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Question

In aluminate ion, the coordination number of aluminium is:

A
2
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B
4
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C
6
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D
1
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Solution

The correct option is C 6
Aluminate ion isolated is AlO2.
When in solution, this is surrounded by 4 water molecules, two water molecules react with the oxygen to give overall 4 OH groups. These four hydroxyl groups and two water molecules are held by coordinate bonds in the complex.
Hence the compound has 6 coordinate bonds.

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