[2001]
(a) 3
(b) 4
(c) 2
(d) 6
Correct Answer: 16.(c)
Solution:
(c) O.N. of $Ni$ in $[Ni(C_2 O_4)_3]^{4-}$
$ =x+3(-2)=-4 \Rightarrow x=-4+6=2 $
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