\textbf{207-} How many of the following statements are correct?
\begin{itemize}
\item Carbon dioxide also says carbon(II) oxide.
\item The oxidation number of phosphorus atom in phosphorus pentabromide is $+5$.
\item The difference in oxidation number of nitrogen atom in ions $\text{NH}_4^+$ and $\overline{\text{NO}_2}$ is $2$.
\item The oxidation number of some elements can be used in naming some molecular compounds.
\item The oxidation number of each atom is the apparent electrical charge assigned to it in the compound.
\end{itemize}
\begin{center}
(1) $1$ \qquad (2) $2$ \qquad (3) $3$ \qquad (4) $4$
\end{center}
\begin{center}
\textit{[Space for calculations]}
\end{center}
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