Waec Model Questions Vol1 2025 Chemistry Question 29

Practice objective / multiple choice question 29 from the 2025 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2025 Chemistry Objective / Multiple Choice Hard Difficulty
Question 29 WAEC_MODEL_QUESTIONS_VOL1 • 2025 • CHEMISTRY • objective

A non‑metal X forms two oxides: XO with a molar mass of 47 g mol⁻¹ and X₂O₅ with a molar mass of 142 g mol⁻¹. Determine the atomic mass of X, the oxidation state of X in each oxide, and identify the element.

Answer Options

A. Atomic mass 35 g mol⁻¹; oxidation states +2 in XO and +6 in X₂O₅; element arsenic (As)
Correct Answer B. Atomic mass 31 g mol⁻¹; oxidation states +2 in XO and +5 in X₂O₅; element phosphorus (P)
C. Atomic mass 30 g mol⁻¹; oxidation states +1 in XO and +5 in X₂O₅; element silicon (Si)
D. Atomic mass 32 g mol⁻¹; oxidation states +2 in XO and +4 in X₂O₅; element sulfur (S)
Correct Answer
B
Correct Option:
Atomic mass 31 g mol⁻¹; oxidation states +2 in XO and +5 in X₂O₅; element phosphorus (P)

About This Question

This is Waec Model Questions Vol1 2025 Chemistry Question 29. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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