MDCAT Chemistry MCQ #4530

25 cm³ of a hydrocarbon reacts with 125 cm³ O₂. After reaction, 75 cm³ CO₂ is produced. What is the hydrocarbon?

MDCAT Chemistry MCQ #4530

  1. Question 1

    Q1. 25 cm³ of a hydrocarbon reacts with 125 cm³ O₂. After reaction, 75 cm³ CO₂ is produced. What is the hydrocarbon?

    • A) CH₄
    • B) C₂H₂
    • C) C₂H₄
    • D) C₃H₆

    Answer: C₃H₆

    Explanation: Volume ratio 1:5 O₂ to 3 CO₂. Balanced equation: 2C₃H₆ + 9O₂ → 6CO₂ + 6H₂O. Distractor C uses wrong CO₂ ratio.