In which change bond order and number of unpaired $e^-$ both are increased
$N_2 \to N_2^{-2}$
${B_2} \to B_2^ - $
$O_2^ - \to O_2^{2 - }$
$O_2^ - \to {O_2}$
The maximum number of hydrogen bonds formed by a water molecule in ice is
When two atomic orbitals combine they form
When two atoms of chlorine combine to form one molecule of chlorine gas, the energy of the molecule
According to molecular orbital theory, the paramagnetism of ${O_2}$ molecule is due to presence of
What is $\mathrm{LCAO}$ ? Explain .