Multiple choice

Which of the following relations is true regarding the higher melting point?

  1. CuCl < KCl

  2. SnCl2 < SnCl4

  3. CuCl > KCl .

  4. NaI > KCl .

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A Correct answer
Explanation

The electronic configuration of Cu is given by  - 3d10 4s1 , therefore Cu+ has 3d10 4s0 . The electronic configuration of K is given by  - 4s1 3d0 . and therefore K+ has  4s0 3d0 . In Cu pseudo noble gas configuration is there because of this ionic potential of of Cu increases. It has more covalent character . Hence, less melting point . 

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