218. White phosphorus spontaneously ignites in air and at room temperature. Therefore, in the laboratory, it is stored under water. What is the role of water in this process?
[(1)] Catalyst (2) Inhibitor
[(3)] Decreasing $E_a$ (4) Increasing $E_a$
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\textbf{218.} White phosphorus spontaneously ignites in air and at room temperature. Therefore, in the laboratory, it is stored under water. What is the role of water in this process?
\begin{itemize}
\item[(1)] Catalyst \hfill (2) Inhibitor
\item[(3)] Decreasing $E_a$ \hfill (4) Increasing $E_a$
\end{itemize}
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