Absolute Entropy and Third Law of Thermodynamics
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CHXI06:THERMODYNAMICS

369287 For which of the process, \(\Delta \mathrm{S}\) is negative?

1 \(\mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{H}(\mathrm{g})\)
2 \({{\rm{N}}_{\rm{2}}}{\rm{(g)(1\;atm)}} \to {{\rm{N}}_{\rm{2}}}{\rm{(g)(8\;atm)}}\)
3 \(2 \mathrm{SO}_{3}(\mathrm{~g}) \rightarrow 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})\)
4 \(\mathrm{C}_{\text {(diamond) }} \rightarrow \mathrm{C}_{\text {(graphite) }}\)
CHXI06:THERMODYNAMICS

369288 The entropy change involved in the isothermal reversible expansion of 5 moles of an ideal gas from a volume of \(\mathrm{10 \mathrm{~cm}^{3}}\) to \({\rm{100}}\,{\rm{d}}{{\rm{m}}^{\rm{3}}}\) at \(\mathrm{300 \mathrm{~K}}\) is approximately.

1 \({\rm{95}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
2 \({\rm{19}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
3 \({\rm{9}}{\rm{.5}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
4 \({\rm{41}}{\rm{.5}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
CHXI06:THERMODYNAMICS

369289 Assuming ideal behaviour, what is the entropy of mixing \(\left( {{\rm{\Delta }}{{\rm{S}}_{{\rm{mix }}}}} \right){\rm{of}}\,\,{\rm{1\;mol}}\) of \(\mathrm{\mathrm{N}_{2(\mathrm{~g})}}\) with \(\mathrm{1 \mathrm{~mol}}\) of \(\mathrm{\mathrm{O}_{2(\mathrm{~g})}}\) at the same temperature and pressure ?

1 \(\mathrm{0.693 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
2 \(\mathrm{1.39 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
3 \(\mathrm{5.76 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
4 \(\mathrm{11.5 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
CHXI06:THERMODYNAMICS

369290 Assertion :
Water in liquid state is more stable than ice at room temperature.
Reason :
Water in liquid form has higher entropy than ice.

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 Both Assertion & Reason are false.
AIIMS - 2006
NEET DIGITAL LIBRARY
CHXI06:THERMODYNAMICS

369287 For which of the process, \(\Delta \mathrm{S}\) is negative?

1 \(\mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{H}(\mathrm{g})\)
2 \({{\rm{N}}_{\rm{2}}}{\rm{(g)(1\;atm)}} \to {{\rm{N}}_{\rm{2}}}{\rm{(g)(8\;atm)}}\)
3 \(2 \mathrm{SO}_{3}(\mathrm{~g}) \rightarrow 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})\)
4 \(\mathrm{C}_{\text {(diamond) }} \rightarrow \mathrm{C}_{\text {(graphite) }}\)
CHXI06:THERMODYNAMICS

369288 The entropy change involved in the isothermal reversible expansion of 5 moles of an ideal gas from a volume of \(\mathrm{10 \mathrm{~cm}^{3}}\) to \({\rm{100}}\,{\rm{d}}{{\rm{m}}^{\rm{3}}}\) at \(\mathrm{300 \mathrm{~K}}\) is approximately.

1 \({\rm{95}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
2 \({\rm{19}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
3 \({\rm{9}}{\rm{.5}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
4 \({\rm{41}}{\rm{.5}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
CHXI06:THERMODYNAMICS

369289 Assuming ideal behaviour, what is the entropy of mixing \(\left( {{\rm{\Delta }}{{\rm{S}}_{{\rm{mix }}}}} \right){\rm{of}}\,\,{\rm{1\;mol}}\) of \(\mathrm{\mathrm{N}_{2(\mathrm{~g})}}\) with \(\mathrm{1 \mathrm{~mol}}\) of \(\mathrm{\mathrm{O}_{2(\mathrm{~g})}}\) at the same temperature and pressure ?

1 \(\mathrm{0.693 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
2 \(\mathrm{1.39 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
3 \(\mathrm{5.76 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
4 \(\mathrm{11.5 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
CHXI06:THERMODYNAMICS

369290 Assertion :
Water in liquid state is more stable than ice at room temperature.
Reason :
Water in liquid form has higher entropy than ice.

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 Both Assertion & Reason are false.
AIIMS - 2006
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CHXI06:THERMODYNAMICS

369287 For which of the process, \(\Delta \mathrm{S}\) is negative?

1 \(\mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{H}(\mathrm{g})\)
2 \({{\rm{N}}_{\rm{2}}}{\rm{(g)(1\;atm)}} \to {{\rm{N}}_{\rm{2}}}{\rm{(g)(8\;atm)}}\)
3 \(2 \mathrm{SO}_{3}(\mathrm{~g}) \rightarrow 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})\)
4 \(\mathrm{C}_{\text {(diamond) }} \rightarrow \mathrm{C}_{\text {(graphite) }}\)
CHXI06:THERMODYNAMICS

369288 The entropy change involved in the isothermal reversible expansion of 5 moles of an ideal gas from a volume of \(\mathrm{10 \mathrm{~cm}^{3}}\) to \({\rm{100}}\,{\rm{d}}{{\rm{m}}^{\rm{3}}}\) at \(\mathrm{300 \mathrm{~K}}\) is approximately.

1 \({\rm{95}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
2 \({\rm{19}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
3 \({\rm{9}}{\rm{.5}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
4 \({\rm{41}}{\rm{.5}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
CHXI06:THERMODYNAMICS

369289 Assuming ideal behaviour, what is the entropy of mixing \(\left( {{\rm{\Delta }}{{\rm{S}}_{{\rm{mix }}}}} \right){\rm{of}}\,\,{\rm{1\;mol}}\) of \(\mathrm{\mathrm{N}_{2(\mathrm{~g})}}\) with \(\mathrm{1 \mathrm{~mol}}\) of \(\mathrm{\mathrm{O}_{2(\mathrm{~g})}}\) at the same temperature and pressure ?

1 \(\mathrm{0.693 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
2 \(\mathrm{1.39 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
3 \(\mathrm{5.76 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
4 \(\mathrm{11.5 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
CHXI06:THERMODYNAMICS

369290 Assertion :
Water in liquid state is more stable than ice at room temperature.
Reason :
Water in liquid form has higher entropy than ice.

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 Both Assertion & Reason are false.
AIIMS - 2006
For More Updates join with Us
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CHXI06:THERMODYNAMICS

369287 For which of the process, \(\Delta \mathrm{S}\) is negative?

1 \(\mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{H}(\mathrm{g})\)
2 \({{\rm{N}}_{\rm{2}}}{\rm{(g)(1\;atm)}} \to {{\rm{N}}_{\rm{2}}}{\rm{(g)(8\;atm)}}\)
3 \(2 \mathrm{SO}_{3}(\mathrm{~g}) \rightarrow 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})\)
4 \(\mathrm{C}_{\text {(diamond) }} \rightarrow \mathrm{C}_{\text {(graphite) }}\)
CHXI06:THERMODYNAMICS

369288 The entropy change involved in the isothermal reversible expansion of 5 moles of an ideal gas from a volume of \(\mathrm{10 \mathrm{~cm}^{3}}\) to \({\rm{100}}\,{\rm{d}}{{\rm{m}}^{\rm{3}}}\) at \(\mathrm{300 \mathrm{~K}}\) is approximately.

1 \({\rm{95}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
2 \({\rm{19}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
3 \({\rm{9}}{\rm{.5}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
4 \({\rm{41}}{\rm{.5}}\,{\rm{J}}\,{{\rm{K}}^{{\rm{ - 1}}}}\)
CHXI06:THERMODYNAMICS

369289 Assuming ideal behaviour, what is the entropy of mixing \(\left( {{\rm{\Delta }}{{\rm{S}}_{{\rm{mix }}}}} \right){\rm{of}}\,\,{\rm{1\;mol}}\) of \(\mathrm{\mathrm{N}_{2(\mathrm{~g})}}\) with \(\mathrm{1 \mathrm{~mol}}\) of \(\mathrm{\mathrm{O}_{2(\mathrm{~g})}}\) at the same temperature and pressure ?

1 \(\mathrm{0.693 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
2 \(\mathrm{1.39 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
3 \(\mathrm{5.76 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
4 \(\mathrm{11.5 \mathrm{~J} /(\mathrm{K} \mathrm{mol})}\)
CHXI06:THERMODYNAMICS

369290 Assertion :
Water in liquid state is more stable than ice at room temperature.
Reason :
Water in liquid form has higher entropy than ice.

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 Both Assertion & Reason are false.
AIIMS - 2006
NEET DIGITAL LIBRARY