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)?

Acidic

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Basic

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Amphoteric

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Neutral

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Solution

The correct option is D Basic
A $burns, nitrogen - -------- \to B i o n i c c o m p o u n d H_{2} O - - \to C ↓ + C O_{2} + D m i l k y s o l u t i o n$
Since the solution of C becomes milky on bubbling $C O_{2}$ into it, C is lime water $(C a (O H)_{2}))$ . Thuss, the element A is calcium amd 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 $(N H_{3})$

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