A metal dissolves in $3.0 \mathrm{M} \mathrm{NaOH}$ solution with evolution of gas to form a clear, colourless solution. Upon neutralization, the solution forms a gelatinous precipitate. What is the metal?

The reaction takes place for Al as,

$$\begin{gathered} \mathrm{Al}+\mathrm{NaOH}+{\mathrm{H}}_2\mathrm{O}⟶{\mathrm{NaAlO}}_2+\frac{3}{2}{\mathrm{H}}_2 \\ \downarrow {\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O} \end{gathered}$$

                                        $\underset{\mathrm{White} \mathrm{gelatinous} \mathrm{ppt}.}{\mathrm{Al}(\mathrm{OH}{)}_3}\downarrow$

Thus, the metal is Al.