Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure:

 

ABIsothermal expansion

ACAdiabatic expansion

Which of the following options is not correct?

1. Sisothermal>Sadiabatic

2. TA=TB

3. Wisothermal>Wadiabatic

4. TC>TA

Subtopic:  2nd & 3rd Law of Thermodynamics |
 53%
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NEET - 2019
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An ideal gas expands isothermally from 10-3m3 to 10-2 m3 at 300 K against a constant pressure of 105 Nm-2. The work done by  the gas is:

1. +270 kJ 2. -900 J
3. +900 kJ 4. -900 kJ
Subtopic:  First Law of Thermodynamics |
 70%
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NEET - 2019
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A process among the following shows decrease in entropy is :

1. 2H(g) H2(g)

2. Evaporation of water

3. Expansion of a gas at a constant temperature

4. Sublimation of solid to gas

Subtopic:  Gibbs Energy Change |
 79%
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NEET - 2019
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Under the isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is:
[Given that 1 L bar = 100 J]

1. 30 J

2. -30 J

3. 5 kJ

4. 25 J

Subtopic:  2nd & 3rd Law of Thermodynamics |
 78%
From NCERT
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Hydrolysis of sucrose is given by the following reaction

Sucrose + H2 Glucose + Fructose

If the equilibrium constant (Kc) is 2×1013 at 300 K, the value of rG at the same temperature will be:

1. 8.314 J mol-1 K-1×300 K×ln (2×1013)

2. 8.314 J mol-1 K-1×300 K×ln (3×1013)

3. -8.314 J mol-1 K-1×300 K×ln (4×1013)

4. -8.314 J mol-1 K-1×300 K×ln (2×1013)

Subtopic:  Gibbs Energy Change |
 78%
From NCERT
NEET - 2020
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For the reaction, 2Cl(g)  Cl2(g), the correct option is:

1. rH>0 and rS<0

2. rH<0 and rS>0

3. rH<0 and rS<0

4. rH>0 and rS>0

Subtopic:  Enthalpy & Internal energy | Spontaneity & Entropy |
 60%
From NCERT
NEET - 2020
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The correct option for free expansion of an ideal gas under adiabatic condition is:

1.  q=0, T<0 and w>0

2.  q<0, T=0 and w=0

3.  q>0, T>0 and w>0

4.  q=0, T=0 and w=0

Subtopic:  2nd & 3rd Law of Thermodynamics |
 72%
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If for a certain reaction rH is 30 kJ mol–1 at 450 K, the value of rS (in JK–1 mol–1) for which the same reaction will be spontaneous at the same temperature is:

1. 70

2. –33

3. 33

4. -70

Subtopic:  Spontaneity & Entropy |
 69%
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At standard conditions, if the change in the enthalpy for the following reaction is -109 kJ mol-1
H2(g)+Br2(g) 2HBr(g) and the bond energy of H2 and Br2 is 435 kJ mol-1 and 192 kJ mol-1
respectively, what is the bond energy (in kJ mol-1) of HBr?

1. 368 2. 736
3. 518 4. 259
Subtopic:  Thermochemistry |
 53%
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Which of the following options correctly represents the relationship between \(C_p \text { and } C_V\) for one mole of an ideal gas?

1. \(C_P=R C_V \)
2. \(C_V=RC_P \)
3. \(C_P+C_V=R \)
4. \(C_{\mathrm{P}}-\mathrm{C}_{\mathrm{V}}=\mathrm{R}\)

Subtopic:  Cp & Cv |
 85%
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