JAMB Chemistry 2012 Objective — Question 29
Question 29 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2012 Objective paper, with the correct answer and a full explanation.
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The highest rate of production of carbon (IV) oxide can be achieved using
- A. 0.05 mol dm⁻³ HCl and 5g powdered CaCO3
- B. 0.05 mol dm⁻³ HCl and 5g lump CaCO3
- C. 0.10 mol dm⁻³ HCl and 5g powdered CaCO3Correct
- D. 0.025mol dm⁻³ HCl and 5g powdered CaCO3
Explanation
Higher concentration and powdered form (greater surface area) both increase reaction rate; the option with both 0.10 mol dm⁻³ HCl and powdered CaCO3 gives the fastest reaction.
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