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Explainchromyl chlorideTest

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Solution :(i)When POTASSIUMDICHROMATE is heatedwithany chloride saltin the presence of Conc. ` H_(2)SO_(4)`orangered vapoursof CHROMYL chloride` (CrO_(2)Cl_(2))` is evolved.
(iii) This reaction is usedto confirm the presenceof chlorideion in inorganic qualitativeanalysis .
` K_(2)Cr_(2)O_(7) + 4NaCI + 6H_(2)SO_(4) to2KHSO_(4) + 4NaHSO_(4)underset(" Chromylchloride " ) ( 2 CrO_(2) CI_(2))uarr + 3H_(2)O`
(iii) The chromyl chloride vapoursare dissolvedin sodiumhydroxidesolution and thenacidified withacetic ACID andtreated with lead acetate. A yellowprecipitateof lead chromateis OBTAINED.
` CrO_(2)Cl_(2) + 4NaOH toNa_(2)CrO_(4) + 2NaCI + 2H_(2)O`
`Na_(2)CrO_(4) + (CH_(3)COO)_(2) Pb tounderset( " Leadchromate Yellowprecptiate")darr + 2CH_(3) COONa`


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