inorganic

Which of the following rxn. is possible ??
Give reasons--
a.H₃PO₄ decolorising KMnO₄
b.H₄As₂O₇ decolorising Br water.

2 Answers

b) i think Br water decolorises only C=C bond
so this reaction should not be possible

ya,eure u might be right.but in a) both H₃PO₄ and KMnO₄ are at maximum

oxidation states,thus redox reaction will not take place.so,there will be Mn⁷⁺ ion in the product

formed. and we know,the colour arises due to charge transfer phenomena to Mn₊₇.if this ion still

persists, how cn there be decolourisation ?

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