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  • Which of the following reaction is possible at anode?Option: 1 <img alt="\mathrm{2 Cr ^{3+}+7 H _{2} O \rightarrow Cr _{2} O _{7}^{2-}+14 H ^{+}}" sr

Which of the following reaction is possible at anode?

Option: 1

\mathrm{2 Cr ^{3+}+7 H _{2} O \rightarrow Cr _{2} O _{7}^{2-}+14 H ^{+}}


Option: 2

\mathrm{F_2 \rightarrow 2F^-}


Option: 3

\mathrm{\frac{1}{2} O _{2}+2 H ^{+} \rightarrow H _{2} O}


Option: 4

none of these


Answers (1)

best_answer

 Let's look at oxidation states of the reactants  and the products both

\mathrm{2Cr^{3+}+7H_{2}O\rightarrow \overset{+6}{Cr_{2}}O_{7}^{2-}+14H^{+}}

Here Cr goes from +3 OS to +6 OS, this oxidation reaction is definitely possible at anode

\mathrm{\overset{^{0}}{F_{2}}\rightarrow 2F^{-}}

This is a reduction reaction where O.S of F changes from 0 to -1. Reduction reactions are not possible an anode

\mathrm{\frac{1}{2}\overset{^{0}}{O_{2}}+2H^+{\rightarrow }H_{2}O}

This is also a reduction reaction where OS of Oxygen changes from 0 to -2. Reduction reactions are not possible at anode.

Hence, the correct answer is Option (1)

Posted by

Ritika Harsh

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