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

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

NTA AbhyasNTA Abhyas 2020The s-Block Elements

Solution:

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

$Ca+O_{2} \rightarrow 2CaO$

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

$Ca+2H_{2}O \rightarrow Ca\left(O H\right)_{2}+H_{2}$