Which of the following is not the raw material in Solvay process?
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Raw materials of the Solvay process:
\begin{itemize}
\item Brine (\(\mathrm{NaCl}\))
\item Limestone (\(\mathrm{CaCO_3}\))
\item Ammonia (\(\mathrm{NH_3}\))
\item Water
\end{itemize}
The major by-product formed is \(\mathrm{CaCl_2}\).
Concept: Solvay process raw materials: NaCl, NH₃, CaCO₃ (limestone). CaCl₂ is a by-product. Step 1: CaCl₂ is obtained as by-product, not used as raw material. Step 2: Write the final answer. \(\boxed{\mathrm{CaCl_2}}\)