alleryThe reaction of sodium with water at room temperature is
ASlow and endothermic
BNeutral, giving no gas
CVigorous and exothermic, with H₂ gas released
DAbsent — sodium does not react with water
Answer & Solution
Correct answer: C. Vigorous and exothermic, with H₂ gas released
1. Sodium reacts very vigorously with cold water.
2. 2 Na + 2 H₂O → 2 NaOH + H₂↑ + heat.
3. The reaction is highly exothermic — heat released ignites the evolved H₂ gas.
4. That is why solid sodium is kept under kerosene for safety.
_Source: syllabus Science, Ch 3 "Metals and Non-metals", §3.2.2_
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