Which of the following reactions are always exothermic?

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I. Neutralization Il. Decomposition III. Combustion

A. I and II only
B. I and III only
C. II and IIl only
D. I, II and III

Correct Answer:

Option B = I and III only

Explanation

LIST OF EXOTHERMIC REACTIONS

  • any combustion reaction.
  • a neutralization reaction.
  • rusting of iron (rust steel wool with vinegar)
  • the thermit reaction.
  • the reaction between water and calcium chloride.
  • the reaction between sodium sulfite and bleach (dilute sodium hypochlorite)
  • the reaction between potassium permanganate and glycerol.

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