ}}{{kJmol}^{- 1}}$	$- 286.0$	$- 394.0$	$- 1560.0$

The enthalpy of formation of ethane is

The process with negative entropy change is:

Important Questions on Thermodynamics

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