Question

Given the redox reaction:

Answer 1

In this reaction, Al lose electrons and change to Al3+. Cr3+ gain electrons and change to Cr. So the electrons transfer from Al to Cr3+. Protons will not transfer in a chemical reaction. So the answer is (1).

Answer 2

Answer: (1) electrons from Al to $Cr^{3+}$

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.

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

For the given reaction:

$Cr^{3+}+Al\rightarrow Cr+Al^{3+}$

The oxidation state of chromium reduces from +3 to 0, it is getting reduced and gains electrons. The oxidation state of aluminium increases from 0 to +3. Thus, it is getting oxidized and it loses electrons. Thus electrons are transferred from $Al$ to $Cr^{3+}$