In an adiabatic expansion the product of pressure and volume-

1. decreases

2. increases

3. remains constant

4. first increase then decreases

Subtopic:  First Law of Thermodynamics |
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NEET 2023 - Target Batch - Aryan Raj Singh
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The molar entropy of the vapourization of acetic acid is\(14.4~ \mathrm{cal}~ \mathrm{K}^{-1} \mathrm{~mol}^{-1}\) at its boiling point 118C. The latent heat of vapourization of acetic acid is-

1. \(49 ~\mathrm{cal}~ \mathrm{g}^{-1} \) 2. \(64 ~\mathrm{cal}~ \mathrm{g}^{-1} \)
3. \(94 ~\mathrm{cal}~ \mathrm{g}^{-1} \) 4. \(84 ~\mathrm{cal}~ \mathrm{g}^{-1} \)
Subtopic:  Spontaneity & Entropy |
 59%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

100 ml of 0.3 M HCl solution is mixed with 100 ml of 0.35 M NaOH solution. The amount of heat liberated is

1. 7.3 kJ

2. 5.71 kJ

3. 10.42 kJ

4. 1.713 kJ

Subtopic:  Enthalpy & Internal energy |
 54%
From NCERT
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The quantity δq i.e. heat absorbed an infinitesimal process is

1. Dependent on the path of transformation

2. Dependent on the thermodynamic state of the system

3. Independent of both

4. An exact differential

Subtopic:  Classification of System, Extensive & Intensive Properties |
 60%
From NCERT
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An ideal gas absorbs 2000 cal of heat from a heat reservoir and does mechanical work equivalent to 4200 J. The change in internal energy of the gas is-

1. 3000 cal

2. 2000 cal

3. 1500 cal

4. 1000 cal

Subtopic:  Enthalpy & Internal energy |
 62%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

For an ideal gas four processes are marked as 1, 2, 3 and 4 on P-V diagram as shown in figure. The amount of heat supplied to the gas in the process 1, 2, 3 and 4 are Q1, Q2, Q3 and Q4 repectively, then correct order of heat supplied to the gas is

[AB is process-1, AC is process-2, AD is adiabatic process-3 and AE is process-4]

1. Q1>Q2>Q3>Q4

2. Q1>Q2>Q4>Q3

3.  Q1>Q4>Q2>Q4

4. Q1<Q2<Q3<Q4

Subtopic:  First Law of Thermodynamics |
From NCERT
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The latent heat of vapourisation of water at 25C is 10.5 kcal mol-1 and the standard heat of formation of liquid water is -68.3 kcal. The enthalpy change of the reaction

H2g+1/2O2gH2Og is therefore,

1. -57.8 kcal

2. -78.8 kcal

3. 78.8 kcal

4. -47.3 kcal

Subtopic:  Enthalpy & Internal energy |
 60%
From NCERT
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Which of the following thermodynamic quantities is an outcome of the second law of thermodynamics?

1. Work

2. Enthalpy

3. Internal energy

4. Entropy

Subtopic:  Spontaneity & Entropy |
 76%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

From the following data of H, of the following reactions,

Cs+12O2COg    ;H=-110 kJ
Cs+H2OCOg+H2g  ;H=132 kJ

What is the mole composition of the mixture of steam and oxygen on being passed over coke at 1273 K, keeping temperature constant.

1. 0.5 : 1

2. 0.6 : 1

3. 0.8 : 1

4. 1 : 1

Subtopic:  Enthalpy & Internal energy |
 51%
From NCERT
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State which of the following statements is true ?

1. First law of thermodynamics is not adequate in predicting the direction of the process.

2. In an exothermic reaction, the total enthalpy of the products is greater than that of reactants.

3. The standard enthalpy of diamond is zero at 298 K and 1 atm pressure.

4. It is possible to calculate the value of H for the reaction H2g+Br2l2HBrg from the bond enthalpy data.

Subtopic:  First Law of Thermodynamics |
 51%
From NCERT
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