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Question

e chegg Study i Guided s × e chegg Study I Guided s x G Chegg Study l Guided s x e Consider The Reaction : takeCovalentActivity.do?locator assignment-take&takeAssignmentSessionLocator; assignment-take x Use the References to access important values When the following half reaction is balanced under acidic conditions, what are the coefficients of the species shown? Mn04 In the above half reaction, the oxidation state of manganese changes from to Submit Answer Retry Entire Group 9 more group attempts remaining

Explanation / Answer

Given reaction is

Mn2+ + H2O -----> MnO4- + H+

Here Mn is balanced

Balance H:

Mn2+ + H2O -----> MnO4- + 2H+

Now Balance O:

Mn2+ + 4H2O -----> MnO4- + 2H+

Again balance H:

Mn2+ + 4H2O -----> MnO4- + 8H+

This is the balanced reaction.

In MnO4- the oxidation state of Mn can be found out as:

1*Mn + 4*(-2) = -1

=> Mn = 8-1 = 7

Therefore the oxidation state of Mn in  MnO4- is +7.

So oxidation state of Mn changes from +2 to +7.

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