Chemistry · Oct / Nov 2018 · Paper 11 · Question 18

Calcium carbonate reacts with dilute hydrochloric acid to produce carbon dioxide. The carbon dioxide is collected using the apparatus shown. The reaction is done four times. For each reaction, 25 g of calcium carbonate and an excess of hydrochloric acid are used. Which reaction mixture fills the gas syringe with carbon dioxide in the shortest time?

1. Alumps of calcium carbonate with 1 mol / dm3 hydrochloric acid
2. Blumps of calcium carbonate with 2 mol / dm3 hydrochloric acid
3. Cpowdered calcium carbonate with 1 mol / dm3 hydrochloric acid
4. Dpowdered calcium carbonate with 2 mol / dm3 hydrochloric acid

As printed in the paper