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Thermodynamics — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics1 Mark
MCQ
The important considerations in deciding if a reaction will be spontaneous are :
  • A
    Stability & state of reactants
  • B
    Energy gained & heat evolved
  • C
    Exothermic energy & randomness of the products
  • D
    Endothermic energy & structure of the products
✓

Answer

  1. Exothermic energy & randomness of the products.

Explanation

ΔG = ΔH - TΔS, for a reaction to be spontaneous ΔG, should be negative.

it is guaranteed only if both terms in RHS is negative.

therefore ΔH should be negative and ΔS should be positive.

Negative ΔH implies exothermic energy and positive  ΔS implies randomness of the product.

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