is treated with excess of
,
3 moles of 
are obtained. The formula of the complex is
(a) 
(b) 
(c) 
(d) 
Answer:
(d) 1 mole of 
precipitates
one free chloride ion
.
Here, 3 moles of 
are
precipitated by excess of. Hence,
there must be three free 
ions.
So, the formula of the complex can be 
and correct choice is (d).
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