When 1 mole of an ideal gas at 20 atm pressure and 15 L volume expands such that the final pressure becomes 10 atm and the final volume become 60 L. Calculate entropy change for the process (Cpm = 30.96 J mole–1 K–1)

(1) 80.2 J.klmo1–1

(2) 62.42 kJ.k–1 mol–1

(3) 120 x 102 J1c1mol–1

(4) 27.22 J.k–1mor

Concept Questions :-

CP and CV and Relation for Real Gas
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Difficulty Level:

An ideal gas is taken from the same initial pressure P1 to the same final pressure P2 by three different processes. If it is known that point 1 corresponds to a reversible adiabatic and point 2 corresponds to a single stage adiabatic then

(1) Point 3 may be a two stage adiabatic.

(2) the average K.E. of the gas is maximum at point 1

(3) Work done by surrounding in reaching point number '3' will be maximum

(4) If point4 and point 5 lie along a reversible isotherm then T5 < T1.

Concept Questions :-

Internal Energy and work done
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Difficulty Level:

During winters, moisture condenses in the form of dew and can be seen on plant leaves and grass. The entropy of the system in such cases decreases as liquids possess lesser disorder as compared to gases. With reference to the second law, which statement is correct, for the above process ?

(1) The randomness of the universe decreases

(2) The randomness of the surroundings decreases

(3) Increase is randomness of surroundings equals the decrease in randomness of system

(4) The increase in randomness of the surroundings is greater as compared to the decrease in randomnessof the system.

Concept Questions :-

Spontaneity and Entropy
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Difficulty Level:

For which process will $∆$H° and $∆$G° be expected to be most similar.

(1) 2Al(s) + Al2O3(s) → 2Fe(s) + Al2O3(s)

(2) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

(3) 2NO2(g) → N2O4(g)

(4) 2H2(g) + O2(g) → 2H2O(g)

Concept Questions :-

Spontaneity and Entropy
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Difficulty Level:

A copper block of mass m' at temperature 'T1' is kept in the open atmosphere at temperature T2' where T2 > T1 . The variation of entropy of the copperblock with time is best illustrated by

(1)

(2)

(3)

(4)

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Difficulty Level:

Heat produced in calories by the combustion of one gram of carbon is called

(1) Heat of combustion of carbon

(2) Heat of formation of carbon

(3) Calorific value of carbon

(4) Heat of production of carbon

Concept Questions :-

Thermochemistry
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Difficulty Level:

For the isothermal expansion of an ideal gas

(1) E and H increases

(2) E increases but H decreases

(3) H increases but E decreases

(4) E and H are unaltered

Concept Questions :-

Internal Energy and work done
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Difficulty Level:

If a refrigerator's door is opened, then we get [CPMT 1980]

(1) Room heated

(2) Room cooled

(3) More amount of heat is passed out

(4) No effect on room

Concept Questions :-

Enthalpy and It's Type
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Difficulty Level:

Point out the wrong statement in relation to enthalpy

(1) It is a state function

(2) It is an intensive property

(3) It is independent of the path followed for the change

(4) Its value depends upon the amount of substance in the system

Concept Questions :-

Extensive and Intensive Properties
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Difficulty Level:

Which of the following is zero for an isochoric process

(1) dP

(2) dV

(3) dT

(4) dE

Concept Questions :-

Thermodynamics' Properties and process