Two molecular orbitals in the dioxygen have unpaired electrons.
Thus, statement (ii) is incorrect.
The total number of bonding molecular orbitals is the same as the total number of antibonding orbitals in dioxygen.
Thus, the statement (iii) is incorrect.
The number of filled bonding orbitals will not be always the same as a number of filled antibonding orbitals.
Thus, the statement (iv) is incorrect.
Thus, statement (i) is correct i.e. in the formation of dioxygen from oxygen atoms 10 molecular orbitals will be formed.
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