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In alkaline solution KMnO(4) reacts as f...

In alkaline solution `KMnO_(4)` reacts as follows
`2KMnO_(4)+2KOH rarr 2K_(2)MnO_(4)+H_(2)O+O`
Therefore, its equivalent weight will be

A

31.6

B

52.7

C

79

D

158

Text Solution

Verified by Experts

The correct Answer is:
D
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In permanganate titrations, potassium pemanganats is used an an oxidizing agent in acidic medium. The medium is maintained acidic by the use of dilute sulphuric acid. Potassium permanganate acts as self indicator . The potential equation, when potassium permanganate acts as an oxidizing agent is 2KMnO_(4) + 3H_(2)SO_(4) to K_(2)SO_(4) + 2MnSO_(4) + 3H_(2)O + 5[O] or MnO_(4)^(-) + 8H^(+) + 5e^(-) to Mn^(2+) + 4H_(2)O Before the end point, the solution remains colourless but after teh equivalence point only one extra drop of KMnO_(4) solution imparts pink colour , i.e. appearance of pink colour indicates end point. These titrations are used for estimation of ferrous salts, oxalic acid, oxalates, hydrogen peroxide, As_(2)O_(3) etc. In alkaline condition, KMnO_(4) reacts as follows : 2KMnO_(4) + 2KOH to 2K_(2)MnO_(4) + H_(2)O + [O] Therefore , its equivalent mass will be

In alkaline medium , KMnO_(4) reacts as follows 2KMnO_(4)+2KOH rarr 2K_(2)MnO_(4)+H_(2)O+O Therefore, the equivalent mass of KMnO_(4) will be

MnO_(2)+2KOH+(1)/(2)O_(2) to K_(2)MnO_(4)+H_(2)O

MnO_(2)+2KOH+(1)/(2)O_(2) to K_(2)MnO_(4)+H(2)O

In the following reaction: x KMnO_(4)+y NH_(3) rarr KNO_(3)+MnO_(2)+KOH+H_(2)O x and y are

K_(2)MnO_(4)+H^(+) to KMnO_(4)+MnO_(2)darr

K_(2)MnO_(4)+H^(+) to KMnO_(4)+MnO_(2)darr

KMnO_(4) overset(Delta) to K_(2)MnO_(4)+MnO_(2)+O_(2)uarr

KMnO_(4) overset(Delta) to K_(2)MnO_(4)+MnO_(2)+O_(2)uarr

KMnO_(4) (m.w.=158) oxidises oxalic acid in acid medium to CO_(2) and water as follows : 5C_(2)O_(4)^(2-)+2MnO_(4)^(-)+16H^(+) to 10 CO_(2)+2Mn^(2+)+8H_(2)O What is the equivalent weigth of KMnO_(4) ?