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(A) The ionic character of halides of a given alkaline earth metal decreases in the order: $MF_2 > MCl_2 > MBr_2 > MI_2$.This is due to the increasing

Vedclass · Accepted Answer

$CaF_2 > CaCl_2 > CaBr_2 > CaI_2$

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(A) The ionic character of halides of a given alkaline earth metal decreases in the order: $MF_2 > MCl_2 > MBr_2 > MI_2$.This is due to the increasing polarizability of the halide ion as the size of the anion increases (Fajans' rule).Greater ionic character corresponds to higher lattice energy and higher melting points.Therefore,the decreasing order of melting points is: $CaF_2 > CaCl_2 > CaBr_2 > CaI_2$.

Which of the following represents the correct decreasing order of the melting points of calcium halides?

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