Question

Which of the following gives carbon dioxide on heating?

• A. Slaked lime
• B. Lime stone
• C. Quick lime
• D. Soda ash

Answer 1

The correct option is B

Lime stone

Explanation for the correct option:

(B) Lime stone

Lime stone$\left({\mathrm{CaCO}}_3\right)$ on heating produces calcium oxide$\left(\mathrm{CaO}\right)$ and carbon dioxide$\left({\mathrm{CO}}_2\right)$.

${\mathrm{CaCO}}_3\left(\mathrm{s}\right)\stackrel{}{\leftrightarrows }\mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{s}\right)$

Explanation for incorrect option(s):

(A) Slaked lime

Slaked lime$\left(\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\right)$ on heating gives calcium oxide and water.

(C) Quick lime

Quick lime$\left(\mathrm{CaO}\right)$ does not dissociate alone on heating.

(D) Soda ash

Soda ash$\left({\mathrm{Na}}_2{\mathrm{CO}}_3\right)$ does not dissociate on heating.

Therefore option (B) is correct.