Chemistry - CHEMICAL BONDING Question with Solution | TestHub

(i) ${\mathrm{I}}^{-}>{\mathrm{Br}}^{-}>{\mathrm{Cl}}^{-}>{\mathrm{F}}^{-}$ (order of polarizability) - Correct. Polarizability increases with increasing size of the anion.

(ii) ${\mathrm{Li}}^{+}>{\mathrm{Na}}^{+}>{\mathrm{K}}^{+}>{\mathrm{Cs}}^{+}$ (order of polarising power) - Correct. Polarizing power increases with decreasing cation size and increasing charge.

(iii) ${\mathrm{Li}}^{+}>{\mathrm{Mg}}^{2+}>{\mathrm{Al}}^{3+}$ (order of polarising power) - Incorrect. Polarizing power increases with increasing charge and decreasing size. The correct order is ${\mathrm{Al}}^{3+}>{\mathrm{Mg}}^{2+}>{\mathrm{Li}}^{+}$.

(iv) $\mathrm{LiI}>\mathrm{NaI}>\mathrm{KI}$ (order of ionic character) - Incorrect. Ionic character increases with decreasing polarizing power of the cation. The correct order is $\mathrm{KI}>\mathrm{NaI}>\mathrm{LiI}$.

(v) $\mathrm{AgI}>\mathrm{AgBr}>\mathrm{AgCl}$ (order of solubility in water) - Incorrect. Solubility of silver halides in water decreases with increasing covalent character. The correct order is $\mathrm{AgCl}>\mathrm{AgBr}>\mathrm{AgI}$.

Therefore, 2 statements are correct.