In chromyl chloride test for confirmation of Cl ^ – ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10 % H _ 2 O _ 2 turns organic layer blue indicating formation of

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Quantrex Academy · Accepted Answer

Correct answer: A. + 6

The chromyl chloride test is used to detect chloride ions in the qualitative analysis. If any chloride salt like sodium chloride is heated with acidified potassium dichromate it produces red colour fumes of chromyl chloride. It confirms the presence of chloride ions in that salt.

${Cl}^{-} + {K}_{2}{Cr}_{2}{O}_{7} + {H}_{2}{SO}_{4} \to {CrO}_{2}{Cl}_{2}\overset{\text{Basic medium}}{\to}\mathop{{CrO}_{4}^{2 -}}_{\text{yellow solution}} + {Cl}^{-}$

Chromate reacts rapidly with hydrogen peroxide to exchange two oxo ligands and become diperoxochromate(VI)

$\mathop{{CrO}_{4}^{2 -}}_{yellowsolution}\to 3 . 10 % {H}_{2}{O}_{2}$ $\begin{array}{ll}1 . Acidification \\ 2 . Amylalcohol\end{array}$ $\mathop{{CrO}_{5}}_{bluecompound}$

In chromyl chloride test for confirmation of Cl ^ – ion, a yellow solution is obtained. Acidification of the solution

Hence, the answer is option A.

In chromyl chloride test for confirmation of Cl ^ – ion, a yellow...

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