(B) Phosphorus pentoxide $(P_4O_{10})$ is an oxide of a non-metal.Non-metallic oxides are generally acidic in nature.When phosphorus pentoxide reacts

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(B) Phosphorus pentoxide $(P_4O_{10})$ is an oxide of a non-metal.Non-metallic oxides are generally acidic in nature.When phosphorus pentoxide reacts with water,it forms phosphoric acid $(H_3PO_4)$,which confirms its acidic character:$P_4O_{10} + 6H_2O \rightarrow 4H_3PO_4$.Therefore,the correct option is $B$.