Element A burns in nitrogen to given an ionic compound B. Compound B reacts with water to given C and D. AB solution of C becomes 'Milky' on bubbling carbon dioxide. The element A is
A)Na
B)Mg
C)Ca
D)Be
Correct Answer:
C
Solution :
M may be either Ca or Ba. It is not magnesium because \[\operatorname{Mg} {{\left( OH \right)}_{2}}\] has very low solubility in water.