Q.

Which reaction does not represent auto redox or disproportionation ?

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a

Cl2+OH−⟶Cl−+ClO3−+H2O

b

2H2O2⟶H2O+O2

c

2Cu+⟶Cu2++Cu

d

NH42Cr2O7⟶N2+Cr2O3+4H2O

answer is D.

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Detailed Solution

NH42Cr2O7⟶N2+Cr2O3+4H2O This is not disproportination or Auto redox reaction due to ammonium dichromate on strong heating to give N2  and chromic oxide.
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Which reaction does not represent auto redox or disproportionation ?