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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Difficulty Level:

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 ${\mathrm{H}}_{2\left(\mathrm{g}\right)}+{\mathrm{Cl}}_{2\left(\mathrm{g}\right)}\to 2{\mathrm{HCl}}_{\left(\mathrm{g}\right)}$ is [BHU 2005]

(1) + 540.3

(2) + 727.3

(3) – 166.9

(4) + 19.8

Concept Questions :-

Spontaneity and Entropy
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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) $\frac{1}{88.3}$ J/mol K

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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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Difficulty Level:

Which of the following is true for the reaction ${H}_{2}O\left(l\right)\underset{}{\overset{}{⇌}}{H}_{2}O\left(g\right)$ 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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Difficulty Level:

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
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Identify the correct statement regarding entropy [CBSE PMT 1998; BHU 2001]

(1) At 0°C, the entropy of a perfectly crystalline substance is taken to be zero

(2) At absolute zero of temperature, the entropy of a perfectly crystalline substance is +ve

(3) At absolute zero of temperature, the entropy of all crystalline substances is taken to be zero

(4) At absolute zero of temperature, the entropy of a perfectly crystalline substance is taken to be zero

Concept Questions :-

Spontaneity and Entropy
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

An engine operating between 150°C and 25°C takes 500 J heat from a higher temperature reservoir if there are no frictional losses, then work done by engine is [MH CET 1999]

(1) 147.7 J

(2) 157.75 J

(3) 165.85 J

(4) 169.95 J

Concept Questions :-

First Law of Thermodynamics
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The standard entropies of CO2(g), C(s) and O2(g) are 213.5, 5.690 and 205 JK–1 respectively. The standard entropy of formation of CO2(g) is [CPMT 2001]

(1) 1.86 JK–1

(2) 1.96 JK–1

(3) 2.81 JK–1

(4) 2.86 JK–1

Concept Questions :-

Thermochemistry