Cho các phản ứng sau: (1) A + dung dịch NaOH B + C

Câu hỏi :

 $$\begin{gathered} \mathrm{Cho} \mathrm{các} \mathrm{phản} \mathrm{ứng} \mathrm{sau}: \\ \left(1\right) \mathrm{A} + \mathrm{dung} \mathrm{dịch} \mathrm{NaOH} \underset{}{\overset{{\mathrm{t}}^{\mathrm{o}}}{\to }} \mathrm{B} + \mathrm{C} \\ \left(2\right) \mathrm{B} + \mathrm{NaOH} \underset{}{\overset{\mathrm{CaO},{\mathrm{t}}^{\mathrm{o}}}{\to }} \mathrm{khí} \mathrm{D} + \mathrm{E} \\ \left(3\right) \mathrm{D} \underset{\mathrm{làm} \mathrm{lạnh} \mathrm{nhanh} }{\overset{{1500}^{\mathrm{o}}\mathrm{C}}{\to }} \mathrm{F} + \mathrm{H}2 \\ \left(4\right) \mathrm{F} + \mathrm{H}2\mathrm{O}\underset{}{\overset{{\mathrm{HgSO}}_4,{\mathrm{t}}^{\mathrm{o}}}{\to }} \mathrm{C} \\ \mathrm{Các} \mathrm{chất} \mathrm{A} \mathrm{và} \mathrm{C} \mathrm{có} \mathrm{thể} \mathrm{là}: \end{gathered}$$