Question

Valency of Carbon in ${{\mathrm{CO}}_3}^{2-}$ ion is-

• A. $2$
• B. $3$
• C. $4$
• D. $5$

Answer 1

The correct option is C

$4$

Explanation for correct option:

Option C.

Valency:

• “Valency is the combining capacity of an atom.”
• “The electrons present in the outermost shell of an atom are known as the valence electrons.”

Valency of carbon in Carbonate ion.

• The chemical formula for carbonate ion is ${{\mathrm{CO}}_3}^{2-}$.
• It is a polyatomic anion
• The valency of carbon is $4$ as it has four electrons in its outermost shell.
• The structure of the carbonate ion is shown below:

Explanation for incorrect options:

As the valency of carbon is $4$ in the carbonate ion. Thus options A, B, and D stand incorrect.

Hence, the correct option is C i.e. $4$.