Saleha Pervez and Shikha Goel Solutions for Chapter: Analytical Chemistry: Uses of Sodium and Ammonium Hydroxides, Exercise 1: CHECK POINT 01

Name the class of elements which usually form coloured compounds.

Mention the different colours observed in cationic and combined anionic state of manganese $\left(\mathrm{Mn}\right)$ and chromium $\left(\mathrm{Cr}\right)$.

Classify the following metal salts, whose precipitate is formed by the action of $\mathrm{NaOH}$ which is soluble and insoluble in excess of $\mathrm{NaOH}$ solution.

$\mathrm{C}\mathrm{a}{\left(\mathrm{N}{\mathrm{O}}_3\right)}_2, \mathrm{F}\mathrm{e}\mathrm{S}{\mathrm{O}}_4, \mathrm{C}\mathrm{u}\mathrm{S}{\mathrm{O}}_4, \mathrm{Z}\mathrm{n}\mathrm{S}{\mathrm{O}}_4, \mathrm{P}\mathrm{b}{\left(\mathrm{N}{\mathrm{O}}_3\right)}_2$

Both zinc sulphate and lead nitrate are colourless solid substances. Write the chemical reactions used to identify them.

Name the metal salt which are sparingly soluble in ammonium hydroxide solution.

Name the metal salt which is insoluble in ammonium hydroxide. 

Name the metal salt which is soluble in ammonium hydroxide. 

Complete the following reaction. 

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