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Question
The effective atomic number of Hg(At. No. 80) in the complex K2[HgI4] is
 
Options:
A .  86
B .  84
C .  82
D .  88
Answer: Option A
:
A
The complex ion is [HgI4]2 and the metal ion is Hg2+
E.A.N = 80 - 2 + 4(2) = 86.

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