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Three of the following describe an exothermic reaction. Which is the odd one out?

  • A.the adiabatic temperature rise is positive
  • B.the reaction absorbs heat from its surroundings
  • C.heat is released as the reaction proceeds
  • D.the equilibrium constant falls with temperature

Answer: B

An endothermic reaction absorbs heat, and none of the other three could then be true. The three together are the signature of an exothermic reaction. Sign of the heat of reaction settles it. Endothermic behaviour is the opposite in each respect.

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