sblock Elements - Result Question 25
####24. Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas $A$ and an alkaline solution. The solution on exposure to air produces a thin solid layer of $B$ on the surface. Identify the compounds $A$ and $B$.
(1996, 3M)
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Solution:
- Order of first ionisation energy is $Sc>Na>K>Rb$.
Due to poor shielding effect, removal of one electron from $4 s$ orbital is difficult as compared to $3 s$-orbital.
