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Showing posts with label Pott.Dichromate and Pott. Permanganate:. Show all posts
Showing posts with label Pott.Dichromate and Pott. Permanganate:. Show all posts

Wednesday, March 16, 2022

HgCl2 does not give Chromyl Chloride test Why ?

The chromyl chloride test need heating a sample  containing chloride with potassium dichromate and concentrated sulfuric acid.

 If chloride is present, chromyl chloride is formed and red fumes of CrO2Cl2 are released  If there is no chloride present, no red fumes are produced. Chromyl Chloride not formed with fluorides, bromides, iodides and cyanides, it is only test specific for chlorides

Chromyl chloride test is given by only chloride salts which are infer whether there is halide predominantly  ionic while covalent chlorides such as HgCl2 do not generate Cl- ions thus won't give this test.

Sodium chloride, when heated with conc. H 2​ SO 4​ and solid potassium dichromate gives : Chromyl Chloride test:

Sodium chloride, when heated with conc. H2​SO4​ and solid potassium dichromate gives chromyl chloride.

Chromyl chloride vapour also react with NaOH and lead acetate gives corresponding yellow salts.

Related Questions:

(1) What is structure of sodium perborate?

What happene when KmnO4 strongly heated (573k)?

When potassium permanganate strongly then it converted into Magnate ions (Green colour) and MnO2 (Brown black).Ans also gives oxygen gas.

When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of....?

(A) CrO3
(B) Cr2O3
(C) CrO5
(D) CrO4^-2
Solution:
When acidified solution of  K2Cr2O7 are shaken with H2O2 in presence of ether , the ethereal layer turn blue due to the formation of CrO5 ( deep blue in colour).
Hence option (C) is correct.