The wave functions of Is-orbitals of two hydrogen atoms are ` Psi_(A) " and " Psi _(B) . Psi_(A) " and " Psi_(B)` are linearly combine to form two molecular orbitals `( sigma " and " sigma^(**))` . Which of the following statements are correct ?
I . ` sigma^(**)` equal to ` (Psi_(A) - Psi_(B))` .
In ` sigma` - orbital, one nodal plance is present in between two nuclei .
III. The energy of ` sigma`-orbital is lower then the energy of `sigma`-orbital .