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Chemistry Question on Electrochemistry

Which of the following processes occurs in the electrolysis of an aqueous solution of nickel chloride at nickel anode?

A

Ni2++2e−→Ni{Ni^{2+} + 2e^- \rightarrow Ni}

B

2H++2e−→H2{2H^+ + 2e^- \rightarrow H_2}

C

Ni→Ni2++2e−{Ni \rightarrow Ni^{2+} + 2e^-}

D

2Cl−→Cl2+2e−{2Cl^- \rightarrow Cl_2 + 2e^-}

Answer

Ni→Ni2++2e−{Ni \rightarrow Ni^{2+} + 2e^-}

Explanation

Solution

At anode oxidation takes place. The possible reactions are : 2Cl−→Cl2+2e−:E=−1.26 V(I){2Cl^- \rightarrow Cl_2 + 2e^- : E = -1.26\, V (I)}

Ni→Ni2++2e−:E=+0.25 V(II){Ni \rightarrow Ni^{2+} + 2e^- : E = + 0.25 \,V (II)} As the oxidation potential of (II) is positive and hence will take place at anode.