Consider the following diagram for a reaction AC:

The nature of the reaction is-

1. Exothermic 2. Endothermic
3. Reaction at equilibrium 4. None of the above

Subtopic:  Enthalpy & Internal energy |
 82%
From NCERT
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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%
From NCERT
NEET - 2021
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For irreversible expansion of an ideal gas under isothermal condition, the correct option is :

1. U=0, Stotal0

2. U0, Stotal=0

3. U=0, Stotal=0

4. U0, Stotal0

Subtopic:  Spontaneity & Entropy |
 64%
From NCERT
NEET - 2021
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Two litres of 1 mol an ideal gas at a pressure of 10 atm expands isothermally at 25 °C into a vacuum until its total volume is 10 litres. The amount of heat absorbed during expansion is:
(Given: log 5 = 0.699)

1. 51. 39 atm L

2. 39.36 atm L

3. 37. 34 atm ml

4. 26. 49 atm L

Subtopic:  First Law of Thermodynamics |
 59%
From NCERT
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Assuming the water vapour to be a perfect gas. When 1 mol of water at 100°C and 1 bar pressure is converted to ice at 0°C, the change in internal energy is-

(The enthalpy of fusion of ice = 6.00 kJ mol-1 , heat capacity of water = 4.2 J/g°C)

1. 13.56 kJ mol-1

2. -12.16 kJ mol-1

3. -13.56 kJ mol-1

4. 12.16 kJ mol-1

Subtopic:  Thermochemistry |
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Consider the following diagram for a reaction AC


      

The nature of the reaction is-

1. Exothermic

2. Endothermic

3. Reaction at equilibrium

4. None of the above

Subtopic:  Enthalpy & Internal energy |
 81%
From NCERT
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Consider the following graph.

  

The work done shown by the above-mentioned graph is-

1. Positive 2. Negative
3. Zero 4. Cannot be determined
Subtopic:  First Law of Thermodynamics |
 70%
From NCERT
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For the graph given below, it can be concluded that work done during the process shown will be-

1. Zero 2. Negative
3. Positive 4. Cannot be determined
Subtopic:  First Law of Thermodynamics |
 65%
From NCERT
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The entropy change in the surroundings when 1.00 mol of H2O(l) is formed under standard conditions is-

fHθ = –286 kJ mol–1 

1. 952.5 J mol-1

2. 979.7 J mol-1

3. 949.7 J mol-1

4. 959.7 J mol-1

Subtopic:  Spontaneity & Entropy |
 51%
From NCERT
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12N2 (g) + 12O2 (g)  NO(g) ;
rH° = 90 kJ mol-1
NO(g) + 12O2(g)  NO2(g); 
rH° = -74 kJ mol-1

The thermodynamic stability of NO(g) based on the above data is:

1. Less than NO2(g) 

2. More than NO2(g)

3. Equal to NO2(g)

4. Insufficient data

Subtopic:  Enthalpy & Internal energy |
 71%
From NCERT
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