The Born-Haber cycle is used to determine:

Which of the following is the correct increasing order of $O-O$ bond length in $O_2$,$O_3$,and $H_2O_2$?

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 ........... .

Consider the following statements:
$A$. $NF_3$ molecule has a trigonal planar structure.
$B$. Bond length of $N_2$ is shorter than $O_2$.
$C$. Isoelectronic molecules or ions have identical bond order.
$D$. Dipole moment of $H_2S$ is higher than that of water molecule.
Choose the correct answer from the options below:

Identify the correct thermal stability orders among the following:
$(a) BeSO_4 < MgSO_4 < CaSO_4 < SrSO_4 < BaSO_4$
$(b) HF > H_2O > NH_3 > CH_4$
$(c) NH_3 > PH_3 > AsH_3 > SbH_3$
$(d) LiCl > BeCl_2 > BCl_3 > CCl_4$
$(e) Na_2CO_3 > MgCO_3 > Al_2(CO_3)_3$
$(f) Li_2CO_3 < Na_2CO_3 < K_2CO_3 < Rb_2CO_3 < Cs_2CO_3$

Arrange the following in decreasing order of their bond length: $HF, HCl, HBr, HI$. Provide the reason.