Chromyl chloride test is used for the detecti | vedclass

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(A) The chromyl chloride test is a specific chemical test used to detect the presence of chloride ions $(Cl^{-})$.When a mixture containing a chloride

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$Cl^{-}$

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(A) The chromyl chloride test is a specific chemical test used to detect the presence of chloride ions $(Cl^{-})$.When a mixture containing a chloride salt is heated with potassium dichromate $(K_2Cr_2O_7)$ and concentrated sulfuric acid $(H_2SO_4)$,deep orange-red fumes of chromyl chloride $(CrO_2Cl_2)$ are evolved.$K_2Cr_2O_7 + 4NaCl + 6H_2SO_4 ightarrow 2KHSO_4 + 4NaHSO_4 + 2CrO_2Cl_2 \uparrow 	ext{ (orange-red fumes)} + 3H_2O$These vapours,when passed into a sodium hydroxide $(NaOH)$ solution,produce a yellow solution of sodium chromate $(Na_2CrO_4)$:$CrO_2Cl_2 + 4NaOH ightarrow Na_2CrO_4 + 2NaCl + 2H_2O$This yellow solution,upon treatment with lead acetate,yields a yellow precipitate of lead chromate $(PbCrO_4)$,confirming the presence of $Cl^{-}$.

Chromyl chloride test is used for the detection of:

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