Question

Highest melting point would be of

$1.AlC{l}_3$

$2.LiCl$

$3.NaCl$

$4.BeC{l}_2$

Explain how

Answer 1

​The explanation for the correct option:

Option(3) $NaCl$

• The melting point of ​$NaCl$ is ${801}^{o}C$
• $NaCl$ is an ionic compound, hence it has high melting and boiling point
• $NaCl$ is more ionic than others because ionic character depends on the size of cations.
• As here anions are the same in all compounds, more the size of cation, more the ionic character.
• Here, $N{a}^{+}$ ion is more in size than other ions.

​The explanation for the incorrect option:

(1) $AlC{l}_3$ - the melting point is ${192.4}^{o}C$

(2) $LiCl$ - the melting point is ${605}^{o}C$

(4) $BeC{l}_2$ - the melting point is ${415}^{o}C$

Hence, Option(3) $NaCl$ has the highest melting point.