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Balance the following redox reaction : ...

Balance the following redox reaction :
`Cu+NO_(3)^(-)rarrNO_(2)+Cu^(2+)` (Acidic medium).

Text Solution

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(i) `Cu^(0)+overset(+5-2)((NO_(3))^(-))rarroverset(+4-2)(NO_(2))+overset(2+)(Cu^(2+))` Skeleton equation
(ii)
(iii) `dot(Cu)+2NO_(3)^(-)rarrNO_(2)+Cu^(2+)` Equating increase and decrease in O.N
(iv) `Cu + 2NO_(3)^(-) rarr 2NO_(2)+Cu^(2+)` Equating all other atoms except H and O
(v) `Cu+2NO_(3)^(-)rarr2NO_(2)+Cu^(2+)+2H_(2)O` Balancing the no. of O atoms by `2H_(2)O`
(vi) `Cu+2NO_(3)^(-)+4H^(+)rarr2NO+Cu^(2+)+2H_(2)O` Balancing the no. of H atoms by `4H^(+)`.
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