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Q.

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

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a

it floats on the surface of kerosene because of low density

b

it reacts with kerosene

c

it does not react with air and H2O

d

none of the above

answer is B.

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Detailed Solution

Due to their high reactivity with atomspheric air alkali metals generally stored in Kerosene, But "Li" can't be strored in Kerosene it's low density "Li" floats on the surface of keronene, and hence it is wrappred in paraffin wax

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