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NEET2005ChemistryThermodynamics (C)Actual

Which of the following pairs of a chemicals reaction is certain to result in a spontaneous reactions?

Options

  1. AExothermic and increasing disorder
  2. BExothermic and decreasing disorder
  3. CEndothermic and increasing disorder
  4. DEndothermic and decreasing disorder

Correct answer

A. Exothermic and increasing disorder

Step-by-step solution

For spontaneous reaction H =-v e , S =+v e Related Theory When the reaction is exothermic (negative H ) but undergoes a decrease in entropy (negative S) , it is the enthalpy term which favours the reaction. In this case, a spontaneous reaction is dependent upon the TAS term being small relative to the H term, so that G is negative. The freezing of water is an example of this type of process. It is spontaneous only at a relatively low temperature. Above 273 ~K , the larger T S value causes the sign of G to be positi

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