MCQ
Nitrolim is
- A$Ca{C_2} + {N_2}$
- ✓$CaC{N_2} + C$
- C$Ca{(CN)_2} + C$
- D$Ca{(CN)_2} + N{H_4}CN$
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Above conversion can be achieved by

$(I) \,S _{2} O _{4}^{2-}$
$(I I)\, S _{2} O _{5}^{2-}$
$(III) \,S _{2} O _{6}^{2-}$
$E_{F{e^{2 + }}/Fe}^o\, = \, - \,0.44\,\,V\,;\,\,E_{Z{n^{2 + }}/Zn}^o\, = \, - \,0.76\,\,V\,;\,$
$E_{C{u^{ + 2}}/Cu}^o\, = \,0.34\,\,V$
Based on this data, which of the following is the strongest reducing agent ?
