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Reducing Nature of Alkali Metals

"Lithium is t...

Question

"Lithium is the only metal which floats on water without any apparent reaction with it."
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Solution

Li floats on water but without any reaction with it.
Lithium has a very low density of 0.534 g/cm³, comparable with that of pine wood. It is the least dense of all elements that are solids at room temperature.

Lithium's density is only about half that of water, so it floats on the surface, fizzing and giving off hydrogen gas. It gradually reacts and disappears, forming a colorless solution of lithium hydroxide and highly flammable hydrogen. The colourless solution is highly alkalic.

$2 L i (s) + 2 H_{2} O \to 2 L i O H (a q) + H_{2} (g)$

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