JAMB Chemistry 2025 Objective — Question 37
Question 37 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.
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The gas produced when marble chips react with dilute HCl will
- A. Turn damp red litmus blue
- B. Extinguish a lit splint and turn limewater milkyCorrect
- C. Burn with a blue flame and pop
- D. Turn lead acetate paper black
Explanation
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂. CO₂ is a fire extinguisher (extinguishes splint) and turns limewater (Ca(OH)₂) milky due to CaCO₃ formation.
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