Question
Element Aburns in nitrogen to give an ionic compound B. Compound B reacts with water to give C and D. A solution of C becomes milky on bubbling carbon dioxide. Identify A, B, C and D.
✓
Answer
Element A is Calcium
$3\text{Ca}+\text{N}_2\xrightarrow{ \ \ \ \ \ \ \ \ \ \ \ }\text{Ca}_3\text{N}_2\xrightarrow{6\text{H}_2\text{O} }3\text{Ca(OH)}_2+2\text{NH}_3\\ \ \ \ \text{A}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{B}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{C}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{D}$
$\text{Ca(OH)}_2\xrightarrow{\text{CO}_2}\text{CaCO}_3+\text{H}_2\text{O}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Milky}$
Compound, B = $Ca_3N_2$
Compound, C = $Ca(OH)_2$
Compound, D = $NH_3$
$3\text{Ca}+\text{N}_2\xrightarrow{ \ \ \ \ \ \ \ \ \ \ \ }\text{Ca}_3\text{N}_2\xrightarrow{6\text{H}_2\text{O} }3\text{Ca(OH)}_2+2\text{NH}_3\\ \ \ \ \text{A}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{B}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{C}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{D}$
$\text{Ca(OH)}_2\xrightarrow{\text{CO}_2}\text{CaCO}_3+\text{H}_2\text{O}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Milky}$
Compound, B = $Ca_3N_2$
Compound, C = $Ca(OH)_2$
Compound, D = $NH_3$
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