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Q.

Which of the following characteristics will always lead to a spontaneous chemical reaction?

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a

ΔH=+ve;ΔS=+ve

b

ΔH=+ve;ΔS=−ve

c

ΔH=−ve;ΔS=−ve

d

ΔH=−ve;ΔS=+ve

answer is D.

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Detailed Solution

  • ΔH=−ve;ΔS=+ve of the following characteristics will always lead to a spontaneous chemical reaction.
  • ΔG must be negative for a spontaneous reaction. 
  • Since ΔG=ΔH−TΔS, a reaction having ΔH negative and ΔS positive will have  ΔG negative at all temperatures.
  • Hence, option D is correct. 
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