Question

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Proton takes part in co-ordinate bonding.

Answer 1

The formation of the hydronium ion when the water reacts with proton is also an example of the co-ordinate bonding.
There two lone pair of electron in the oxygen atom which is used to form coordinate bond with the proton. Here water acts the donor atom, more specifically it is the oxygen atom in the water that acts as the donor atom and the proton accepts the electron.