Question

A student dropped few pieces of marble in dilute HCl contained in a test tube .The evolved gas was passed through lime water .explain

Answer 1

Marble is made up of calcium carbonate and when strong acid like hydrochloric acid reacts with marble it produce carbon dioxide gas which turns limewater milky.

Reaction is as follows :-

CaCO3 + 2Hcl ---> CaCl2+ CO2+H2O