Which of the following metals continue to burn in the atmosphere of `CO_(2)` ?
(i) `Na`
(ii) `K`
(iii) `Mg`
(iv) `Ca`

Options

A. (i), (ii)
B. (iii), (iv)
C. (i), (ii), (iii), (iv)
D. (ii), (iii), (iv)

Answer

C

Explanation

Certain active metals such as `Na, K, Mg`, and `Ca` continue to burn in the atmosphere of `CO_(2)` as they extract oxygen from it, i.e., `CO_(2)` reacts with burning metal:
`2Ca(s) + CO_(2)(g) overset(Delta)rarr 2CaO(s) + C(s)`