An ideal gas expands in volume from 1 × 10–3 m3 to 1 × 10–2 m3 at 300 K against a constant pressure of 1 × 105 Nm–2. The work done is [AIEEE 2004]

(1) 270 kJ

(2) –900 kJ

(3) –900 J

(4) 900 kJ

Concept Questions :-

First Law of Thermodynamics
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The spontaneous flow of heat is always

(1) From low to high pressure

(2) From high to high pressure

(3) Unidirectional from lower temperature to higher temperature

(4) Unidirectional from the higher to lower temperature

Concept Questions :-

Spontaneity and Entropy
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Mixing of non-reacting gases is generally accompanied by

(1) Decrease in entropy

(2) Increase in entropy

(3) Change in enthalpy

(4) Change in free energy

Concept Questions :-

Enthalpy and It's Type
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An irreversible process occuring isothermally in an isolated system leads to

(1) Zero entropy

(2) An increase in the total entropy of the system

(3) A decrease in the total entropy of the system

(4) None of these

Concept Questions :-

Spontaneity and Entropy
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The entropy values (in JK-1 mol-1) of H2(g) = 130.6, Cl2(g) = 223.0 and HCl(g) = 186.7 at 298 K and 1 atm pressure. Then entropy change for the reaction H2(g)+Cl2(g)2HCl(g) is [BHU 2005]

(1) + 540.3

(2) + 727.3

(3) – 166.9

(4) + 19.8

Concept Questions :-

Spontaneity and Entropy
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The ΔS for the vaporisation of 1 mol of water is 88.3 J/mole K. The value of ΔS for the condensation of 1 mol of vapour will be

(1) 88.3 J/mol K

(2) (88.3)2 J/mol K

(3) – 88.3 J/mol K

(4) 188.3 J/mol K

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The occurrence of a reaction is impossible if [AIIMS 1982, 91; MP PET 1997; MP PMT 1999; DPMT 2002]

(1) ΔH is +ve ; ΔS is also + ve but ΔH < TΔS

(2) ΔH is – ve ; ΔS is also – ve but ΔH > TΔS

(3) ΔH is – ve ; ΔS is + ve

(4) ΔH is + ve ; ΔS is – ve

Concept Questions :-

Spontaneity and Entropy
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When enthalpy and entropy change for a chemical reaction are –2.5 × 103 cal and 7.4 cal deg–1 respectively. Predict the reaction at 298 K is [AFMC 1998; MH CET 1999; CBSE PMT 2000]

(1) Spontaneous

(2) Reversible

(3) Irreversible

(4) Non-spontaneous

Concept Questions :-

Gibbs Energy Change
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Which of the following is true for the reaction H2O(l)H2O(g) at 100°C and 1 atmosphere [KCET 1991; AIIMS 1996]

(1) ΔE = 0

(2) ΔH = 0

(3) ΔH = ΔE

(4) ΔH = TΔS

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The enthalpy of vapourization water is 386 kJ. What is the entropy of water [BHU 1997]

(1) 0.5 kJ

(2) 1.03 kJ

(3) 1.5 kJ

(4) 22.05 kJ

Concept Questions :-

Spontaneity and Entropy
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