Question

When a brown compound of $Mn(A)$ is treated with $HCl$, it gives a gas $(B)$. The gas $(B)$ taken in excess reacts with $N{H}_3$ to give an explosive compound $(C)$. The compounds $A,B$ and $C$ are;

	A	BI	C
(a)	$Mn{O}_2$	$C{l}_2$	$Nc{l}_3$
(b)	$Mno$	$C{l}_2$	$N{H}_{4}Cl$
(c)	$M{n}_3{O}_4$	$C{l}_2$	$NC{l}_3$
(d)	$Mn{O}_3$	$C{l}_2$	$NC{l}_2$

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (C)

When brown compound $M{n}_3{O}_4$ is treated with $HCl$, it gives chlorine gas.
$M{n}_3{O}_4+8HCl\to 3MnC{l}_2+4H_{2}O+C{l}_2\uparrow$
Chlorine gas taken in excess reacts with ammonia to give an explosive compound $NC{l}_3.$
$N{H}_3+3C{l}_2\text{ (excess) }\to NC{l}_3+3HCl$
The compounds $A,B$ and $C$ are $A=M{n}_3{O}_4,B=C{l}_2,C=NC{l}_3$