JEE Main 2022 · 26 Jun · Shift 2 · Chemistry Q68

ChemistrySingle correct+4 / -1Question 68 of 90

Which one of the following is an example of disproportionation reaction ?

\mathrm{3MnO_4^{2-}+4H^+\rightarrow2MnO_4^-+MnO_2+2H_2O}

\mathrm{MnO_4^-+4H^++4e^-\rightarrow MnO_2+2H_2O}

\mathrm{10I^-+2MnO_4^-+16H^+\rightarrow2Mn^{2+}+8H_2O+5I_2}

\mathrm{8MnO_4^-+3S_2O_3^{2-}+H_2O\rightarrow8MnO_2+6SO_4^{2-}+2OH^-}

Answer and worked solution

Official answer: A

Disproportionation. In (A) Mn(VI) goes both up to Mn(VII) and down to Mn(IV).

(A)

Topics:Oxidation number

JEE Main 2022 · 26 Jun · Shift 2, Chemistry question 68