Question

Which reaction does not represent auto redox or disproportionation.
a)Cl2+OH--->Cl+ClO3+H2O
b)2Cu---->Cu2+Cu
c)2H2O2---->H2O+O2
d)(NH4)2Cr2O7--->N2+Cr2O+4H2O

Answer 1

Answer (d)
In every case oxidation states of Cl, Cu, O both decreases and increases but in (d) oxidation state of N only reduces.