The correct statement among the following 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 ${\mathrm{K}}_2\mathrm{O}$

The spin-only magnetic moment value of ${\mathrm{B}}_2^{+}$ species is $\times {10}^{-2}\mathrm{BM}$ (Nearest integer)

$[\text{ Given : }\sqrt{3}=1.73]$

How many of the following molecules are with non-zero net dipole moment,