Question

Why calcium floats on water?

Answer 1

Well when calcium reacts with water the bubbles of hydrogen gas are formed which stick on the surface of calcium and due to this the calcium float on water but hydrogen doesn't catch fire because the heat evolved is very less Hope this helped u ☺

Answer 2

$\huge \underline \mathscr \pink{answer}$

The reaction of calcium with water is less violent. ... Calcium starts floating because the bubbles of hydrogen gas which are formed during the reaction stick to the surface of the metal and hence calcium floats on water