Calcium is tarnished in air, because it is covered with a thin film of

Question

Calcium is tarnished in air, because it is covered with a thin film of, oxide, hydroxide, carbonate, basic carbonate

MARKS App · Accepted Answer

Calcium is tarnished in air, because it is covered with a thin film of oxide.

C a + O_{2} \to 2 C a O

In moist air, it is slowly tarnished, but decomposes water fairly rapidly giving hydrogen.

C a + 2 H_{2} O \to C a {(O H)}_{2} + H_{2}