Question

Give reason for the following:

(a) LiCl is more covalent than KCl.

(b) LiF has lower melting point than NaCl.

 (c) CuCl is more covalent than NaCl.

Answer 1

(a) Due to smaller size and high poalrising power of Li+ ion ,LiCl is more covalent than KCl. 

(b) Small cation Li+ ion highly polarizes large anion I^-, LiI is more covalent and hence has lower melting point. 

(c) Due to pseudo inert gas configuration, Cu⁺ is more polarizing than Na⁺ and hence CuCl is more Covalent NaCl.