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  • Which among the following compounds has the highest melting point?Option: 1 <img alt="\mathrm{CaF}_{2}" src="https://entrancecorner.oncodecogs.com/gi

Which among the following compounds has the highest melting point?

Option: 1

\mathrm{CaF}_{2}


Option: 2

\mathrm{CaCl}_{2}


Option: 3

\mathrm{CaBr}_{2}


Option: 4

\mathrm{CaI}_{2}


Answers (1)

Cation is same in all case while anions are different.

According to Fajans rule, the larger the size of the anion, greater is the covalent character of the ionic bond.

As covalent character increases, melting point decreases, thus order of melting point is:

\mathrm{CaF}_{2}>\mathrm{CaCl}_{2}>\mathrm{CaBr}_{2}>\mathrm{CaI}_{2}

Posted by

Ramraj Saini

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