KVPY Sample Paper KVPY Stream-SX Model Paper-26

Equivalent weight of \[MnO_{4}^{-}\] in acidic, basic and neutral media are in the ratio of-

A) \[3:5:15\]

B) \[5:3:1\]

C) \[5:1:3\]

D) \[3:5:5\]

Correct Answer: D

Solution :

Acidic medium: \[MnO_{4}^{-}+8{{H}^{+}}+5{{e}^{-}}\to M{{n}^{2+}}+4{{H}_{2}}O\]

Besic medium: \[MnO_{4}^{-}+2{{H}_{2}}O+3{{e}^{-}}\to Mn{{O}_{2}}+4OH\]

Neutral medium: \[MnO_{4}^{-}+2{{H}_{2}}O+3{{e}^{-}}\to Mn{{O}_{2}}+4OH\]