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According to Fajans'rules, the percentag...

According to Fajans'rules, the percentage of covalent character in an ionic compound increase if the cation is highly charged or small in size and the anion is large or cation has pseudoinert gas configuration. As a result of the increased covalent character, solubility in less polar solvent increases and the melting point decreases.
Which of the following has highest melting point?

A

`LiCl`

B

`NaCl`

C

`KCl`

D

`RbCl`

Text Solution

Verified by Experts

The correct Answer is:
D
`LiCl` being covalent will have lowest melting point. Among the remaining options, `NaCl` has highest lattice enthalpy and thus have highest melting point.
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According to Fajans'rules, the percentage of covalent character in an ionic compound increase if the cation is highly charged or small in size and the anion is large or cation has pseudoinert gas configuration. As a result of the increased covalent character, solubility in less polar solvent increases and the melting point decreases. Which of the following has the lowest melting point?

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