The correct order of increasing $C-O$ bond strength of $CO, CO_3^{2-}, CO_2$ is

The correct statement among the following is:

Which of the following orders is not correct?

Fill in the blanks given below:
$(i)$ The electronic configuration of noble gases is .......... .
$(ii)$ The bond formed by electrostatic attraction between a cation and an anion is called ........... .
$(iii)$ The octet rule is also known as ............ .
$(iv)$ The equilibrium distance between the centers of two bonded atoms in a molecule is called .......... .

Number of $S-S$ bonds in $H_2S_nO_6$ is:

Arrange the following in the decreasing order of their bond enthalpy: $H_2, O_2, N_2$.