Question

Why does hydrogen stick to calcium. Also if the bubbles of hydrogen are formed how does it stick to surface metal as it has converted into calcium hydroxide?? Please tell.

Answer 1

In general, metals form a metal oxide and hydrogen gas and this metal oxide when soluble in water dissolve further forming a metal hydroxide. But some metals form metal hydroxide directly.

In the case of calcium, the reaction with water is less violent and hydrogen starts floating on water and bubbles of hydrogen gas will stick to the metal surface.