MCQ
Consider the following reactions is correct


- A$(a)$ and $(d)$
- ✓$(b)$ and $(d)$
- C$(a)$ and $(b)$
- D$(b),(c)$ and $(d)$


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$(i) $ in filling a group of orbitals of equal energy, it is energetically preferable to assign electrons to empty orbitals rather than pair them into a particular orbital.
$(ii)$ When two electrons are placed in two different orbitals, energy is lower if the spins are parallel.are valid for
${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{ - 4}}\xrightarrow{{MnO_4^ - /{H^ + }}}F{e^{ + 3}} + C{O_2} + NO_3^ - $

$2NOBr(g)\,\,\rightleftharpoons \,\,2NO(g)\,\,+\,\,Br_2(g),$ where $P$ is the total pressure of gases at equilibrium and $P_{Br_2}\,\,=\,\,\frac {P}{9}$