Q14 / 160 · WBJEE 2012 · Chemistry

Identify the correct statement from the following in a chemical reaction.

  • A
    The entropy always increases
  • Correct answer
    B
    The change in entropy along with suitable change in enthalpy decides the rate of reaction
  • C
    The enthalpy always decreases
  • D
    Both the enthalpy and the entropy remain constant

Solution

\(\Delta \mathrm{G}(\mathrm{T}, \mathrm{P})=\Delta \mathrm{H}-\mathrm{T} \Delta \mathrm{S}\) gives the free energy of system. When \(\Delta \mathrm{G}(\mathrm{T}, \mathrm{P})<0\), the reaction is spontaneous. When \(\Delta \mathrm{G}(\mathrm{T}, \mathrm{P})>0\), the reaction is non-spontaneous. Hence, entropy changed with a suitable change in enthalpy will decide the rate of the reaction.

Hence, the correct answer is option: 'B'.

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