Question

Considering the redox reaction Cr + Ni²⁺ → Cr³⁺ + Ni, how many electrons are transferred in the balanced reaction?

Answer 1

Answer:

ONE ELETRON IS TRENSFERRED

Explanation:

Cr gained one electron

Ni lost one electron

Answer 2

6 electrons are being transferred in the reaction.

Explanation:

Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.

$Cr\rightarrow Cr^{3+}+3e^-$  

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

$Ni^{2+}+2e^-\rightarrow Ni$

On combining the two reactions and balancing:

$Cr\rightarrow Cr^{3+}+3e^-$ $\times 2$

$Ni^{2+}+2e^-\rightarrow Ni$ $\times 3$

$2Cr+3Ni^{2+}\rightarrow 3Ni+2Cr^{3+}$

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