Ionic bond - formation, factors and lattice enthalpy — practice questions

Question 1 · difficulty L2 · understanding

The number of following factors which affect the percent covalent character of the ionic bond is _________ (A) Polarising power of cation (B) Extent of distortion of anion (C) Polarisability of the anion (D) Polarising power of anion

Question 2 · difficulty L2 · understanding

Arrange the bonds in order of increasing ionic character in the molecules. $\mathrm{LiF}$, $\mathrm{K}_2 \mathrm{O}, \mathrm{N}_2, \mathrm{SO}_2$ and $\mathrm{ClF}_3$ :

• A. $\mathrm{N}_2<\mathrm{SO}_2<\mathrm{ClF}_3<\mathrm{K}_2 \mathrm{O}<\mathrm{LiF}$
• B. $\mathrm{ClF}_3<\mathrm{N}_2<\mathrm{SO}_2<\mathrm{K}_2 \mathrm{O}<\mathrm{LiF}$
• C. $\mathrm{LiF}<\mathrm{K}_2 \mathrm{O}<\mathrm{ClF}_3<\mathrm{SO}_2<\mathrm{N}_2$
• D. $\mathrm{N}_2<\mathrm{ClF}_3<\mathrm{SO}_2<\mathrm{K}_2 \mathrm{O}<\mathrm{LiF}$

Question 3 · difficulty L3 · understanding

Which of the following is least ionic?

• A. CoCl$$_2$$
• B. KCl
• C. BaCl$$_2$$
• D. AgCl

Question 4 · difficulty L3 · understanding

The correct set from the following in which both pairs are in correct order of melting point is :

• A. LiCl > LiF ; NaCl > MgO
• B. LiCl > LiF ; MgO > NaCl
• C. LiF > LiCl ; NaCl > MgO
• D. LiF > LiCl ; MgO > NaCl

Question 5 · difficulty L3 · understanding

Which one of the following represents all isoelectronic species ?

• A. $$\mathrm{Na}^{+}, \mathrm{Cl}^{-}, \mathrm{O}^{-}, \mathrm{NO}^{+}$$
• B. $$\mathrm{N}_2 \mathrm{O}, \mathrm{N}_2 \mathrm{O}_4, \mathrm{NO}^{+}, \mathrm{NO}$$
• C. $$\mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{O}^{-}, \mathrm{F}^{-}$$
• D. $$\mathrm{Ca}^{2+}, \mathrm{Ar}, \mathrm{K}^{+}, \mathrm{Cl}^{-}$$