Which disease is caused by the deficiency of vitamin-C?

Explanation

Step - I balance the loss and gain of electrons
`Cu + 2NO_(3)^(-) rarr 2NO_(2) + Cu^(+2)`
Step - II balance the oxygen and hydrogen atom on both side.
`underset("(balanced redox reaction)")(Cu + 2NO_(3)^(-) + 4H^(+)) rarr 2NO_(2) + Cu^(+2) + 2H_(2)O`