JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Lithium is the only alkali metal which is not placed in kerosene but is wrapped in paraffin wax, because:

(A)It reacts with kerosene
(B)It floats on the surface of kerosene because of low densityCorrect
(C)It does not react with air and
(D)None of the above

Answer: (B)

Solution

Lithium has the lowest density of all metals (even lower than kerosene), so it would float on the surface of kerosene rather than staying submerged and protected, exposing it to air; it is therefore wrapped in paraffin wax instead. Lithium does

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Question ID VK-137822