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(a) Explain why it is not advisable to prepare a sample of carbon(IV) oxide using barium carbonate and dilute sulphuric(VI) acid.
(b) State a method that can be used to collect dry carbon(IV) oxide gas. Give a reason.

Answer Text:
(a) - This is because the insoluble barium sulphate produced forms a coating on the surface of the barium carbonate preventing further reaction and evolution of carbon(IV) oxide gas.
(b) - Downward delivery. Because Carbon (IV) oxide is denser than air.