1.

To an acidicsolution of aniona few drops of acidified KMnO_(4) are added. Which one of the following anions , if present wil not decolourise the KMnO_(4) solutions ?

Answer»

`I^(-)`
`CO_(3)^(2-)`
`S^(2-)`
`NO_(2)^(-)`

SOLUTION :`I^(-), S^(2), NO_(2)^(-) and Cl^(-)` decolourise `KMnO_(4)` solution in acidic medium. The chemical equation are given below :
`2MnO_(4)^(-) + 16H^(+) + 10X^(-) to 2MN^(2+) + 8H_(2)O +M 5X_(2) (X^(-) = Cl^(-) , I^(-))`
`2MnO_(4)^(-) + 16H^(+) + 5S^(2-) to 2Mm^(2+) +8 H_(2)O + 5S`
`2MnO_(4)^(-) + 6H^(+)+ 5NO_(2)^(-) to 2Mn^(2+) + 3H_(2)O + 3H_(2)O + 5NO_(3)^(-)`


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