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BITSAT 2015
Exam
BITSAT
Year
2015
Subject
Chemistry
Chapter
Thermodynamics (C)

BITSAT 2015 · Chemistry · Thermodynamics (C)

A spontaneous reaction is impossible if

A spontaneous reaction is impossible if

Options

  1. Aboth ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} are negative
  2. Bboth ΔH\Delta \mathrm{H} and ΔS\Delta \mathrm{S} are positive
  3. CΔH\Delta \mathrm{H} is negative and ΔS\Delta \mathrm{S} is positive
  4. DΔH\Delta \mathrm{H} is positive and ΔS\Delta \mathrm{S} is negative

Correct answer

D. ΔH\Delta \mathrm{H} is positive and ΔS\Delta \mathrm{S} is negative

Step-by-step solution

ΔG=ΔH−TΔS;ΔG\Delta \mathrm{G}=\Delta \mathrm{H}-\mathrm{T} \Delta \mathrm{S} ; \Delta \mathrm{G} is positive for a reaction to be non-spontaneous when ΔH\Delta \mathrm{H} is positive and ΔS\Delta \mathrm{S} is negative.
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