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The P-Block Elements

Question
CBSEENCH12006949

How would your prepare the following: (i) H3PO3, (ii) HI, (iii) HClO4.

Solution

i)Phosphorous acid can be form as 

PCl3 +3H2O (cold) →H3PO3

(ii)HI formed by the reaction of I2 with hydrazine which also yield nitogen gas.

2I2+N2H4→ 4HI +N2


iii) sodium hypochlorite react with hydrochloric acid to give perchloric acid.

NaClO4 +HCl →NaCl +HClO