Oxidation number of potassium in ${{\rm{K}}_{\rm{2}}}{\rm{O}},{{\rm{K}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\,\,\,{\rm{and}}\,\,\,{\rm{K}}{{\rm{O}}_{\rm{2}}},$ respectively, is

$ + 2, + 1\,{\rm{and}}\, + \frac{1}{2}$

JEE CHEMISTRY MCQ: REDOX REACTIONS

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Understanding +4 | -1

Oxidation number of potassium in

{\mathrm{K}_\mathrm{2}}\mathrm{O},{\mathrm{K}_\mathrm{2}}{\mathrm{O}_\mathrm{2}}\,\,\,\mathrm{and}\,\,\,\mathrm{K}{\mathrm{O}_\mathrm{2}},

respectively, is

View answer and explanation

Correct option: C

+ 1, + 1\,\mathrm{and}\, +1

Option C (

+ 1, + 1\,and\, +1

) is correct because alkali metals always have an oxidation state of +1 in their compounds.

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\mathrm{H}

2 \mathrm{KClO}_3 \longrightarrow 2 \mathrm{KCl}+3 \mathrm{O}_2

\mathrm{HNO}_3

\mathrm{HNO}_3

\mathrm{MnO}_4^{-}(\mathrm{aq})+\mathrm{Br}^{-}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MnO}_2(\mathrm{aq})+\mathrm{BrO}_3^{-}(\mathrm{aq})+2 \mathrm{OH}^{-}(\mathrm{aq})

\mathrm{Br}

-1

+5.