Which of the following is`//`are disproportionation redox changes?

Options

A. `(NH_(4))_(2)Cr_(2)O_(7)rarrN_(2)+Cr_(2)O_(3)+4H_(2)O`
B. `5H_(2)O_(2)+2CIO_(2)+2overset(ө)OHrarr2Cl^(ө)+5O_(2)+6H_(2)O`
C. `3ClO^(ө)rarrClO_(3)^(ө)+Cl^(ө)`
D. `2HCuCl_(2)overset("Dilution")underset("with water")rarrCu+Cu^(2+)+4Cl^(ө)+2H^(o+)`

Answer

C, D

Explanation

`2e^(-)+ClO^(ө)rarrCl^(ө)("Reduction")`
`x-2= -1, x= -1`
`x= +1`
`ClO^(ө)rarrClO_(3)^(ө)+4e^(-)("Oxidation")`
`x=1, x=5`
d. In `HCuCl_(2), Cu` is in `+1` oxidation state which disproportionates to `Cu^(2+)` and `cu^(0)`.