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Question

In balancing the following half-reaction:
CNCNO(skeletal), the number of electrons that must be added on the right is :

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Solution

CNCNO
Let the oxidation number of C in CN be x.
x3=1
or, x=+2
Let the oxidation number of C in CNO be y.
y32=1
or, y=4.
So, the oxidation of carbon changes by +2.
CNCNO+2e

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