Identify the type of bonding in $CCl_4$ and $CaH_2$.

Which of the following compounds is polar and has a central atom with $sp^2$ hybridization?

Which of the following orders is incorrect $:-$

In the given compound,the number of sigma $(\sigma)$ and pi $(\pi)$ bonds are respectively:

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

Give reasons for the following:
$A$. Covalent bonds are directional bonds while ionic bonds are non-directional.
$B$. Water molecule has bent structure whereas carbon dioxide molecule is linear.
$C$. Ethyne molecule is linear.