Question

Find the odd one out. Give a reason for your choice

• A. ${\mathrm{CaCO}}_3$
• B. $\mathrm{CaO}$
• C. $\mathrm{C}$
• D. ${\mathrm{CO}}_2$

Answer 1

The correct option is D

${\mathrm{CO}}_2$

The explanation for the correct options:

(D) ${\mathrm{CO}}_2$(Carbon dioxide) :

• There are three states of matter: solids, liquid, and gases.
• ${\mathrm{CO}}_2$(Carbon dioxide) exist in a gaseous state.

The explanation for the incorrect options:

Option (A), (B), and (C)

${\mathrm{CaCO}}_3$(Calcium carbonate) , $\mathrm{CaO}$(Calcium oxide), and $\mathrm{C}$(Carbon) :

• They all exist in a solid state.

Therefore, the correct option is an option (D).