JAMB Mathematics 2022 Objective — Question 2

Question 2 of 41 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2022 Objective paper, with the correct answer and a full explanation.

If 25 cm³ of hydrogen is sparked with 5 cm³ of oxygen, the volume of the unreacted oxygen is

A. 0 cm³Correct
B. 25 cm³
C. 37.5 cm³
D. 12.5 cm³

Explanation

2H₂ + O₂ → 2H₂O. 25 cm³ H₂ requires 12.5 cm³ O₂. Only 5 cm³ O₂ is available, so O₂ is the limiting reagent. All O₂ is consumed. Unreacted O₂ = 0 cm³.

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