Which one of the following forms a complex with an excess of $CN^{-}$ (cyanide) having a coordination number of two?
- A$Cu^{+}$
- B$Ag^{+}$
- C$Ni^{2+}$
- D$Fe^{2+}$
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The number of neutral molecules or negative groups attached to the central metal atom in a complex ion is called:
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