Action of Sodium Hydroxide (NaOH) With Zinc, Aluminium and Lead. (Action of Alkalis on Metals)

Complete and balance the following equation:

${\mathrm{ZnCl}}_2+\mathrm{NaOH} \left(\mathrm{excess}\right) \stackrel{}{\to }$

Which one of the following salt solutions on reaction with excess sodium hydroxide solution gives a clear solution finally? Give the name and formula of the final product.$\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2 \left(\mathrm{aq}\right), {\mathrm{CuSO}}_4 \left(\mathrm{aq}\right), {\mathrm{FeCl}}_{} \left(\mathrm{aq}\right), {\mathrm{MgCl}}_2\left(\mathrm{aq}\right).$

Write the observation and balanced equation for the following reaction:

Sodium hydroxide is added drop-wise till in excess of a solution of zinc sulphate.

Name a white insoluble oxide that dissolves when fused with caustic soda or caustic potash.

Name a yellow monoxide that dissolves in hot and concentrated alkali. Give equation.