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Suppose that a reaction has Delta H= -40...

Suppose that a reaction has `Delta H= -400kJ and Delta S = - 50J//K`. A t what temperature range will it change from spontaneous to non-spontaneous?

A

0.79K to 0.81 K

B

799 K to 801 K

C

801 K to 799K

D

0.81 K to 0.79 K

Text Solution

Verified by Experts

The correct Answer is:
B
Spontaneous `rArr Delta G lt 0 rArr Delta H - T Delta S lt 0`
`-40 xx 1000 - T(-50) lt 0`
`-40000 + 50T lt 0`
`50T lt 40000`
`T lt 800K` it is spontaneous
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AAKASH SERIES-CHEMICAL THERMODYNAMICS-LECTURE SHEET (EXERCISE-III) (LEVEL - I(MAIN) STRAIGHT OBJECTIVE TYPE QUESTIONS)
  1. Which one of the following has Delta S^(0) greater than zero?

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  2. Which of the following process has negative value of DeltaS?

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  3. For the process Dry ice rarr CO(2(g))

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  4. S(H(2(g)))^(0) = 130.6 JK^(-1) mol^(-1), S(H(2)O((l)))^(0) = 69.9JK^(-...

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  5. The direct conversion of A to B is difficult, hence it is carried out ...

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  6. Enthalpy of vapourisation for water is 186.5 KJ "mole"^(-1). The entro...

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  7. Considering entropy (s) as a thermo dynamic parameter, the criterion f...

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  8. DeltaS("says") "for" 4Fe((s)) + 3O(2) rarr 2Fe(2) O(3(s)) " is" -550 J...

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  9. Suppose that a reaction has Delta H= -400kJ and Delta S = - 50J//K. A ...

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  10. If an endothermic reaction is non-spontaneous at freezing point of wat...

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  11. The favourable conditions for a spontaneous reaction are

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  12. Incorrect statement related to an irreversible process is

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  13. The process of evaporation of a liquid is accompanised by (A) Increa...

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  14. Which of the following is true for a spontaneous process?

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  15. H((aq))^(+) + OH((aq))^(-) rarr H(2)O((l)) , Delta H = -ve and Delta G...

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  16. An equilibrium reaction X + Y hArr W +Z, Delta H= +ve is spontaneous i...

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  17. The correct is

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  18. What of the following relationship is correct?

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  19. Delta G^(0) for the reaction x + y hArr z is -4.606 kcal. The value of...

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  20. (A): Entropy of a perfect crystalline substance at absolute zero is ze...

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