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Why are the hexaaqua complexes of Sc3+ and Zn+2 colorless, while the hexaaqua complexes of Fe2+, Cr3+, Co2+, Ni2+, and Cu2+ are intensely colored?

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MCQs on the various aspects of inorganic complexes, their physical and chemical properties, and the practical applications that these complexes can have in industrial, analytical, and medicinal chemistry.
 


Why are the hexaaqua complexes of Sc<sup>3+</sup> and Zn<sup>+2</sup> colorless, while the hexaaqua complexes of Fe<sup>2+</sup>, Cr<sup>3+</sup>, Co<sup>2+</sup>, Ni<sup>2+</sup>, and Cu<sup>2+</sup> are intensely colored?





 
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