Question

Considering greater polarization in $LiCl$ compared to that of $NaCl$, which of the following statements you would expect to be correct ?

• A. $LiCl$ has lower melting point than that of $NaCl$
• B. $LiCl$ dissolves more in organic solvents
• C. $LiCl$ will ionize in water more than $NaCl$
• D. LiCl is more covalent than NaCl

Answer 1

Answer: (A), (B), (D)

The correct options are
A $LiCl$ has lower melting point than that of $NaCl$
B $LiCl$ dissolves more in organic solvents
D LiCl is more covalent than NaCl

According to Fajan's rules, higher the polarization, higher is the covalent character.
(i) Covalent compound have lower melting point than ionic thus
$LiCl$ being more covalent than $NaCl$ has lower melting point than that of $NaCl.$
(ii) Covalent compounds dissolve more in organic non polar solvent than ionic thus $LiCl$ dissolves more in organic solvents.
(iii) Covalent compounds will ionise less than ionic in water
Since, $LiCl$ is covalent while $NaCl$ is ionic. As a result, $LiCl$ will not ionize in water more than $NaCl$.
(iv) Due to high polarisation in LiCl, it has more covalent character than NaCl
Hence , correct options are A, B ,D