Question

Classify carbonate ion on the basis of its valency.

• A. monovalent ion
• B. divalent ion
• C. trivalent ion
• D. pentavalent ion

Answer 1

The correct option is B

divalent ion

Overall charge of carbonate ion will $-2$ because valency of carbon will be +4 while that of one oxygen atom it will be $-2$ and for three oxygen atoms it will become $-6$. So overall charge will be $-2$.