Waec Model Questions Vol1 2022 Chemistry Question 46

Practice objective / multiple choice question 46 from the 2022 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2022 Chemistry Objective / Multiple Choice Hard Difficulty
Question 46 WAEC_MODEL_QUESTIONS_VOL1 • 2022 • CHEMISTRY • objective

Element Y (a non‑metal, atomic mass 30.0 g mol⁻¹) forms two oxides, Y₂O₃ and Y₂O₅. When 10.0 g of Y₂O₃ is heated in excess O₂, it is completely converted to Y₂O₅ according to Y₂O₃ + O₂ → Y₂O₅. (i) Calculate the mass of O₂ consumed. (ii) State the oxidation state of Y in each oxide.

Answer Options

A. O₂ consumed = 2.5 g; oxidation states: Y = +2 in Y₂O₃, Y = +5 in Y₂O₅
B. O₂ consumed = 3.0 g; oxidation states: Y = +4 in Y₂O₃, Y = +5 in Y₂O₅
Correct Answer C. O₂ consumed = 3.0 g; oxidation states: Y = +3 in Y₂O₃, Y = +5 in Y₂O₅
D. O₂ consumed = 3.5 g; oxidation states: Y = +3 in Y₂O₃, Y = +4 in Y₂O₅
Correct Answer
C
Correct Option:
O₂ consumed = 3.0 g; oxidation states: Y = +3 in Y₂O₃, Y = +5 in Y₂O₅

About This Question

This is Waec Model Questions Vol1 2022 Chemistry Question 46. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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