allerySodium metal is stored under kerosene mainly to prevent which event?
AIt catching fire on exposure to air
BIt slowly melting at room temperature
CIt losing its metallic ductility
DIt turning into a liquid metal
Answer & Solution
Correct answer: A. It catching fire on exposure to air
1. Sodium is very reactive and combines with oxygen in air even at room temperature.
2. On exposure to air sodium readily catches fire.
3. To prevent such accidents it is kept under kerosene, which cuts off air contact.
4. Melting is not the concern; kerosene storage is about blocking air, so that distractor fails.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.103_
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