Alkaline earth metals

Question

Which is not the correct variation of the property indicated of chlorides of alkaline earth metals?

Moderate

Solution

By Fajan's rule,

smaller the cation,

larger the anion,

larger the charge,

presence of d- and f-electrons,

then larger the polarisation of the cation by anion and vice-versa.

Thus, covalent nature increases, melting point decreases, lattice

energy increases and thermal stability increases

$\text{Size}{\mathrm{Be}}^{2+}{\mathrm{Mg}}^{2+}{\mathrm{Ca}}^{2+}{\mathrm{Ba}}^{2+}$ (anion is common)

Thus, BeCI_{2}, has maximum covalent nature and has least melting point.

BeCl_{2 }has maximum lattice energy and has maximum thermal stability.

Thus (a) is incorrect, (b) is correct, (c) is correct, (d) is correct.

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Download Now