Question

The list gives four experiments done with calcium carbonate.
1 acid added
2 alkali added
3 heated strongly
4 water added
Which experiments produced carbon dioxide?

• A. $1$ and $2$
• B. $1$ and $3$
• C. $2$ and $3$
• D. $2$ and $4$

Answer 1

Answer: (B)

$1$ and $3$

Solution:- (B) $1$ and $3$

Calcium carbonate is a salt of a strong base and weak acid and thus considered as a mild base.

Hence, being a base, it can produce carbon dioxide on reaction with acid.

$CaC{O}_3+2HCl⟶CaC{l}_2+C{O}_2\uparrow +H_{2}O$

Calcium carbonate can also produce carbon dioxide on heating.

$CaC{O}_3\stackrel{\Delta }{\to }CaO+C{O}_2\uparrow$