b
\(NaC{l_{\left( s \right)}} + {K_2}C{r_2}{O_7}_{\left( s \right)} + {H_2}S{O_4}\) \(\left( {{\text{few drop}}} \right)\xrightarrow[{reaction}]{{Non - redox}}\) \(\mathop {Cr{O_2}C{l_2}}\limits_{\left( {orange{\kern 1pt} red{\kern 1pt} vapours} \right)} {\mkern 1mu}  \uparrow  + HO\)

\(Cr{O_2}C{l_2} + OH_{\left( {aq} \right)}^ - \) \(\to \)  \(\mathop {CrO_{4\left( {aq.} \right)}^{2 - }}\limits_{Yellow{\kern 1pt} solution} {\mkern 1mu}  + C{l^ - } + 2{H_2}O\)