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NDA 2022 GAT · General Knowledge · Chemical Reactions · easy

The reaction CaO + H2O gives Ca(OH)2 is an example of a

Single correct option

The reaction CaO + H2O gives Ca(OH)2 is an example of a
  1. A. decomposition reaction
  2. B. displacement reaction
  3. C. combination reaction
  4. D. double displacement reaction
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Answer: (C) combination reaction

Two reactants combine to form a single product, so this is a combination reaction. It is also exothermic, which is why it is called slaking of lime. A decomposition reaction would split one compound, and displacement needs a more reactive element.
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Original question written in the NDA 2022 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake