Which of the following reactions are disproportionation reaction? ${\rm{(a}})\,2{\rm{C}}{{\rm{u}}^ + }\, \to \,{\rm{C}}{{\rm{u}}^{2 + }}\, + \,{\rm{C}}{{\rm{u}}^0}\,$ ${\rm{(b}})\,{\rm{3MnO}}_{\rm{4}}^{{\rm{2}} - }{\rm{ + 4}}{{\rm{H}}^{\rm{ + }}}\, \to \,{\rm{2MnO}}_{\rm{4}}^ - \,{\rm{ + }}\,{\rm{Mn}}{{\rm{O}}_{\rm{2}}}\,{\rm{ + }}\,{\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}$ ${\rm{(c)}}\,{\rm{2KMn}}{{\rm{O}}_{\rm{4}}}\xrightarrow{\Delta }\,{{\rm{K}}_{\rm{2}}}{\rm{Mn}}{{\rm{O}}_{\rm{4}}}{\rm{ + Mn}}{{\rm{O}}_{\rm{2}}}\,\,{\rm{ + }}\,{{\rm{O}}_{\rm{2}}}$ ${\rm{(d)}}\,{\rm{2MnO}}_{\rm{4}}^ - \, + \,{\rm{3M}}{{\rm{n}}^{2 + }}\, + \,{\rm{2}}{{\rm{H}}_{\rm{2}}}{\rm{O}}\, \to \,5{\rm{Mn}}{{\rm{O}}_2}{\rm{ + 4}}{{\rm{H}}^ \oplus }$ Select the correct option from the following

NEET UG CHEMISTRY MCQ: REDOX REACTIONS

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Which of the following reactions are disproportionation reaction?

\mathrm{(a})\,2\mathrm{C}{\mathrm{u}^ + }\, \to \,\mathrm{C}{\mathrm{u}^{2 + }}\, + \,\mathrm{C}{\mathrm{u}^0}\,

\mathrm{(b})\,\mathrm{3MnO}_\mathrm{4}^{\mathrm{2} - }\mathrm{ + 4}{\mathrm{H}^\mathrm{ + }}\, \to \,\mathrm{2MnO}_\mathrm{4}^ - \,\mathrm{ + }\,\mathrm{Mn}{\mathrm{O}_\mathrm{2}}\,\mathrm{ + }\,\mathrm{2}{\mathrm{H}_\mathrm{2}}\mathrm{O}

\mathrm{(c)}\,\mathrm{2KMn}{\mathrm{O}_\mathrm{4}}\xrightarrow{\Delta }\,{\mathrm{K}_\mathrm{2}}\mathrm{Mn}{\mathrm{O}_\mathrm{4}}\mathrm{ + Mn}{\mathrm{O}_\mathrm{2}}\,\,\mathrm{ + }\,{\mathrm{O}_\mathrm{2}}

\mathrm{(d)}\,\mathrm{2MnO}_\mathrm{4}^ - \, + \,\mathrm{3M}{\mathrm{n}^{2 + }}\, + \,\mathrm{2}{\mathrm{H}_\mathrm{2}}\mathrm{O}\, \to \,5\mathrm{Mn}{\mathrm{O}_2}\mathrm{ + 4}{\mathrm{H}^ \oplus }

Select the correct option from the following

View answer and explanation

Correct option: A

(a) and (b) only

Option A is correct because disproportionation involves a single element being simultaneously oxidized and reduced, which occurs in reactions (a) and (b).

NEET UG CHEMISTRY MCQ: REDOX REACTIONS

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