NEET Sample Paper NEET Sample Test Paper-87

Equivalent weighs of \[KMn{{O}_{4}}\] acidic medium, neutral medium and concentrated alkaline medium respectively are \[\frac{M}{5},\]\[\frac{M}{1},\]\[\frac{M}{3}.\]Reduced products can be

A) \[Mn{{O}_{2}},\]\[MnO{}_{4}^{2-},\]\[M{{n}^{2+}}\]

B) \[Mn{{O}_{2}},\]\[M{{n}^{2+}},\]\[MnO{}_{4}^{2-}\]

C) \[M{{n}^{2+}},\]\[MnO{}_{4}^{2-},\]\[Mn{{O}_{2}}\]

D) \[M{{n}^{2+}},\]\[Mn{{O}_{2}},\]\[MnO{}_{4}^{2-}\]

Correct Answer: C

Solution :

[c]

	Change	Equiv. mass
\[\underset{+7}{\mathop{MnO_{4}^{-}}}\,\xrightarrow{{{H}^{+}}}\underset{+2}{\mathop{M{{n}^{2+}}}}\,\]	5	\[\frac{M}{5}\]
\[\underset{+7}{\mathop{MnO_{4}^{-}}}\,\xrightarrow{{{H}_{2}}O}\underset{+6}{\mathop{MnO_{4}^{2-}}}\,\]	1	\[M\]
\[\underset{+7}{\mathop{MnO_{4}^{-}}}\,\xrightarrow{O{{H}^{-}}}\underset{+4}{\mathop{Mn{{O}_{2}}}}\,\]	3	\[\frac{M}{3}\]