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Justify the following statements : A...

Justify the following statements :
An exothermic reaction is always thermodyamically spontaneous.

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Verified by Experts

It is false. Exothermic process are not alwars spontaneous. If `Delta S = -ve` and `T Delta S gt Delta H`, the process will ve non spontaneous even if it is exothermic.
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SUBHASH PUBLICATION-CHEMICAL THERMODYNAMICS-Two marks questions and answers :
  1. Explain standard enthalpy of combustion (Delta(c )H^(@)).

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  2. Explain bond dissociation enthalpy.

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  3. Justify the following statements : An exothermic reaction is alway...

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  4. Justify the following statements : The entropy of a substance incre...

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  5. Evaporation of water is an endothermic process but spontaneous. Explai...

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  6. Explain standard enthalpy of solution (Delta(sol)H^(@)).

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  7. At a certain temperature 'T', endothermic reaction A rarr B proceeds v...

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  8. Explain standard enthalpy of atomisation (Delta(s)H^(@))

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  9. Explain with the help of an example, the difference between bond disso...

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  10. What is meant by free energy of a system ? What will be the direction ...

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  11. Why most of the exothermic process (reaction) are spontaneous ?

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  12. The enthalpy of combustion of sulphur is 297 kJ. Write the thermochemi...

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  13. What is the most important condition for a process to be reversible in...

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  14. Why the absolute value of enthalpy cannot be determined ?

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  15. What are the applications of Hess's Law of constant heat summation?

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  16. Explain standard enthalpy of dilution.

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  17. Define Molar enthalpy of fusion.

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  18. Define Molar enthalpy of vapourisation ?

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  19. Define : (a) Enthalpy of atomization (b) Lactic enthalpy.

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  20. Explain Laplace-Lavoisier law.

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