Explain the methods to prepare carbon dioxide.

Explanation

(i) On industrial scale it is produced by burning coke in excess of air.
`underset(("coke"))(C)+O_(2)toCO_(2)`
(ii) Calcination of lime produces carbon dioxide as by product.
`CaCO_(3)overset(Delta)(to)CaO+CO_(2)`
(iii) Carbon dioxide is prepared in laboratory by the aciton of dilute hydrochloric acid on metal carbonates.
`CaCO_(3)+2HCl to CaCl_(2)+H_(2)O+CO_(2)`