Question

Oxidation number is the number indicating the number of oxygen atoms present in the compound.

• A. True
• B. False

Answer 1

The correct option is B

False

In ionic compounds like $NaCl$, the oxidation number of $Na$ is $+1$ and that of $Cl$ is $-1$. This means the oxidation state of $Na$ is $+1$ and that of $Cl$ is $-1$ when forming a $NaCl$ molecule.
It has nothing to do with the amount of oxygen present in the compound.