The p-Block Elements

The p-Block Elements

Question

Give reasons:

H3POundergoes disproportionation reaction but H3PO4 does not.

Answer

H3POundergoes disproportionation reaction but H3PO4 does not. This is because in H3PO3, P is in +3 oxidation state which can get oxidised as well as reduced. Thus, H3POgives disproportionation, reaction as:

H3PO3  H3PO4 + PH3

On the other hand, in H3PO4, P is in its maximum oxidation state of +5, which can duly be reduced but not oxidised further. So, H3PO does not show disproportionation.

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