\textbf{221 --} How many of the following statements are correct?
\begin{itemize}
\item Dissolution of gases in water is exothermic.
\item Solutions of some organic substances in water have electrical conductivity.
\item Increasing pressure and temperature reverses the dissolution of gases in water.
\item Decreasing temperature increases the solubility of lithium sulfates and potassium nitrates in water.
\end{itemize}
\begin{center}
(1) 1 \qquad (2) 2 \qquad (3) 3 \qquad (4) 4
\end{center}