Question

The metals that float when treated with water are :

a) Manganese and Sodium

b) Sodium and Calcium

c) Magnesium and Sodium

d) Magnesium and Calcium​

Answer 1

Answer:

Calcium and magnesium are two metals that start floating after treating with water.

Explanation:

Calcium and Magnesium react with water to form respective hydroxides and release hydrogen gas. The reactions are given as:

Ca + 2H2O → Ca(OH)2 + H2

Mg + 2H2O → Mg(OH)2 + H2

The bubbles of the hydrogen gas so formed in the reaction stick to the surface of the metal surface, and thus the metals float on water.