What is the correct order of melting point?

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Question

(A) The melting point of ionic compounds depends on the lattice energy,which is inversely proportional to the interionic distance. For alkaline earth

Vedclass · Accepted Answer

$BeO > MgO > CaO > SrO$

Vedclass · Answer

(A) The melting point of ionic compounds depends on the lattice energy,which is inversely proportional to the interionic distance. For alkaline earth metal oxides $(BeO, MgO, CaO, SrO)$,as the size of the cation increases down the group,the lattice energy decreases,leading to a decrease in the melting point. Thus,the order $BeO > MgO > CaO > SrO$ is correct. In option $B$,the order is incorrect because $CaCl_2$ has a higher melting point than $SrCl_2$. In option $C$,the order is incorrect as $Al_2O_3$ has the highest melting point due to high lattice energy.

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