Name the metal salt which is insoluble in ammonium hydroxide. 

Name the metal salt which is soluble in ammonium hydroxide. 

Complete the following reaction. 

${\text{Zn(OH)}}_2\text{+}{\left({\text{NH}}_4\right)}_{\text{2}}{\text{SO}}_{\text{4}}{\text{+2NH}}_4{\text{OH→ \_\_\_\_\_ +4H}}_2\text{O}$

Complete the following equations.

$\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}+\_\_\_\_\_\to \mathrm{N}\mathrm{a}\mathrm{C}\mathrm{l}+{\mathrm{H}}_2\mathrm{O}$

Complete the following equations.

$\mathrm{Z}\mathrm{n}\mathrm{O}+{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4\left(\mathrm{d}\mathrm{i}\mathrm{l}\right)\to \_\_\_\_\_+{\mathrm{H}}_2\mathrm{O}$

Complete the following equations.

$\mathrm{P}\mathrm{b}{\left(\mathrm{O}\mathrm{H}\right)}_2+2\mathrm{K}\mathrm{O}\mathrm{H}\to \_\_\_\_\_+2{\mathrm{H}}_2\mathrm{O}$