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WAEC Chemistry 2025 Theory — Question 37

Question 37 of 70 from the West African Examinations Council (WAEC) Chemistry 2025 Theory paper, with the correct answer and a full explanation.

3(d)(ii). Give the oxidation state of phosphorus in each of: I. POCl3; II. PH3; III. P4; IV. H3PO3.

Model answer

I. POCl3: P = +5. II. PH3: P = -3. III. P4: P = 0. IV. H3PO3: P = +4.

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