1.

The correct order of increasing ionic character is(a) BeCl2 < MgCl2 < CaCl2 < BaCl2(b) BeCl2 < MgCl2 < BaCl2 < CaCl2(c) BeCl2 < BaCl2 < MgCl2 < CaCl2(d) BaCl2 < CaCl2 < MgCl2 < BeCl2

Answer»

Answer is : (a) BeCl2 < MgCl2 < CaCl2 < BaCl2

The ionic character is decided by Fajan’s rule. According to this rule, larger is size of cation, smaller the size of the anion and lesser is the charge on the cation or high, thus more will be the ionic character. As the anion and charge of n the cation in all the given compounds are same. So, the ionic character is only dependent on the size of cation. As the size of cation increases in the order

Be2+ < Mg2+ < Ca2+ < Ba2+

∴ The ionic character will also increase in the same manner, i.e.

BeCl2 < MgCl2 < CaCl2 < BaCl2



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