• # question_answer The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, ${{K}^{+}},C{{a}^{2+}},M{{g}^{2+}},B{{e}^{2+}}$? A)  $M{{g}^{2+}}<B{{e}^{2+}}<{{K}^{+}}<C{{a}^{2+}}$ B)  $B{{e}^{2+}}<{{K}^{+}}<C{{a}^{2+}}<M{{g}^{2+}}$ C)  ${{K}^{+}}<C{{a}^{2+}}<M{{g}^{2+}}<B{{e}^{2+}}$ D)  $C{{a}^{2+}}<M{{g}^{2+}}<B{{e}^{2+}}<{{K}^{+}}$

Higher the charge/size ratio, more is the polarising power. Hence, the order of polarising power is ${{K}^{+}}<C{{a}^{2+}}<M{{g}^{2+}}<B{{e}^{2+}}$