Analytical ChemistryHard
Question
A mixture upon adding conc. H2SO4 gives deep red fumes. It may contain the anions pair :
Options
A.Cr2O72 - and Cl-
B.Br- and Cr2O72-
C.NO3- and Cl-
D.CrO42- and NO32
Solution
4Cl- + Cr2O72- + 6H+ → 2CrO2Cl2 ↑ (deep red) + 3H2O.
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