Chemistry - Complete d-block Question with Solution | TestHub

Chromyl chloride dissolves in $\mathrm{NaOH}$ solution to give a yellow solution. The chromate solution changes to blue colour chromium peroxide with hydrogen peroxide.

The reaction will be as follows,

$$\begin{gathered} {\mathrm{CrO}}_2{\mathrm{Cl}}_2+4\mathrm{NaOH}\to {\mathrm{Na}}_2{\mathrm{CrO}}_4+2\mathrm{NaCl}+2{\mathrm{H}}_2\mathrm{O} \\ {{\mathrm{CrO}}_4}^{2-}+2{\mathrm{H}}^{+} +2{\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{CrO}}_5+3{\mathrm{H}}_2\mathrm{O} \end{gathered}$$

Hence, option A is the answer.