Consider the reaction: {Cr}₂{O}₇²-} + ...

NCERT Class XII Chemistry
Chapter - Electrochemistry
Questions with Solutions

Question : 30 of 32

Marks: +1, -0

Consider the reaction:

\mathrm{Cr}_2\mathrm{O}_7^{2-} + 14\mathrm{H}^{+} + 6e^{-} \rightarrow 2\mathrm{Cr}^{3+} + 7\mathrm{H}_2\mathrm{O}

What is the quantity of electricity in coulombs needed to reduce 1 mol of

\mathrm{Cr}_2\mathrm{O}_7^{2-}

Solution:

\mathrm{Cr}_2\mathrm{O}_7^{2-} + 14\mathrm{H}^{+} + 6e^{-} \rightarrow 2\mathrm{Cr}^{3+} + 7\mathrm{H}_2\mathrm{O},

6 \times 96500 \, \text{C} = 579000 \, \text{C}

of electricity is required to reduce 1 mol of

\mathrm{Cr}_2\mathrm{O}_7^{2-}

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