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The refrigerator works on Clausius' statements of the second law of thermodynamics.

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Important Questions on Thermodynamics

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Consider the following liquid - vapour equilibrium.

L i q u i d ⇌ V a p o u r

Which of the following relations is correct?

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

State the second law of thermodynamics.

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

The second law of thermodynamics states that, _______.

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10

d m^{3}

to a volume of 100

d m^{3} a t 27 ℃

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

When steam condenses to water at $90 ° C$ , the entropy of the system decreases. What must be true if the second law of thermodynamics is to be satisfied?

[Hint: For a spontaneous process ${ΔS}_{universe}$ must be positive.]

HARD

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Some substances possess some residual entropy even at absolute zero. This is because

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Identify the correct statement regarding a spontaneous process:

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

When the total disorder increases, the change is said to be _____.

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

If the entropy of evaporation of a liquid is

100 {JK}^{- 1} {mol}^{- 1}

and its enthalpy of vaporisation is

50 kJ {mol}^{- 1}

, the boiling point of the liquid is-

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Three engines

A, B

and

C

take steam at

130 ° C

, and reject it at

20 ° C

40 ° C

and

50 ° C

, respectively. The most efficient engine would be

HARD

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

The entropy

(S °)

of the following substances are:

{CH}_{4} (g) : 186.2 J K^{- 1} {mol}^{- 1} O_{2} (g) : 205.0 J K^{- 1} {mol}^{- 1} {CO}_{2} (g) : 213.6 J K^{- 1} {mol}^{- 1} H_{2} O (l) : 69.9 J K^{- 1} {mol}^{- 1}

The entropy change

(∆ S °)

for the reaction,

{CH}_{4} (g) + 2 O_{2} (g) \to {CO}_{2} (g) + 2 H_{2} O (l)

is :

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

The maximum efficiency of a steam engine operating between

100 ° C

and

25 ° C

is:

HARD

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Which of the following thermodynamic relation is correct?

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Consider entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

A heat engine absorbs heat

Q_{1}

at temperature

T_{1}

and heat

Q_{2}

at temperature

T_{2}

. Work done by the engine is

(Q_{1} + Q_{2}) J

. This data

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

A piece of ice kept at room temperature melts of its own. This reaction is governed by which law?

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Enthalpy (

∆

H) for the reaction,

Zn + 2 AgCl \to {ZnCl}_{2} + 2 Ag at 300 K temperature is - 218 KJ / mole

and emf of the cell was

1 .015 V \cdot Then the vaule of {(\frac{dE}{dT})}_{p}

of the cell is?

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

When you freeze water in your freezer to make ice cubes, the amount of order in the molecules of water increases. However, second law of thermodynamics says that the amount of order in the isolated system can only stay constant or decrease with time. How can thus making of ice violate second law ?

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

A piece of ice kept at room temperature melts on its own . This reaction is governed by which law?

HARD

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

The efficiency of the reversible cycle in the given figure is
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The refrigerator works on Clausius' statements of the second law of thermodynamics.

Important Questions on Thermodynamics

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