Which of the following chemical reactions takes place when quick lime reacts with water?

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Accepted Answer

- Quick lime is calcium oxide, $CaO$.
- When $CaO$ reacts with water it undergoes slaking (hydration) to form calcium hydroxide: $CaO(s)+H_2O(l)\rightarrow Ca(OH)_2(s)$.
- Option (1) is wrong because it shows elemental calcium and hydrogen ions instead of calcium hydroxide.
- Options (2) and (4) are combustion reactions (carbon and methane) and are unrelated to quick lime reacting with water.
Therefore the correct reaction is option (3), so the answer is choice c.
FINAL_ANSWER: c

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