? How is it possible to have half
water molecule attached to 
?
(b) State one difference between strong electrolyte and
weak electrolyte giving one example of each.
(c) When electricity is passed through the aqueous
solution of sodium chloride, three products are obtained. Why is this process
called chlor-alkali?
Answer:
(a)
Actually, two formula units of 
share one molecule
of water. So, for the sake of convenience the formula of Plaster of Paris is
written as 
It does not mean that half molecule of
water is attached to 
(1)
(b) In aqueous solution, strong electrolyte like
dissociates completely into
its ions whereas weak electrolyte such as carbonic acid 
dissociates
into its ions only partially. (2)
(c) When electricity is passed through aqueous solution of
NaCI, the three products formed are; sodium hydroxide, chlorine and hydrogen. 
In the word chlor-alkali, chlor stands for chlorine and
alkali stands for sodium hydroxide. So, the process is called chlor-alkali.
(2)
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