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Chemistry Question on p -Block Elements

P4O10P_4O_{10} dissolves in water to give

A

phosphorous acid

B

orthophosphoric acid

C

hypophosphorus add

D

pyrophosphoric add

Answer

orthophosphoric acid

Explanation

Solution

Phosphorus pentoxide, P4O10P_4O_{10} has great affinity for water and gives orthophosphoric acid as final product. It is therefore named phosphoric anhydride. P4O14−>[2H2O]4HPO3acidmetaphosphoric−>[2H2O]P_4O_{14} {->[2H_2O]} \underset{\overset{\text{metaphosphoric}}{\text{acid}}}{4 HPO_3} {->[2H_2O]} 2H4P2O7acidpyrophosphoric −>[2H2O]4H3PO4orthophosphoric acid \underset{\overset{\text{pyrophosphoric }}{\text{acid}}}{2 H_4P_2O_7} {->[2H_2O]} \underset{\text{orthophosphoric acid}}{4H_3PO_4}