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

Subtopic:  Spontaneity & Entropy |
 79%
From NCERT
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The 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

Subtopic:  Enthalpy & Internal energy |
 70%
From NCERT
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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

Subtopic:  Spontaneity & Entropy |
 59%
From NCERT
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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

(1) + 540.3

(2) + 727.3

(3) – 166.9

(4) + 19.8

Subtopic:  Spontaneity & Entropy |
 77%
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The ΔS for the vaporization 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        

Subtopic:  Spontaneity & Entropy |
 78%
From NCERT
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The occurrence of a reaction is impossible if -

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

Subtopic:  Spontaneity & Entropy |
 69%
From NCERT
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The 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

1. Spontaneous

2. Reversible

3. Irreversible

4. Non-spontaneous

Subtopic:  Gibbs Energy Change |
 84%
From NCERT
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Which of the following is true for the reaction H2O(l)H2O(g) at 100°C and 1 atmosphere

1. ΔE = 0

2. ΔH = 0

3. ΔH = ΔE

4. ΔH = TΔS

Subtopic:  Gibbs Energy Change |
 68%
From NCERT
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The enthalpy of vapourization water is 386 kJ. What is the entropy of water

(1) 0.5 kJ

(2) 1.03 kJ

(3) 1.5 kJ

(4) 22.05 kJ

Subtopic:  Spontaneity & Entropy |
 78%
From NCERT
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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 temperature, the entropy of a perfectly crystalline substance is +ve

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

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

Subtopic:  Spontaneity & Entropy |
 62%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh