Correct decreasing order of bond order of oxygen species in $I$ to $IV$
$(I)$ $Na_2O_2$
$(II)$ $O_2 [AsF_6]$
$(III)$ $CsO_2$
$(IV)$ $O_2$
$(II), (III), (IV) , (I)$
$(II), (III), (I), (IV)$
$(IV) , (III), (II), (I)$
$(II), (IV), (III) , (I)$
Explain formation of $\mathrm{H}_{2}$ and energy level diagram of $\mathrm{H}_{2}$ molecule.
The number and type of bonds in $C_2^{2 - }$ ion in $CaC_2$ are
According to molecular theory, the species among the following that does not exist is
Number of paramagnetic oxides among the following given oxides is ..... .
$\mathrm{Li}_{2} \mathrm{O}, \mathrm{CaO}, \mathrm{Na}_{2} \mathrm{O}_{2}, \mathrm{KO}_{2}, \mathrm{MgO}$ and $\mathrm{K}_{2} \mathrm{O}$
Which is set of paramagnetic molecules or ions