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Question

Highest melting point would be of

1.AlCl3

2.LiCl

3.NaCl

4.BeCl2

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Solution

​The explanation for the correct option:

Option(3) NaCl

  • The melting point of ​NaCl is 801oC
  • NaCl is an ionic compound, hence it has high melting and boiling point
  • NaCl is more ionic than others because ionic character depends on the size of cations.
  • As here anions are the same in all compounds, more the size of cation, more the ionic character.
  • Here, Na+ ion is more in size than other ions.

​The explanation for the incorrect option:

(1) AlCl3 - the melting point is 192.4oC

(2) LiCl - the melting point is 605oC

(4) BeCl2 - the melting point is 415oC

Hence, Option(3) NaCl has the highest melting point.


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