MEDIUM

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Write Kelvin Planck's statements of the second law of thermodynamics.

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.

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

In a reversible process, the change in entropy of the universe is

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

Define the following: Second law of thermodynamics.

HARD

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

The criterion of spontaneity in terms of Gibbs energy is the same as that laid down by second law of thermodynamics. How?

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

HARD

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Which of the following thermodynamic relation is correct?

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-

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

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

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

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

State second law of thermodynamics in terms of entropy and express it mathematically.

EASY

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Identify the correct statement regarding a spontaneous process:

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 of its own. This reaction is governed by which law?

MEDIUM

Chemistry>Physical Chemistry>Thermodynamics>Second Law of Thermodynamics

Enthalpy (