Explanation:
(d) Chromyl chloride test
\(4NaCl+{{K}_{2}}C{{r}_{2}}{{O}_{7}}+3{{H}_{2}}S{{O}_{4}}\xrightarrow{\text{heat}}\) \({{K}_{2}}S{{O}_{4}}+2N{{a}_{2}}S{{O}_{4}}+\underset{\text{chromyl chloride (orange }\,\text{red)}\,\,\,}{\mathop{2Cr{{O}_{2}}C{{l}_{2}}+3{{H}_{2}}O\,\,\,\,\,\,\,\,\,\,}}\,\)
\(4NaOH+Cr{{O}_{2}}C{{l}_{2}}\to \underset{\,\,\,\,\,\,\,\text{Sod}\text{. chromate }\,\text{(Yellow)}}{\mathop{2NaCl\ +N{{a}_{2}}Cr{{O}_{4}}+2{{H}_{2}}O}}\,\)
\(N{{a}_{2}}Cr{{O}_{4}}+\ {{(C{{H}_{3}}COO)}_{2}}Pb\to 2C{{H}_{3}}COONa+\) $\underset{\begin{smallmatrix}
\,\,\,\,\,\,\,\,\,\text{Lead chromate} \\
\,\,\,\,\,\,\,\,\text{(yellow ppt}\text{.)}
\end{smallmatrix}}{\mathop{\,\,\,\,\,\,PbCr{{O}_{4}}\downarrow }}\,$
