a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B which

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Akshay (278)

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Answer given by Srijan r correct.

The reaction is

Cr₂O₃ (fusion with alkali) ---> CrO₄^2- (on acidification) --->Cr₂O₇^2- +NH₄Cl ---> (NH₄)₂Cr₂O₇ (on heating)--> Cr₂O₃

The chemical reactions r

2Cr₂O₃ + 8OH^- + 3O₂ --> 4CrO₄^2- + 4H₂O

2CrO₄^2- + H₂SO₄ --> Cr₂O₇^2- + SO₄^2- + H₂O

Cr₂O₇^2- + 2NH₄Cl --> (NH₄)₂Cr₂O₇ +2Cl^-

(NH₄)₂Cr₂O₇ (on heating) --> Cr₂O₃ + N₂ +4H₂O

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