What is the oxidation no and coordination no of the central mental ion in ca3(Fe(cn)6)2
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overall charge on the complex ion in NH4[Cr(NH3)2(NCS)4]? ... (a) [Fe(CN) 6]4-, (b) [Ru(NH3)6]3+, (c) [Cr(NH3)6]2+, (d) [EuCl6]4-.
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