Discussion
Which one of the following metals burns if kept in air?
Answer: A
The metal that burns if kept in air is sodium.
Sodium is so reactive that it reacts vigorously with oxygen and moisture in the air and can catch fire at room temperature. For this reason it is stored under kerosene, as NCERT's Class 8 text describes.
Magnesium burns with a dazzling white flame, but only when it is ignited by heating; kept in air it merely tarnishes. Zinc and aluminium form a thin protective oxide layer and do not burn on standing in air.
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