List of top Chemistry Questions on Redox Reactions asked in CUET (UG)

The following reaction can be best described as: \[ 3\mathrm{MnO_4^{2-}}+4\mathrm{H^+} \rightarrow 2\mathrm{MnO_4^-} +\mathrm{MnO_2} +2\mathrm{H_2O} \]
The violet colour of \(KMnO_4\) solution is due to:
\( \mathrm{MnO_4^{2-}} \) in acidic medium disproportionates to :
Formaldehyde undergoes Cannizzaro reaction because
(A) It has alpha-hydrogen atom.
(B) It does not have alpha-hydrogen atom.
(C) It does not undergo self-oxidation and reduction on heating with concentrated alkali.
(D) It undergoes self-oxidation and reduction on heating with concentrated alkali.
\(MnO_4^-\) + H2O + I- → MnO2 + OH- + X
Compound ‘X’ in the above reaction is :