The number of different types of bonds present in $P_4O_{10}$ is:

In the electronic structure of $H_2SO_4$,the total number of unshared electrons is

Which of the following statements is correct?

The option$(s)$ in which at least three molecules follow the Octet Rule is(are):
$(A)$ $CO_2, C_2H_4, NO$ and $HCl$
$(B)$ $NO_2, O_3, HCl$ and $H_2SO_4$
$(C)$ $BCl_3, NO, NO_2$ and $H_2SO_4$
$(D)$ $CO_2, BCl_3, O_3$ and $C_2H_4$

The total number of lone pairs of electrons on oxygen atoms of ozone $(O_3)$ is $...........$.

Fill in the blanks given below:
$(i)$ The energy required to completely separate one mole of a solid ionic compound into its gaseous constituent ions is called ........... .
$(ii)$ The angle formed between the orbitals containing bonding electrons around the central atom is called ........... .
$(iii)$ The energy required to break one mole of bonds is called ........... .
$(iv)$ The $VSEPR$ theory was proposed by scientists ............ and ........... .