Absolute Entropy and Third Law of Thermodynamics
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CHXI06:THERMODYNAMICS

369257 \({\rm{\Delta S}}\) will be highest for

1 \({\rm{C}}{{\rm{a}}_{{\rm{(s)}}}} + {\rm{1/2}}{{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{Ca}}{{\rm{O}}_{{\rm{(s)}}}}\)
2 \({\rm{CaC}}{{\rm{O}}_{{\rm{3(s)}}}} \to {\rm{Ca}}{{\rm{O}}_{{\rm{(s)}}}} + {\rm{C}}{{\rm{O}}_{{\rm{2(\;g)}}}}\)
3 \({{\rm{C}}_{{\rm{(s)}}}} + {{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{C}}{{\rm{O}}_{{\rm{2(g)}}}}\)
4 \({{\rm{N}}_{{\rm{2(g)}}}} + {{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{2N}}{{\rm{O}}_{{\rm{(g)}}}}\)
CHXI06:THERMODYNAMICS

369258 An ideal gas undergoes isothermal expansion at constant pressure. During the process:

1 Enthalpy increases but entropy decreases.
2 Enthalpy remains constant but entropy increases.
3 Enthalpy decreases but entropy increases.
4 Both enthalpy and entropy remain constant.
JEE - 2017
CHXI06:THERMODYNAMICS

369259 A container has hydrogen and oxygen mixture in the ratio of \(4: 1\) by weight then

1 Internal energy of the mixture decreases
2 Internal energy of the mixture increases
3 Entropy of the mixture increases
4 Entropy of the mixture decreases
CHXI06:THERMODYNAMICS

369260 Amongst the following, the total number of reactions processes in which the entropy increases are:
a.
\[\begin{array}{l}
{\rm{2NaHC}}{{\rm{O}}_{\rm{3}}}(\;{\rm{s}}) \to {\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{C}}{{\rm{O}}_{\rm{3}}}(\;{\rm{s}}){\rm{ + C}}{{\rm{O}}_{\rm{2}}}(\;{\rm{g}})\\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}}({\rm{g}})
\end{array}\]
b. A liquid cyrstallises into a solid.
c. Temperature of cystalline solid is raised from zero K to 100 K .
d. Hard boiling of an egg.
e. Devitrification of glass.
f. Stretching of a rubber band.
g. Desalination of water.
h. \({\mathrm{\mathrm{NH}_{3}(\mathrm{~g}, 10 \mathrm{~atm}) \longrightarrow \mathrm{NH}_{3}(\mathrm{~g}, 1}}\) atom \({\mathrm{)}}\)

1 6
2 2
3 3
4 4
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CHXI06:THERMODYNAMICS

369257 \({\rm{\Delta S}}\) will be highest for

1 \({\rm{C}}{{\rm{a}}_{{\rm{(s)}}}} + {\rm{1/2}}{{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{Ca}}{{\rm{O}}_{{\rm{(s)}}}}\)
2 \({\rm{CaC}}{{\rm{O}}_{{\rm{3(s)}}}} \to {\rm{Ca}}{{\rm{O}}_{{\rm{(s)}}}} + {\rm{C}}{{\rm{O}}_{{\rm{2(\;g)}}}}\)
3 \({{\rm{C}}_{{\rm{(s)}}}} + {{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{C}}{{\rm{O}}_{{\rm{2(g)}}}}\)
4 \({{\rm{N}}_{{\rm{2(g)}}}} + {{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{2N}}{{\rm{O}}_{{\rm{(g)}}}}\)
CHXI06:THERMODYNAMICS

369258 An ideal gas undergoes isothermal expansion at constant pressure. During the process:

1 Enthalpy increases but entropy decreases.
2 Enthalpy remains constant but entropy increases.
3 Enthalpy decreases but entropy increases.
4 Both enthalpy and entropy remain constant.
JEE - 2017
CHXI06:THERMODYNAMICS

369259 A container has hydrogen and oxygen mixture in the ratio of \(4: 1\) by weight then

1 Internal energy of the mixture decreases
2 Internal energy of the mixture increases
3 Entropy of the mixture increases
4 Entropy of the mixture decreases
CHXI06:THERMODYNAMICS

369260 Amongst the following, the total number of reactions processes in which the entropy increases are:
a.
\[\begin{array}{l}
{\rm{2NaHC}}{{\rm{O}}_{\rm{3}}}(\;{\rm{s}}) \to {\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{C}}{{\rm{O}}_{\rm{3}}}(\;{\rm{s}}){\rm{ + C}}{{\rm{O}}_{\rm{2}}}(\;{\rm{g}})\\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}}({\rm{g}})
\end{array}\]
b. A liquid cyrstallises into a solid.
c. Temperature of cystalline solid is raised from zero K to 100 K .
d. Hard boiling of an egg.
e. Devitrification of glass.
f. Stretching of a rubber band.
g. Desalination of water.
h. \({\mathrm{\mathrm{NH}_{3}(\mathrm{~g}, 10 \mathrm{~atm}) \longrightarrow \mathrm{NH}_{3}(\mathrm{~g}, 1}}\) atom \({\mathrm{)}}\)

1 6
2 2
3 3
4 4
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CHXI06:THERMODYNAMICS

369257 \({\rm{\Delta S}}\) will be highest for

1 \({\rm{C}}{{\rm{a}}_{{\rm{(s)}}}} + {\rm{1/2}}{{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{Ca}}{{\rm{O}}_{{\rm{(s)}}}}\)
2 \({\rm{CaC}}{{\rm{O}}_{{\rm{3(s)}}}} \to {\rm{Ca}}{{\rm{O}}_{{\rm{(s)}}}} + {\rm{C}}{{\rm{O}}_{{\rm{2(\;g)}}}}\)
3 \({{\rm{C}}_{{\rm{(s)}}}} + {{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{C}}{{\rm{O}}_{{\rm{2(g)}}}}\)
4 \({{\rm{N}}_{{\rm{2(g)}}}} + {{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{2N}}{{\rm{O}}_{{\rm{(g)}}}}\)
CHXI06:THERMODYNAMICS

369258 An ideal gas undergoes isothermal expansion at constant pressure. During the process:

1 Enthalpy increases but entropy decreases.
2 Enthalpy remains constant but entropy increases.
3 Enthalpy decreases but entropy increases.
4 Both enthalpy and entropy remain constant.
JEE - 2017
CHXI06:THERMODYNAMICS

369259 A container has hydrogen and oxygen mixture in the ratio of \(4: 1\) by weight then

1 Internal energy of the mixture decreases
2 Internal energy of the mixture increases
3 Entropy of the mixture increases
4 Entropy of the mixture decreases
CHXI06:THERMODYNAMICS

369260 Amongst the following, the total number of reactions processes in which the entropy increases are:
a.
\[\begin{array}{l}
{\rm{2NaHC}}{{\rm{O}}_{\rm{3}}}(\;{\rm{s}}) \to {\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{C}}{{\rm{O}}_{\rm{3}}}(\;{\rm{s}}){\rm{ + C}}{{\rm{O}}_{\rm{2}}}(\;{\rm{g}})\\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}}({\rm{g}})
\end{array}\]
b. A liquid cyrstallises into a solid.
c. Temperature of cystalline solid is raised from zero K to 100 K .
d. Hard boiling of an egg.
e. Devitrification of glass.
f. Stretching of a rubber band.
g. Desalination of water.
h. \({\mathrm{\mathrm{NH}_{3}(\mathrm{~g}, 10 \mathrm{~atm}) \longrightarrow \mathrm{NH}_{3}(\mathrm{~g}, 1}}\) atom \({\mathrm{)}}\)

1 6
2 2
3 3
4 4
For More Updates join with Us
CHXI06:THERMODYNAMICS

369257 \({\rm{\Delta S}}\) will be highest for

1 \({\rm{C}}{{\rm{a}}_{{\rm{(s)}}}} + {\rm{1/2}}{{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{Ca}}{{\rm{O}}_{{\rm{(s)}}}}\)
2 \({\rm{CaC}}{{\rm{O}}_{{\rm{3(s)}}}} \to {\rm{Ca}}{{\rm{O}}_{{\rm{(s)}}}} + {\rm{C}}{{\rm{O}}_{{\rm{2(\;g)}}}}\)
3 \({{\rm{C}}_{{\rm{(s)}}}} + {{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{C}}{{\rm{O}}_{{\rm{2(g)}}}}\)
4 \({{\rm{N}}_{{\rm{2(g)}}}} + {{\rm{O}}_{{\rm{2(g)}}}} \to {\rm{2N}}{{\rm{O}}_{{\rm{(g)}}}}\)
CHXI06:THERMODYNAMICS

369258 An ideal gas undergoes isothermal expansion at constant pressure. During the process:

1 Enthalpy increases but entropy decreases.
2 Enthalpy remains constant but entropy increases.
3 Enthalpy decreases but entropy increases.
4 Both enthalpy and entropy remain constant.
JEE - 2017
CHXI06:THERMODYNAMICS

369259 A container has hydrogen and oxygen mixture in the ratio of \(4: 1\) by weight then

1 Internal energy of the mixture decreases
2 Internal energy of the mixture increases
3 Entropy of the mixture increases
4 Entropy of the mixture decreases
CHXI06:THERMODYNAMICS

369260 Amongst the following, the total number of reactions processes in which the entropy increases are:
a.
\[\begin{array}{l}
{\rm{2NaHC}}{{\rm{O}}_{\rm{3}}}(\;{\rm{s}}) \to {\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{C}}{{\rm{O}}_{\rm{3}}}(\;{\rm{s}}){\rm{ + C}}{{\rm{O}}_{\rm{2}}}(\;{\rm{g}})\\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{ + }}{{\rm{H}}_{\rm{2}}}{\rm{O}}({\rm{g}})
\end{array}\]
b. A liquid cyrstallises into a solid.
c. Temperature of cystalline solid is raised from zero K to 100 K .
d. Hard boiling of an egg.
e. Devitrification of glass.
f. Stretching of a rubber band.
g. Desalination of water.
h. \({\mathrm{\mathrm{NH}_{3}(\mathrm{~g}, 10 \mathrm{~atm}) \longrightarrow \mathrm{NH}_{3}(\mathrm{~g}, 1}}\) atom \({\mathrm{)}}\)

1 6
2 2
3 3
4 4
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