What is the number of electrons gained by Cl atom when n mole of ClO ₄^- is transformed into n mole of ClO ₂^- ion?

Step-by-step solution

Let the oxidation state of Cl in ClO ₄^- be x . x + 4(-2) = -1 x = +7 Let the oxidation state of Cl in ClO ₂^- be y . y + 2(-2) = -1 y = +3 The change in oxidation state of Cl is from +7 to +3 . This means each Cl atom gains 4 electrons during the transformation. For 1 mole of ClO ₄^- , 4 moles of electrons are gained. Therefore, for n moles of ClO ₄^- , the number of moles of electrons gained is 4n . Answer: 4n