The element A burns in nitrogen to give an ionic compound B. The compound B reacts with water to give C and D. A solution of C becomes milky on bubbling carbon dioxide. What is the nature of compound D?

Step-by-step solution

A → burns, nitrogen B ionic compound → H 2 O C milky solution + D → CO 2 Since the solution of C becomes milky on bubbling C O 2 into it, C is lime water ( C a O H ) 2 . Thus, the element A is calcium and B is the compound of calcium with nitrogen. Nitrides on reacting with water give the corresponding hydroxide and ammonia. Therefore, A is calcium (Ca) B is calcium nitride C a 3 N 2 . C is lime water C a O H 2 D is ammonia N H 3 . Ca → burns, nitrogen Ca 3 N 2 ionic compound → H 2 O Ca ( OH ) 2 milky solution + NH