A. Marble chips and 2.0 mol dm−3 HCl(aq)
B. Marble chips and 2.5 mol dm−3 HCl(aq)
C. Powdered marble and 2.5 mol dm−3 HCl(aq)
D. Powdered marble and 2.0 mol dm−3 HCl(aq)
Correct Answer:
Option C – Powdered marble and 2.5 mol dm−3 HCl(aq)
Explanation
Powdered marble reacts more rapidly with HCl than the chips of marble because:
Surface area of powdered marble is more that of chips of marble and hence there is more collisions between the molecules of reactants
Number of molecules increases.
Energy of activation decreases
Marble chips will not react with HCl
