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Q: Which one of the following has a similarity between acids and bases?
  • A. They are used as preservatives
  • B. They have pH less than 7
  • C. Process of mixing acid or base with water is exothermic
  • D. They are bitter
Correct Answer: Option C - If an acid or a base is mixed with water then reaction is an exothermic reaction, because it is due to hydration of constituent ions of acids and bases. Greater the extent of hydration more in exothermic nature.
C. If an acid or a base is mixed with water then reaction is an exothermic reaction, because it is due to hydration of constituent ions of acids and bases. Greater the extent of hydration more in exothermic nature.

Explanations:

If an acid or a base is mixed with water then reaction is an exothermic reaction, because it is due to hydration of constituent ions of acids and bases. Greater the extent of hydration more in exothermic nature.