First Law of Thermodynamics
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CHXI06:THERMODYNAMICS

369347 What is the amount of work done when 0.5 mole of methane, \(\mathrm{\mathrm{CH}_{4}(\mathrm{~g})}\), is subjected to combustion at \(\mathrm{300 \mathrm{~K}}\) ? (Given, \(\mathrm{\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}}\) )

1 \(\mathrm{-2494 \mathrm{~J}}\)
2 \(\mathrm{-4988 \mathrm{~J}}\)
3 \(\mathrm{+4988 \mathrm{~J}}\)
4 \(\mathrm{+2494 \mathrm{~J}}\)
CHXI06:THERMODYNAMICS

369348 In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following

1 \(\mathrm{q}=0, \Delta \mathrm{T} \neq 0\)
2 \(\mathrm{q} \neq 0, \Delta \mathrm{T}=0\)
3 \(\mathrm{q}=0, \Delta \mathrm{T}=0\)
4 \(\mathrm{q}=0, \Delta \mathrm{T} < 0\)
AIIMS - 2018
CHXI06:THERMODYNAMICS

369349 Assertion :
When a gas at high pressure expands against vacuum, the work done is maximum.
Reason :
Work done in expansion depends upon the pressure of gas inside the vessel and increase in volume.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXI06:THERMODYNAMICS

369350 Two moles of an ideal gas are expanded isothermally from \(15 \mathrm{dm}^{3}\) to \(20 \mathrm{dm}^{3}\). If the amount of work done is \(-6 \mathrm{dm}^{3}\) bar, find external pressure needed to obtain this work.

1 \(1.2 \times 10^{5} \mathrm{~Pa}\)
2 \(3.2 \mathrm{~Pa}\)
3 \(8.1 \times 10^{4} \mathrm{~Pa}\)
4 \(2.4 \mathrm{~Pa}\)
MHTCET - 2021
CHXI06:THERMODYNAMICS

369351 Which of the following reactions shows work of compression?

1 \(\mathrm{NH}_{3(\mathrm{~g})}+\mathrm{HCl}_{(\mathrm{g})} \rightarrow \mathrm{NH}_{4} \mathrm{Cl}_{(\mathrm{s})}\)
2 \(\mathrm{C}_{2} \mathrm{H}_{6(\mathrm{~g})} \rightarrow 2 \mathrm{C}_{(\mathrm{s})}+3 \mathrm{H}_{2(\mathrm{~g})}\)
3 \(2 \mathrm{SO}_{3(\mathrm{~g})} \rightarrow 2 \mathrm{SO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}\)
4 \(2 \mathrm{H}_{2} \mathrm{O}_{2(\ell)} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}_{(\ell)}+\mathrm{O}_{2(\mathrm{~g})}\)
MHTCET - 2021
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CHXI06:THERMODYNAMICS

369347 What is the amount of work done when 0.5 mole of methane, \(\mathrm{\mathrm{CH}_{4}(\mathrm{~g})}\), is subjected to combustion at \(\mathrm{300 \mathrm{~K}}\) ? (Given, \(\mathrm{\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}}\) )

1 \(\mathrm{-2494 \mathrm{~J}}\)
2 \(\mathrm{-4988 \mathrm{~J}}\)
3 \(\mathrm{+4988 \mathrm{~J}}\)
4 \(\mathrm{+2494 \mathrm{~J}}\)
CHXI06:THERMODYNAMICS

369348 In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following

1 \(\mathrm{q}=0, \Delta \mathrm{T} \neq 0\)
2 \(\mathrm{q} \neq 0, \Delta \mathrm{T}=0\)
3 \(\mathrm{q}=0, \Delta \mathrm{T}=0\)
4 \(\mathrm{q}=0, \Delta \mathrm{T} < 0\)
AIIMS - 2018
CHXI06:THERMODYNAMICS

369349 Assertion :
When a gas at high pressure expands against vacuum, the work done is maximum.
Reason :
Work done in expansion depends upon the pressure of gas inside the vessel and increase in volume.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXI06:THERMODYNAMICS

369350 Two moles of an ideal gas are expanded isothermally from \(15 \mathrm{dm}^{3}\) to \(20 \mathrm{dm}^{3}\). If the amount of work done is \(-6 \mathrm{dm}^{3}\) bar, find external pressure needed to obtain this work.

1 \(1.2 \times 10^{5} \mathrm{~Pa}\)
2 \(3.2 \mathrm{~Pa}\)
3 \(8.1 \times 10^{4} \mathrm{~Pa}\)
4 \(2.4 \mathrm{~Pa}\)
MHTCET - 2021
CHXI06:THERMODYNAMICS

369351 Which of the following reactions shows work of compression?

1 \(\mathrm{NH}_{3(\mathrm{~g})}+\mathrm{HCl}_{(\mathrm{g})} \rightarrow \mathrm{NH}_{4} \mathrm{Cl}_{(\mathrm{s})}\)
2 \(\mathrm{C}_{2} \mathrm{H}_{6(\mathrm{~g})} \rightarrow 2 \mathrm{C}_{(\mathrm{s})}+3 \mathrm{H}_{2(\mathrm{~g})}\)
3 \(2 \mathrm{SO}_{3(\mathrm{~g})} \rightarrow 2 \mathrm{SO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}\)
4 \(2 \mathrm{H}_{2} \mathrm{O}_{2(\ell)} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}_{(\ell)}+\mathrm{O}_{2(\mathrm{~g})}\)
MHTCET - 2021
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CHXI06:THERMODYNAMICS

369347 What is the amount of work done when 0.5 mole of methane, \(\mathrm{\mathrm{CH}_{4}(\mathrm{~g})}\), is subjected to combustion at \(\mathrm{300 \mathrm{~K}}\) ? (Given, \(\mathrm{\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}}\) )

1 \(\mathrm{-2494 \mathrm{~J}}\)
2 \(\mathrm{-4988 \mathrm{~J}}\)
3 \(\mathrm{+4988 \mathrm{~J}}\)
4 \(\mathrm{+2494 \mathrm{~J}}\)
CHXI06:THERMODYNAMICS

369348 In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following

1 \(\mathrm{q}=0, \Delta \mathrm{T} \neq 0\)
2 \(\mathrm{q} \neq 0, \Delta \mathrm{T}=0\)
3 \(\mathrm{q}=0, \Delta \mathrm{T}=0\)
4 \(\mathrm{q}=0, \Delta \mathrm{T} < 0\)
AIIMS - 2018
CHXI06:THERMODYNAMICS

369349 Assertion :
When a gas at high pressure expands against vacuum, the work done is maximum.
Reason :
Work done in expansion depends upon the pressure of gas inside the vessel and increase in volume.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXI06:THERMODYNAMICS

369350 Two moles of an ideal gas are expanded isothermally from \(15 \mathrm{dm}^{3}\) to \(20 \mathrm{dm}^{3}\). If the amount of work done is \(-6 \mathrm{dm}^{3}\) bar, find external pressure needed to obtain this work.

1 \(1.2 \times 10^{5} \mathrm{~Pa}\)
2 \(3.2 \mathrm{~Pa}\)
3 \(8.1 \times 10^{4} \mathrm{~Pa}\)
4 \(2.4 \mathrm{~Pa}\)
MHTCET - 2021
CHXI06:THERMODYNAMICS

369351 Which of the following reactions shows work of compression?

1 \(\mathrm{NH}_{3(\mathrm{~g})}+\mathrm{HCl}_{(\mathrm{g})} \rightarrow \mathrm{NH}_{4} \mathrm{Cl}_{(\mathrm{s})}\)
2 \(\mathrm{C}_{2} \mathrm{H}_{6(\mathrm{~g})} \rightarrow 2 \mathrm{C}_{(\mathrm{s})}+3 \mathrm{H}_{2(\mathrm{~g})}\)
3 \(2 \mathrm{SO}_{3(\mathrm{~g})} \rightarrow 2 \mathrm{SO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}\)
4 \(2 \mathrm{H}_{2} \mathrm{O}_{2(\ell)} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}_{(\ell)}+\mathrm{O}_{2(\mathrm{~g})}\)
MHTCET - 2021
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CHXI06:THERMODYNAMICS

369347 What is the amount of work done when 0.5 mole of methane, \(\mathrm{\mathrm{CH}_{4}(\mathrm{~g})}\), is subjected to combustion at \(\mathrm{300 \mathrm{~K}}\) ? (Given, \(\mathrm{\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}}\) )

1 \(\mathrm{-2494 \mathrm{~J}}\)
2 \(\mathrm{-4988 \mathrm{~J}}\)
3 \(\mathrm{+4988 \mathrm{~J}}\)
4 \(\mathrm{+2494 \mathrm{~J}}\)
CHXI06:THERMODYNAMICS

369348 In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following

1 \(\mathrm{q}=0, \Delta \mathrm{T} \neq 0\)
2 \(\mathrm{q} \neq 0, \Delta \mathrm{T}=0\)
3 \(\mathrm{q}=0, \Delta \mathrm{T}=0\)
4 \(\mathrm{q}=0, \Delta \mathrm{T} < 0\)
AIIMS - 2018
CHXI06:THERMODYNAMICS

369349 Assertion :
When a gas at high pressure expands against vacuum, the work done is maximum.
Reason :
Work done in expansion depends upon the pressure of gas inside the vessel and increase in volume.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXI06:THERMODYNAMICS

369350 Two moles of an ideal gas are expanded isothermally from \(15 \mathrm{dm}^{3}\) to \(20 \mathrm{dm}^{3}\). If the amount of work done is \(-6 \mathrm{dm}^{3}\) bar, find external pressure needed to obtain this work.

1 \(1.2 \times 10^{5} \mathrm{~Pa}\)
2 \(3.2 \mathrm{~Pa}\)
3 \(8.1 \times 10^{4} \mathrm{~Pa}\)
4 \(2.4 \mathrm{~Pa}\)
MHTCET - 2021
CHXI06:THERMODYNAMICS

369351 Which of the following reactions shows work of compression?

1 \(\mathrm{NH}_{3(\mathrm{~g})}+\mathrm{HCl}_{(\mathrm{g})} \rightarrow \mathrm{NH}_{4} \mathrm{Cl}_{(\mathrm{s})}\)
2 \(\mathrm{C}_{2} \mathrm{H}_{6(\mathrm{~g})} \rightarrow 2 \mathrm{C}_{(\mathrm{s})}+3 \mathrm{H}_{2(\mathrm{~g})}\)
3 \(2 \mathrm{SO}_{3(\mathrm{~g})} \rightarrow 2 \mathrm{SO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}\)
4 \(2 \mathrm{H}_{2} \mathrm{O}_{2(\ell)} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}_{(\ell)}+\mathrm{O}_{2(\mathrm{~g})}\)
MHTCET - 2021
Join With Us for More Updates
CHXI06:THERMODYNAMICS

369347 What is the amount of work done when 0.5 mole of methane, \(\mathrm{\mathrm{CH}_{4}(\mathrm{~g})}\), is subjected to combustion at \(\mathrm{300 \mathrm{~K}}\) ? (Given, \(\mathrm{\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}}\) )

1 \(\mathrm{-2494 \mathrm{~J}}\)
2 \(\mathrm{-4988 \mathrm{~J}}\)
3 \(\mathrm{+4988 \mathrm{~J}}\)
4 \(\mathrm{+2494 \mathrm{~J}}\)
CHXI06:THERMODYNAMICS

369348 In an adiabatic process, no transfer of heat takes place between system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following

1 \(\mathrm{q}=0, \Delta \mathrm{T} \neq 0\)
2 \(\mathrm{q} \neq 0, \Delta \mathrm{T}=0\)
3 \(\mathrm{q}=0, \Delta \mathrm{T}=0\)
4 \(\mathrm{q}=0, \Delta \mathrm{T} < 0\)
AIIMS - 2018
CHXI06:THERMODYNAMICS

369349 Assertion :
When a gas at high pressure expands against vacuum, the work done is maximum.
Reason :
Work done in expansion depends upon the pressure of gas inside the vessel and increase in volume.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXI06:THERMODYNAMICS

369350 Two moles of an ideal gas are expanded isothermally from \(15 \mathrm{dm}^{3}\) to \(20 \mathrm{dm}^{3}\). If the amount of work done is \(-6 \mathrm{dm}^{3}\) bar, find external pressure needed to obtain this work.

1 \(1.2 \times 10^{5} \mathrm{~Pa}\)
2 \(3.2 \mathrm{~Pa}\)
3 \(8.1 \times 10^{4} \mathrm{~Pa}\)
4 \(2.4 \mathrm{~Pa}\)
MHTCET - 2021
CHXI06:THERMODYNAMICS

369351 Which of the following reactions shows work of compression?

1 \(\mathrm{NH}_{3(\mathrm{~g})}+\mathrm{HCl}_{(\mathrm{g})} \rightarrow \mathrm{NH}_{4} \mathrm{Cl}_{(\mathrm{s})}\)
2 \(\mathrm{C}_{2} \mathrm{H}_{6(\mathrm{~g})} \rightarrow 2 \mathrm{C}_{(\mathrm{s})}+3 \mathrm{H}_{2(\mathrm{~g})}\)
3 \(2 \mathrm{SO}_{3(\mathrm{~g})} \rightarrow 2 \mathrm{SO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}\)
4 \(2 \mathrm{H}_{2} \mathrm{O}_{2(\ell)} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}_{(\ell)}+\mathrm{O}_{2(\mathrm{~g})}\)
MHTCET - 2021