\(\Delta {\rm{S}}\) (entropy change) is the measure of randomness and thus in solid, liquid and gas, the order of entropy is gas \(>\) liquid \(>\) solid. Thus, \(\Delta {\rm{S}}\) is positive for the reaction given in option (3).
CHXI06:THERMODYNAMICS
369279
The value of entropy of solar system is
1 increasing
2 decreasing
3 constant
4 zero
Explanation:
All naturally occurring processes are spontaneous and are accompanied by a net increase in entropy.
CHXI06:THERMODYNAMICS
369280
Which one of the following has \(\Delta \mathrm{S}^{\circ}\) greater than zero?
The entropy \({\text{(}}\Delta {\text{S)}}\) of a reaction is positive if the products are in more random state as compared to reactants. (order of randomness is : gas \(>\) liquid \(>\) solid) \({\text{NaN}}{{\text{O}}_{\text{3}}}\left( {\text{s}} \right) \rightleftharpoons {\text{N}}{{\text{a}}^{\text{ + }}}\left( {{\text{aq}}} \right){\text{ + NO}}_{\text{3}}^{\text{ - }}\left( {{\text{aq}}} \right)\) This process is accompained by increase in randomness beacuse \(\mathrm{Na}^{+}\)and \(\mathrm{NO}_{3}^{-}\)ions are free to move in solution whereas they are not free to move in solid \(\mathrm{NaNO}_{3}\).
AIIMS - 2013
CHXI06:THERMODYNAMICS
369281
For the gas phase reaction, \(\mathrm{\mathrm{PCl}_{5}(g) \rightarrow \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)}\) Which of the following conditions are correct?
1 \(\mathrm{\Delta H=0}\) and \(\mathrm{\Delta S < 0}\)
2 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S>0}\)
3 \(\mathrm{\Delta H < 0}\) and \(\mathrm{\Delta S < 0}\)
4 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S < 0}\)
Explanation:
\(\mathrm{\Delta H=\Delta E+\Delta n_{(g)} R T}\) For the reaction, \(\rm{ \mathrm{PCl}_{5}(g) \rightleftharpoons \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g) \\ \Delta n=2-1=1}\) Thus, the value of \(\mathrm{\Delta H}\) is positive or \(\mathrm{>0}\). \(\rm{\Delta G=\Delta H-T \Delta S}\) For a spontaneous reaction, \(\mathrm{\Delta G}\) must be negative. Since in this reaction \(\mathrm{\Delta H}\) is positive, so for thenegative value of \(\mathrm{\Delta G, \Delta S}\) must be positive or \(\mathrm{>0}\). Hence \(\mathrm{\Delta H>0, \Delta S>0}\)
CHXI06:THERMODYNAMICS
369282
Assertion : Molar entropy of vaporisation of water is different from ethanol. Reason : Water is more polar than ethanol.
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.
Explanation:
The molar entropy of vaporization varies among substances due to differences in molecular structure and intermolecular forces. Water, with strong hydrogen bonding, exhibits a relatively high molar entropy during vaporization compared to ethanol, which, with weaker hydrogen bonding, generally has a lower molar entropy.So, option (2) is correct.
\(\Delta {\rm{S}}\) (entropy change) is the measure of randomness and thus in solid, liquid and gas, the order of entropy is gas \(>\) liquid \(>\) solid. Thus, \(\Delta {\rm{S}}\) is positive for the reaction given in option (3).
CHXI06:THERMODYNAMICS
369279
The value of entropy of solar system is
1 increasing
2 decreasing
3 constant
4 zero
Explanation:
All naturally occurring processes are spontaneous and are accompanied by a net increase in entropy.
CHXI06:THERMODYNAMICS
369280
Which one of the following has \(\Delta \mathrm{S}^{\circ}\) greater than zero?
The entropy \({\text{(}}\Delta {\text{S)}}\) of a reaction is positive if the products are in more random state as compared to reactants. (order of randomness is : gas \(>\) liquid \(>\) solid) \({\text{NaN}}{{\text{O}}_{\text{3}}}\left( {\text{s}} \right) \rightleftharpoons {\text{N}}{{\text{a}}^{\text{ + }}}\left( {{\text{aq}}} \right){\text{ + NO}}_{\text{3}}^{\text{ - }}\left( {{\text{aq}}} \right)\) This process is accompained by increase in randomness beacuse \(\mathrm{Na}^{+}\)and \(\mathrm{NO}_{3}^{-}\)ions are free to move in solution whereas they are not free to move in solid \(\mathrm{NaNO}_{3}\).
AIIMS - 2013
CHXI06:THERMODYNAMICS
369281
For the gas phase reaction, \(\mathrm{\mathrm{PCl}_{5}(g) \rightarrow \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)}\) Which of the following conditions are correct?
1 \(\mathrm{\Delta H=0}\) and \(\mathrm{\Delta S < 0}\)
2 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S>0}\)
3 \(\mathrm{\Delta H < 0}\) and \(\mathrm{\Delta S < 0}\)
4 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S < 0}\)
Explanation:
\(\mathrm{\Delta H=\Delta E+\Delta n_{(g)} R T}\) For the reaction, \(\rm{ \mathrm{PCl}_{5}(g) \rightleftharpoons \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g) \\ \Delta n=2-1=1}\) Thus, the value of \(\mathrm{\Delta H}\) is positive or \(\mathrm{>0}\). \(\rm{\Delta G=\Delta H-T \Delta S}\) For a spontaneous reaction, \(\mathrm{\Delta G}\) must be negative. Since in this reaction \(\mathrm{\Delta H}\) is positive, so for thenegative value of \(\mathrm{\Delta G, \Delta S}\) must be positive or \(\mathrm{>0}\). Hence \(\mathrm{\Delta H>0, \Delta S>0}\)
CHXI06:THERMODYNAMICS
369282
Assertion : Molar entropy of vaporisation of water is different from ethanol. Reason : Water is more polar than ethanol.
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.
Explanation:
The molar entropy of vaporization varies among substances due to differences in molecular structure and intermolecular forces. Water, with strong hydrogen bonding, exhibits a relatively high molar entropy during vaporization compared to ethanol, which, with weaker hydrogen bonding, generally has a lower molar entropy.So, option (2) is correct.
\(\Delta {\rm{S}}\) (entropy change) is the measure of randomness and thus in solid, liquid and gas, the order of entropy is gas \(>\) liquid \(>\) solid. Thus, \(\Delta {\rm{S}}\) is positive for the reaction given in option (3).
CHXI06:THERMODYNAMICS
369279
The value of entropy of solar system is
1 increasing
2 decreasing
3 constant
4 zero
Explanation:
All naturally occurring processes are spontaneous and are accompanied by a net increase in entropy.
CHXI06:THERMODYNAMICS
369280
Which one of the following has \(\Delta \mathrm{S}^{\circ}\) greater than zero?
The entropy \({\text{(}}\Delta {\text{S)}}\) of a reaction is positive if the products are in more random state as compared to reactants. (order of randomness is : gas \(>\) liquid \(>\) solid) \({\text{NaN}}{{\text{O}}_{\text{3}}}\left( {\text{s}} \right) \rightleftharpoons {\text{N}}{{\text{a}}^{\text{ + }}}\left( {{\text{aq}}} \right){\text{ + NO}}_{\text{3}}^{\text{ - }}\left( {{\text{aq}}} \right)\) This process is accompained by increase in randomness beacuse \(\mathrm{Na}^{+}\)and \(\mathrm{NO}_{3}^{-}\)ions are free to move in solution whereas they are not free to move in solid \(\mathrm{NaNO}_{3}\).
AIIMS - 2013
CHXI06:THERMODYNAMICS
369281
For the gas phase reaction, \(\mathrm{\mathrm{PCl}_{5}(g) \rightarrow \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)}\) Which of the following conditions are correct?
1 \(\mathrm{\Delta H=0}\) and \(\mathrm{\Delta S < 0}\)
2 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S>0}\)
3 \(\mathrm{\Delta H < 0}\) and \(\mathrm{\Delta S < 0}\)
4 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S < 0}\)
Explanation:
\(\mathrm{\Delta H=\Delta E+\Delta n_{(g)} R T}\) For the reaction, \(\rm{ \mathrm{PCl}_{5}(g) \rightleftharpoons \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g) \\ \Delta n=2-1=1}\) Thus, the value of \(\mathrm{\Delta H}\) is positive or \(\mathrm{>0}\). \(\rm{\Delta G=\Delta H-T \Delta S}\) For a spontaneous reaction, \(\mathrm{\Delta G}\) must be negative. Since in this reaction \(\mathrm{\Delta H}\) is positive, so for thenegative value of \(\mathrm{\Delta G, \Delta S}\) must be positive or \(\mathrm{>0}\). Hence \(\mathrm{\Delta H>0, \Delta S>0}\)
CHXI06:THERMODYNAMICS
369282
Assertion : Molar entropy of vaporisation of water is different from ethanol. Reason : Water is more polar than ethanol.
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.
Explanation:
The molar entropy of vaporization varies among substances due to differences in molecular structure and intermolecular forces. Water, with strong hydrogen bonding, exhibits a relatively high molar entropy during vaporization compared to ethanol, which, with weaker hydrogen bonding, generally has a lower molar entropy.So, option (2) is correct.
\(\Delta {\rm{S}}\) (entropy change) is the measure of randomness and thus in solid, liquid and gas, the order of entropy is gas \(>\) liquid \(>\) solid. Thus, \(\Delta {\rm{S}}\) is positive for the reaction given in option (3).
CHXI06:THERMODYNAMICS
369279
The value of entropy of solar system is
1 increasing
2 decreasing
3 constant
4 zero
Explanation:
All naturally occurring processes are spontaneous and are accompanied by a net increase in entropy.
CHXI06:THERMODYNAMICS
369280
Which one of the following has \(\Delta \mathrm{S}^{\circ}\) greater than zero?
The entropy \({\text{(}}\Delta {\text{S)}}\) of a reaction is positive if the products are in more random state as compared to reactants. (order of randomness is : gas \(>\) liquid \(>\) solid) \({\text{NaN}}{{\text{O}}_{\text{3}}}\left( {\text{s}} \right) \rightleftharpoons {\text{N}}{{\text{a}}^{\text{ + }}}\left( {{\text{aq}}} \right){\text{ + NO}}_{\text{3}}^{\text{ - }}\left( {{\text{aq}}} \right)\) This process is accompained by increase in randomness beacuse \(\mathrm{Na}^{+}\)and \(\mathrm{NO}_{3}^{-}\)ions are free to move in solution whereas they are not free to move in solid \(\mathrm{NaNO}_{3}\).
AIIMS - 2013
CHXI06:THERMODYNAMICS
369281
For the gas phase reaction, \(\mathrm{\mathrm{PCl}_{5}(g) \rightarrow \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)}\) Which of the following conditions are correct?
1 \(\mathrm{\Delta H=0}\) and \(\mathrm{\Delta S < 0}\)
2 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S>0}\)
3 \(\mathrm{\Delta H < 0}\) and \(\mathrm{\Delta S < 0}\)
4 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S < 0}\)
Explanation:
\(\mathrm{\Delta H=\Delta E+\Delta n_{(g)} R T}\) For the reaction, \(\rm{ \mathrm{PCl}_{5}(g) \rightleftharpoons \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g) \\ \Delta n=2-1=1}\) Thus, the value of \(\mathrm{\Delta H}\) is positive or \(\mathrm{>0}\). \(\rm{\Delta G=\Delta H-T \Delta S}\) For a spontaneous reaction, \(\mathrm{\Delta G}\) must be negative. Since in this reaction \(\mathrm{\Delta H}\) is positive, so for thenegative value of \(\mathrm{\Delta G, \Delta S}\) must be positive or \(\mathrm{>0}\). Hence \(\mathrm{\Delta H>0, \Delta S>0}\)
CHXI06:THERMODYNAMICS
369282
Assertion : Molar entropy of vaporisation of water is different from ethanol. Reason : Water is more polar than ethanol.
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.
Explanation:
The molar entropy of vaporization varies among substances due to differences in molecular structure and intermolecular forces. Water, with strong hydrogen bonding, exhibits a relatively high molar entropy during vaporization compared to ethanol, which, with weaker hydrogen bonding, generally has a lower molar entropy.So, option (2) is correct.
\(\Delta {\rm{S}}\) (entropy change) is the measure of randomness and thus in solid, liquid and gas, the order of entropy is gas \(>\) liquid \(>\) solid. Thus, \(\Delta {\rm{S}}\) is positive for the reaction given in option (3).
CHXI06:THERMODYNAMICS
369279
The value of entropy of solar system is
1 increasing
2 decreasing
3 constant
4 zero
Explanation:
All naturally occurring processes are spontaneous and are accompanied by a net increase in entropy.
CHXI06:THERMODYNAMICS
369280
Which one of the following has \(\Delta \mathrm{S}^{\circ}\) greater than zero?
The entropy \({\text{(}}\Delta {\text{S)}}\) of a reaction is positive if the products are in more random state as compared to reactants. (order of randomness is : gas \(>\) liquid \(>\) solid) \({\text{NaN}}{{\text{O}}_{\text{3}}}\left( {\text{s}} \right) \rightleftharpoons {\text{N}}{{\text{a}}^{\text{ + }}}\left( {{\text{aq}}} \right){\text{ + NO}}_{\text{3}}^{\text{ - }}\left( {{\text{aq}}} \right)\) This process is accompained by increase in randomness beacuse \(\mathrm{Na}^{+}\)and \(\mathrm{NO}_{3}^{-}\)ions are free to move in solution whereas they are not free to move in solid \(\mathrm{NaNO}_{3}\).
AIIMS - 2013
CHXI06:THERMODYNAMICS
369281
For the gas phase reaction, \(\mathrm{\mathrm{PCl}_{5}(g) \rightarrow \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)}\) Which of the following conditions are correct?
1 \(\mathrm{\Delta H=0}\) and \(\mathrm{\Delta S < 0}\)
2 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S>0}\)
3 \(\mathrm{\Delta H < 0}\) and \(\mathrm{\Delta S < 0}\)
4 \(\mathrm{\Delta H>0}\) and \(\mathrm{\Delta S < 0}\)
Explanation:
\(\mathrm{\Delta H=\Delta E+\Delta n_{(g)} R T}\) For the reaction, \(\rm{ \mathrm{PCl}_{5}(g) \rightleftharpoons \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g) \\ \Delta n=2-1=1}\) Thus, the value of \(\mathrm{\Delta H}\) is positive or \(\mathrm{>0}\). \(\rm{\Delta G=\Delta H-T \Delta S}\) For a spontaneous reaction, \(\mathrm{\Delta G}\) must be negative. Since in this reaction \(\mathrm{\Delta H}\) is positive, so for thenegative value of \(\mathrm{\Delta G, \Delta S}\) must be positive or \(\mathrm{>0}\). Hence \(\mathrm{\Delta H>0, \Delta S>0}\)
CHXI06:THERMODYNAMICS
369282
Assertion : Molar entropy of vaporisation of water is different from ethanol. Reason : Water is more polar than ethanol.
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.
Explanation:
The molar entropy of vaporization varies among substances due to differences in molecular structure and intermolecular forces. Water, with strong hydrogen bonding, exhibits a relatively high molar entropy during vaporization compared to ethanol, which, with weaker hydrogen bonding, generally has a lower molar entropy.So, option (2) is correct.
