Question

_________ , a greenhouse gas is released during the decomposition of limestone.

• A. Carbon dioxide
• B. Methane
• C. Ozone
• D. Nitrous oxide

Answer 1

The correct option is A Carbon dioxide

Limestone contains calcium carbonate $\left(CaC{O}_3\right)$, which when heated at high temperature decomposes to give calcium oxide $\left(CaO\right)$ and carbon dioxide $\left(C{O}_2\right)$ as shown below.

${\mathrm{CaCO}}_3\left(s\right)\stackrel{\Delta }{\to }\mathrm{CaO}\left(s\right)+{\mathrm{CO}}_2\left(g\right)\mathrm{Calcium}\mathrm{Calcium}\mathrm{Carbon}\mathrm{carbonate}\mathrm{oxide}\mathrm{dioxide}$

Greenhouse gases absorbs infrared rays from the sun and traps heat, thereby increasing the temperature of the Earth's atmosphere.

Although, carbon dioxide ($C{O}_2$), methane $\left(C{H}_4\right)$, ozone $\left(O_3\right)$ and nitrous oxide $\left(N_{2}O\right)$ are greenhouse gases, only $\left(C{O}_2\right)$ is released during decomposition of limestone.