question_answer

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.