sblock Elements - Result Question 71
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)
Show Answer
Solution:
Order of first ionisation energy is $Na> K> Rb> Sc$.
Due to poor shielding effect, removal of one electron from $3 s$ orbital is difficult as compared to $4 s$-orbital.
BETA
