The following statements are made in connection with carbon dioxide CO 2 . I . Carbon dioxide is prepared by burning carbon or by the reaction of a carbonate and an acid or by decomposition of lime stone. II . In all these methods of preparation of CO 2 , the elements carbon and oxygen are available in a fixed ratio 3 :   8 . III . When CO 2 is continuously bubbled through lime water, initially lime water turns

Step-by-step solution

I . Carbon dioxide is prepared by burning carbon (or) by the reaction of a carbonate and an acid (or) by decomposition of lime stone. CaCO 3     +   2 HCl     → CaCl 2     + H 2 O     +   CO 2 CaCO 3 → ∆ CaO     + CO 2 II . Samples of carbon dioxide contain carbon and oxygen in the mass ratio of 3   :   8 C     12 3 + O 2 32 8   →   CO 2 III . When carbon dioxide is continuously bubbled through lime wat