Question

Burning magnesium ribbon is brought in the gas jar of carbon dioxide.Which of the following is correct?
(i) It keeps on burning
(ii) It gets extinguished
(iii) Although $C{O}_2$ is non-supporter of combustion burning magnesium breaks $C{O}_2$ into carbon and oxygen helps in burning
(iv) Carbon dioxide is the supporter of combustion

• A. (i) and (iv)
• B. (i) and (iii)
• C. (i) and (ii)
• D. (iii) and (iv)

Answer 1

Answer: (B)

(i) and (iii)

Magnesium burns in carbon dioxide because the oxygen in the carbon dioxide is able to bond with magnesium and produce an oxide.
Hence it keeps on burning.
$2Mg\left(s\right)+C{O}_2\left(g\right)\to 2MgO\left(s\right)+C\left(s\right)$
So the correct option is (i) and (iii).