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Between $1s-1s$ and $1s-2s$ combinations,which one does not form a molecular orbital? Why?

Match List-$I$ with List-$II$.
List-$I$ List-$II$
$A$. $\Psi_{MO} = \Psi_{A} - \Psi_{B}$ $I$. Dipole moment
$B$. $\mu = Q \times r$ $II$. Bonding molecular orbital
$C$. $\frac{N_{b} - N_{a}}{2}$ $III$. Anti-bonding molecular orbital
$D$. $\Psi_{MO} = \Psi_{A} + \Psi_{B}$ $IV$. Bond order

Which of the following species absorbs maximum energy in its $HOMO-LUMO$ electronic transition?

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The increasing order of bond order of $O_2, O_2^+, O_2^-$,and $O_2^{2-}$ is:

Which of the following molecular orbitals has the maximum number of nodal planes?

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