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Chemistry

State which of the following are oxidation reactions and which are reduction reactions.

(a) (i) Cu ⟶ Cu2+ + 2e-

(ii) Cu2+ + 2e- ⟶ Cu

(iii) Sn4+ + 2e- ⟶ Sn2+

(iv) 2Cl- ⟶ Cl2 + 2e-

(v) Fe2+ ⟶ Fe3+ + 1e-

(vi) X + 2e- ⟶ X2-

(vii) Y - 1e- ⟶ Y1+

(viii) Z3+ + 1e- ⟶ Z2+

(b) (i) Zn ⟶ Zn2+

(ii) S ⟶ S2-

(iii) Sn2+ ⟶ Sn

(iv) Fe2+ ⟶ Fe3+

Chemical Bonding

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Answer

(a) (i) Cu ⟶ Cu2+ + 2e- — Oxidation Reaction

(ii) Cu2+ + 2e- ⟶ Cu — Reduction Reaction

(iii) Sn4+ + 2e- ⟶ Sn2+ — Reduction Reaction

(iv) 2Cl- ⟶ Cl2 + 2e- — Oxidation Reaction

(v) Fe2+ ⟶ Fe3+ + 1e- — Oxidation Reaction

(vi) X + 2e- ⟶ X2- — Reduction Reaction

(vii) Y - 1e- ⟶ Y1+ — Oxidation Reaction

(viii) Z3+ + 1e- ⟶ Z2+ — Reduction Reaction

(b) (i) Zn ⟶ Zn2+ Oxidation Reaction

(ii) S ⟶ S2- — Reduction Reaction

(iii) Sn2+ ⟶ Sn — Reduction Reaction

(iv) Fe2+ ⟶ Fe3+ — Oxidation Reaction

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