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Delta S = Delta H//T holds good for...

`Delta S = Delta H//T` holds good for

A

adiabatic process

B

isothermal reversible phase change

C

a process at constant pressure

D

a process under any conditions

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The correct Answer is:
B
`(Delta S = Delta H // T)` holds good for isothermal reversible phase change.
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Entropy is a measure of randomess of system. When a liquid is converted to the vapour state entropy of the system increases. Entropy in the phase transformation is calculated using Delta S = (Delta H)/(T) but in reversible adiabatic process Delta S will be zero. The rise in temperature in isobaric or isochoric process increases the randomness of system, which is given by Delta S = "2.303 n C log"((T_(2))/(T_(1))) C = C_(P) or C_(V) The temperature at whicgh liquid H_(2)O will be in equrilibrium with its vapour is ( Delta H and Delta S for vapourisation are 50 kJ mol^(-1) and 0.15 kJ mol^(-1)K^(-1) )

Entropy is a measure of randomess of system. When a liquid is converted to the vapour state entropy of the system increases. Entropy in the phase transformation is calculated using Delta S = (Delta H)/(T) but in reversible adiabatic process Delta S will be zero. The rise in temperature in isobaric or isochoric process increases the randomness of system, which is given by Delta S = "2.303 n C log"((T_(2))/(T_(1))) C = C_(P) or C_(V) Entropy change in a reversible adiabatic process is

A porcess is nonspontaneous at evey temperature if (i) Delta H gt 0, Delta S = 0 (ii) Delta H lt 0, Delta S gt 0 (iii) Delta H gt 0, Delta S lt 0 (iv) Delta H = 0, Delta S lt 0

For a given reaction, Delta H = 35.5 kJ mol^(-1) and Delta S = 83.6 JK^(-1) mol(-1) . The reaction is spontaneous at : (Assume that Delta H and Delta S do not vary with temperature)

NIKITA PUBLICATION-Chemical Thermodynamics & Energetics-QUESTION FROM COMPETITIVE EXAM
  1. Delta S = Delta H//T holds good for

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  2. For an endothermic reaction where DeltaH represent the enthalpy of rea...

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  3. Standard entropy of X(2) , Y(2) and XY(3) are 60, 40 and 50JK^(-1)mol...

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  4. Match List I (Equations) with List II (Type of processes) and select t...

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  5. Three moles of an ideal gas expanded spontaneously into vacuum. The wo...

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  6. For vaporization of water at 1 atmospheric pressure the values of Delt...

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  7. The following two reactionas are known FeO(3)(s)+3CO(g)rarr2Fe(s)+CO...

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  8. If the enthaply change for the transition of liquid water to steam is...

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  9. Enthalpy change for the reaction, 4H((g))rarr 2H(2(g)) is -869.6 kJ ...

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  10. Consider the following processes :- {:(,DeltaH(kJ//mol)),((1)/(2)A r...

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  11. In view of the signs of Delta(r)G^(0) for the following reactions Pb...

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  12. The value of enthalpy change (DeltaH) for the reaction C(2)H(5)OH (l...

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  13. Consider the reaction, 4NO(2)(g)+O(2)(g)rarr2N(2)O(5)(g),Delta(r )H=...

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  14. Match the transformation in colums I with appropriate options in colum...

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  15. The entropy change involved in the isothermal reversible expansion of ...

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  16. Which of the following is correct option for the free expansion of an ...

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  17. The Gibbs energy for the decomposition of Al(2)O(3) at 500^(@)C is as...

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  18. The entropy change involved in the isothermal reversible expansion of ...

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  19. The incorrect expression among the following is

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  20. In which of the following reactions,standard reaction entropy change(D...

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  21. The enthalpy of fusion of water is 1.435 kcal//"mole". The molar entro...

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