Which one of the following are covalent and ionic ? CaF2, HBr, H2S, CaCl2
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Answer:
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:
CaF
2
>CaCl
2
>CaBr
2
>CaI
2
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