During the qualitative analysis of … using dilute … gas is evolved which turns … solution (acidified with dilute …) :

D and F Block Elements

JEE Main 2023 · 30 Jan, Morning shift · Q784

ChemistryEasy158×since 2002Q784

During the qualitative analysis of

\mathrm{SO}_{3}^{2-}

using dilute

\mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{SO}_{2}

gas is evolved which turns

\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}

solution (acidified with dilute

\mathrm{H}_{2} \mathrm{SO}_{4}

) :

JEE Main 2023 · 30 Jan, Morning shift · Q784

ChemistryEasy158×since 2002Q784

During the qualitative analysis of

\mathrm{SO}_{3}^{2-}

using dilute

\mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{SO}_{2}

gas is evolved which turns

\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}

solution (acidified with dilute

\mathrm{H}_{2} \mathrm{SO}_{4}

) :