Q.

In balancing the half-reaction

CN-   CNO-   skeletal

the number of electrons that must be added is

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a

2 on the right

b

1 on the left

c

1 on the right

d

0

answer is D.

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Detailed Solution

                                       CN-   CNO-  

O.N. of nitrogen 4 + x = -1       4 + x -2 = -1

                                    x = - 5              x  = - 3

CN-  is thus oxidized. Thus, two electrons are lost.

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