?
(ii) Write the structure of phosphinic acid.
(iii) Write a chemical reaction for the use of phosphoric
acid as a reducing agent. [3]
Answer:
(i)
hybridisation
on iodine tetrahedral structure
(ii) Phosphinic acid is 
[1]
It is monobasic basic having only one ionisable
P-atom is sp3 hybridised, tetrahedral geometry.
(iii) P?H bond in shows
reducing behaviour. It reduces 
to
metallic silver.
[1]
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