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  4. In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized by KMnO4 to

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Q. In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized by $KMnO_4$ to

KEAMKEAM 2013The d-and f-Block Elements

Solution:

In neutral or alkaline mediunt, thiosuphate is quantitavely oxidized by $KMnO _{4}$ to $SO _{4}^{2-}$

$8 MnO _{4}^{-}+3 S _{2} O _{3}^{2-}+ H _{2} O \to 8 MnO _{2}+6 SO _{4}^{2-}+2 OH ^{-}$