The relation between ΔE and ΔH is [MP PET 1992; MP PMT 1996; MP PET/PMT 1998]

1. ΔH=ΔEPΔV

2. ΔH=ΔE+PΔV

3. ΔE=ΔV+ΔH

4. ΔE=ΔH+PΔV

Subtopic:  Enthalpy & Internal energy |
 80%
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At constant T and P, which one of the following statements is correct for the reaction, CO(g)+12O2(g)CO2(g)

(1) ΔH is independent of the physical state of the reactants of that compound

(2) ΔH > ΔE

(3) ΔH < ΔE

(4) ΔH = ΔE

Subtopic:  2nd & 3rd Law of Thermodynamics |
 72%
From NCERT
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For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, ΔU and w correspond to

(1) ΔU<0, w=0

(2) ΔU=0,w<0

(3) ΔU>0,w=0

(4) ΔU<0,w>0

Subtopic:  2nd & 3rd Law of Thermodynamics |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

If ΔH is the change in enthalpy and ΔE the change in internal energy accompanying a gaseous reaction

(1) ΔH is always greater than ΔE

(2) ΔH < ΔE only if the number of moles of the products is greater than the number of the reactants

(3) ΔH is always less than ΔE

(4) ΔH < ΔE only if the number of moles of the products is less than the number of moles of the reactants

Subtopic:  First Law of Thermodynamics |
 76%
From NCERT
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Enthalpy for the reaction C + O2 → CO2 is-

1. Positive

2. Negative

3. Zero

4. None

Subtopic:  Enthalpy & Internal energy |
 73%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 liters to 20 liters at 25°C is -

1. -2.303×298×0.082 log 2

2. -298×107×8.31×2.303 log 2

3. 2.303×298×0.082 log 0.5

4. -8.31×107×2982.303 log 0.5

Subtopic:  First Law of Thermodynamics |
 66%
From NCERT
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Links
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NEET 2023 - Target Batch - Aryan Raj Singh

In a reversible isothermal process, the change in internal energy is-

1. Zero

2. Positive

3. Negative

4. None of the above

Subtopic:  Thermodynamics' Properties and process |
 81%
From NCERT
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The enthalpy of neutralization of which of the following acids and bases is nearly –13.6 Kcal [Roorkee 1999]

(1) HCN and NaOH

(2) HCl and KOH

(3) HCl and HCN

(4) HCl and NH4OH

Subtopic:  Hess's Law |
 70%
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What is the work done when one mole of an ideal gas undergoes isothermal expansion from an initial pressure of 10 atm to a final pressure of 1 atm at a constant temperature of 300 K? (Gas constant = 2 calorie )
1. 938.8 cal
2. 1138.8 cal
3. 1381.8 cal
4. 1581.8 cal

Subtopic:  First Law of Thermodynamics |
 79%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Joule-Thomson expansion is [JIPMER 2000]

(1) Isobaric

(2) Isoenthalpic

(3) Isothermal

(4) None of these

Subtopic:  Thermodynamics' Properties and process |
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NEET 2023 - Target Batch - Aryan Raj Singh
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