Electrovalent bond formation depends on

Which of the following compounds contains both ionic and covalent bonds?

For ionic solids,choose the correct option using $T$ (True) or $F$ (False) for the following statements:
$(1)$ They have very high melting and boiling points.
$(2)$ They are electrolytes.
$(3)$ They possess directional bond characteristics.
$(4)$ They can have isomorphic types of structures.

$AB$ is an ionic solid. The ionic radii of $A^{+}$ and $B^{-}$ are respectively $r_c$ and $r_a$. Lattice energy of $AB$ is proportional to:

Anhydrous aluminium chloride $(Al_2Cl_6)$ is a covalent compound and soluble in water,giving:

Which of the following compounds contains both polar and non-polar bonds?