Answer:
The last choice is oxidation.
Explanation:
The this is a reaction in which the oxidation number of chromium metal
( 0 ) goes the an oxidation number of 3 in Cr3+.
Answer : The correct option is, [tex]Cr(s)\rightarrow Cr^{3+}(aq)+3e^-[/tex]
Explanation :
Redox reaction : It is a reaction in which the oxidation and reduction reaction takes place simultaneously.
Oxidation reaction : It is a reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.
Reduction reaction : It is a reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.
The correct oxidation-half reaction will be :
[tex]Cr(s)\rightarrow Cr^{3+}(aq)+3e^-[/tex]
In this half oxidation reaction, the oxidation state of 'Cr' changes from (0) to (+3) that means the oxidation state increases that means it shows oxidation.
