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, 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 : 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.
Answer:- I think it’s Na or Br.
The answer to yourquestions is the last option Explanation: Cr(s) Cr +3 (aq) + 3e-