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 $NH _{3}$ to give an explosive compound $(C)$. The compounds $A, B$ and $C$ are;

	A	BI	C
(a)	$MnO_2$	$Cl_2$	$Ncl_3$
(b)	$Mno$	$Cl_2$	$NH_4Cl$
(c)	$Mn_3O_4$	$Cl_2$	$NCl_3$
(d)	$MnO_3$	$Cl_2$	$NCl_2$

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (C)

When brown compound $Mn _{3} O _{4}$ is treated with $HCl$, it gives chlorine gas.
$ Mn _{3} O _{4}+8 HCl \rightarrow 3 MnCl _{2}+4 H _{2} O + Cl _{2} \uparrow $
Chlorine gas taken in excess reacts with ammonia to give an explosive compound $NCl _{3} .$
$ NH _{3}+3 Cl _{2} \text { (excess) } \rightarrow NCl _{3}+3 HCl $
The compounds $A , B$ and $C$ are $A = Mn _{3} O _{4}, B = Cl _{2}, C = NCl _{3}$