Which of the following compounds has the lowest melting point?

Which of the following compounds has the lowest melting point?
  1. $\mathrm{CaBr}_2$
  2. $\mathrm{CaI}_2$
  3. $\mathrm{CaF}_2$
  4. $\mathrm{CaCl}_2$

Solution

As covalent character increases, melting point decreases, thus order of melting point is $\mathrm{CaF}_2 > \mathrm{CaCl}_2 > \mathrm{CaBr}_2 > \mathrm{CaI}_2$

Asked in: NEET 2011 (Screening)

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