Which of the following metals float in their reactions with cold water?

Gold (Au)

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Zinc (Zn)

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Iron (Fe)

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Calcium (Ca)

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Solution

The correct option is D
Calcium (Ca)

Calcium reacts slowly with water and forms calcium hydroxide, Ca(OH)₂ and hydrogen gas (H₂).

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 float on water.

$C a (s) + 2 H_{2} O (l) \to C a_{(} O H)_{2} (a q) + H_{2} (g)$

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