Updated By SaraNextGen

On March 11, 2024, 11:35 AM

Question 7.11:

What is the basicity of H₃PO₄?

Answer:

H₃PO₄

Since there are three OH groups present in H₃PO_4, its basicity is three i.e., it is a tribasic acid.

Question 7.12:

What happens when H₃PO₃ is heated?

Answer:

H₃PO₃, on heating, undergoes disproportionation reaction to form PH₃ and H₃PO₄. The oxidation numbers of P in H₃PO₃, PH₃, and H₃PO₄ are +3, −3, and +5 respectively. As the oxidation number of the same element is decreasing and increasing during a particular reaction, the reaction is a disproportionation reaction.