Match the species in List-$I$ with their geometry in List-$II$:

List-$I$	List-$II$
$A. PCl_5$	$I. \text{Tetrahedral}$
$B. BrF_5$	$II. \text{Square Planar}$
$C. BF_4^-$	$III. \text{Trigonal bipyramidal}$
$D. [Ni(CN)_4]^{2-}$	$IV. \text{Square pyramidal}$

Choose the correct answer from the options given below:

Which of the following are isoelectronic species?
$I. CH_{3}^{+}$,$II. H_{3}O^{+}$,$III. NH_{3}$,$IV. CH_{3}^{-}$

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

Which one of the following molecules contains both ionic and covalent bonds?

In which of the following molecules,all atoms are coplanar?

The correct order as indicated in each option is