Question

Identify A, B, C, D and choose the correct statement(s):
$A+N_2\stackrel{△}{\to }B\stackrel{H_{2}O}{\to }\underset{whiteppt}{C}\downarrow +D$
White precipitate(C) dissolves in $NaOH$ solution and the gas (D) gives white fumes with $HCl$?

• A. (D) is ammonia gas which on reacting with HCl gives $N{H}_{4}Cl$
• B. Metal A is aluminium
• C. B is $Al{N}_3$
• D. White precipitate (C) is $A{l}_2{O}_3$

Answer 1

Answer: (A), (B)

Metal A is aluminium

$\underset{A}{2Al}+N_2\stackrel{△}{\to }\underset{B}{2AlN}\underset{B}{A}lN+H_{2}O\to \underset{C}{Al(OH{)}_3}\downarrow +\underset{D}{N{H}_3}$
$\underset{C}{Al(OH{)}_3}\underset{\left(dissolves\right)}{\stackrel{NaOH}{}}NaAl{O}_2+H_{2}O$
$\underset{D}{N{H}_3}\stackrel{HCl}{\to }\underset{whitefumes}{N{H}_{4}Cl}$