JEE CHEMISTRY MCQ: REDOX REACTIONS

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Application +4 | -1

In the following redox reactions

C{r_2}O_7^{2 - } + F{e^{2 + }}\,\xrightarrow{\,}\,F{e^{3 + }} + C{r^{3 + }}

1 mole of

C{r_2}O_7^{2 - }

oxidises

View answer and explanation

Correct option: D

\mathrm{6\,\,moles\,\,of }\,\,F{e^{2 + }}

Option D (

\mathrm{6\,\,moles\,\,of }\,F{e^{2 + }}

) is correct because 1 mole of

C{r_2}O_7^{2 - }

requires 6 moles of

F{e^{2 + }}

for complete oxidation based on the balanced redox reaction.

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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.