Question

Match the following metals with their metallic salt formed when they react with NaOH.

• A. Sodium zincate
• B. Sodium plumbite
• C. Sodium aluminate

Answer 1

Aluminium (Al), lead (Pb) and zinc (Zn) react with NaOH to produce the corresponding metallic salt along with the evolution of hydrogen gas.

Zn produces sodium zincate $\left({\mathrm{Na}}_2{\mathrm{ZnO}}_2\right)$, Pb produces sodium plumbite $\left({\mathrm{NaPbO}}_2\right)$ and Al produces sodium aluminate $\left({\mathrm{NaAlO}}_2\right)$.

$Zn\left(s\right)+2NaOH\left(aq\right)\to N{a}_{2}Zn{O}_2\left(aq\right)+H_2\left(g\right)$

$Pb\left(s\right)+2NaOH\left(aq\right)\to N{a}_{2}Pb{O}_2\left(aq\right)+H_2\left(g\right)$

$2Al\left(s\right)+2NaOH\left(aq\right)+2H_{2}O\left(l\right)\to 2NaAl{O}_2\left(aq\right)+3H_2\left(g\right)$