A) \[{{K}_{2}}Mn{{O}_{4}}\]
B) \[Mn{{O}_{2}}\]
C) \[Mn{{(OH)}_{2}}\]
D) \[M{{n}^{2+}}\]
Correct Answer: B
Solution :
\[KMn{{O}_{4}}\] is first reduced to manganate and then to insoluble manganese dioxide. Colour changes first from purple to green and finally becomes colourless. \[2KMn{{O}_{7}}+2KOH\to 2{{K}_{2}}Mn{{O}_{4}}+{{H}_{2}}O+O\] \[2{{K}_{2}}Mn{{O}_{4}}+2{{H}_{2}}O\to 2Mn{{O}_{2}}+4KOH+2O\]
\[2KMn{{O}_{2}}+{{H}_{2}}O\xrightarrow{\text{alkaline}}2Mn{{O}_{2}}+2KOH+3[O]\]
You need to login to perform this action.
You will be redirected in
3 sec
