12 g of impure cyanogen undergoes hydrolysis by two different paths.
(i). `(CN)_(2)+4H_(2)Oto(NH_(4))_(2)C_(2)O_(4)`
(ii). `(CN)_(2)+2H_(2)OtoNH_(2)CONH_(2)`
When 11.52 g of pure ammonium carbonate `[(NH_(4))_(2)CO_(3)]` was heated, the exact amount of urea was obtained. 20 " mL of " 1.6 M acidic `KMnO_(4)` is required to completely oxidise `(NH_(4))_(2)C_(2)O_(4)`.
Q. In which reaction, carbon is oxidised?

Options

A. Reaction (i)
B. Reaction (ii)
C. Both
D. none

Answer

B

Explanation

In case (i) oxidation state remains same.
In case (ii) C is oxidised.
`underset(x=3)overset(+3-3)((CN)_(2))toundersetundersetunderset(x=3)(2x=6)(2x-8=-2)(C_(2)O_(4)^(2-))`
In reaction (ii)
`underset(x=3)((CN)_(2))tounderset(-3+2+x-2-3+2=0)(NH_(2)CONH_(2))`
`C^(3+)toC^(4+)+e^(-)`