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Question

Identify the correct formula for hexaaquamanganese(II) ion.

A
[Mn(H2O)6]2+
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B
[Mn(H2O)6]2
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C
[Mn2(H2O)6]+
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D
[Mn(H2O)6]
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Solution

The correct option is A [Mn(H2O)6]2+
The parenthesis after manganese in IUPAC name represents its oxidation state (+2).
Thus, the central metal atom is manganese and its oxidation state is +2.
Aqua - H2O ligand and it is a neutral ligand.
'Hexaaqua' represents six H2O ligands.

Thus, the charge of the coordination entity will be same as the oxidation state of metal.
Hence, the formula of the complex ion is [Mn(H2O)6]2+


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