WAEC Chemistry 2011 Theory — Question 25

Question 25 of 31 from the West African Examinations Council (WAEC) Chemistry 2011 Theory paper, with the correct answer and a full explanation.

7(e) What is the oxidation number of: (i) chlorine in I. Cl2; II. ClO3⁻. (ii) Vanadium in V2O5.

Model answer

(i) O.N. of Cl in Cl2 = 0. O.N. of Cl in ClO3⁻ = +5. (ii) Vanadium has an oxidation number of +5 in V2O5.

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