fumes
in moist air. Explain.
(iii) In preparation of fluorine by electrolysis of 
anode
and cathode are kept separated by a diaphragm of teflon. Why?
Answer:
(i) Phosphorous and (
) is a
dibasic acid as shown in the following structure
Basicity (= 2) is due to two ionisable 
attached
to O-atoms. H attached to P directly shows reducing behaviour.
[1]
(ii)
fumes in
most air.
It is due to hydrolysis of by the
moisture present in air. HCI is formed which fumes in air. [1]
(iii) 
At anode 
At cathode 
Reaction between 
and 
is very
explosive of anodes and cathodes are not separated, violent reaction taken
place. [1]
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