Which of the following are disproportio...

Which of the following are disproportionation redox changes?

`(NH_(4))_(2)Cr_(2)O_(7) rarrN_(2) +Cr_(2)O_(3) + 4H_(2)O`

`5H_(2)O_(2)+2ClO_2 +2OH^(-) rarr2Cl^(-) +5O_(2) +6H_(2)O`

`3ClO^(-) rarr ClO_3^(-)`

`2HCuCl_(2)overset("Dilution with")underset("water")rarrCu + Cu^(2+) + 4CI^(-)+ +2H^(+)`

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The correct Answer is:

C, D

`e+Cl^(+)rarrCl^(-)" "Cu^(+)rarrCu^(2+)+e`
`Cl^(+)rarrCl^(5+)+4e" "Cu^(+)+erarrCu`

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Which of the following disproportionation reaction

`2H_(2)O_(2) to 2H_(2)O+O_(2)`

`2H_(2)O to 2H_(2)+O_(2)`

`2HgO to 2Hg+O_2`

`Mg CO_(3) to MgO+CO_(2)`

`2H_(2)O_(2)rarr2H_(2)O+O_(2)`

`2H_(2)Orarr2H_(2)+O_(2)`

`2HgOrarr2Hg+O_(2)`

`MgCO_(3)rarrMgO+CO_(2)`

`H_(2)SO_(4)` with `NaOH`

In atmosphere, `O_(2)` from `O_(2)` by lightning

Evaporation of `H_(2)O`

Nitrogen oxide form nitrogen and oxygen by lightning