Analytical ChemistryHard
Question
When a salt is heated with dilute H2SO4 and KMnO4 solution, the pink colour of KMnO4 is discharged, the salt is :
Options
A.a sulphite
B.a carbonate
C.a nitrate
D.a bicarbonate
Solution
SO32- reduces KMnO4 to colourless Mn2+
5SO32- + 2MnO4- + 6H+ → 2Mn2+ + 5SO42- + 3H2O
5SO32- + 2MnO4- + 6H+ → 2Mn2+ + 5SO42- + 3H2O
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