A) \[{{M}^{4+}}>{{M}^{3+}}>MO_{2}^{2+}>MO_{2}^{+}\]
B) \[MO_{2}^{+}>MO_{2}^{2+}>{{M}^{3+}}>{{M}^{4+}}\]
C) \[M_{{}}^{4+}>MO_{2}^{2+}>{{M}^{3+}}>MO_{2}^{+}\]
D) \[MO_{2}^{2+}>MO_{2}^{+}>M_{{}}^{4+}>{{M}^{3+}}\]
Correct Answer: C
Solution :
[c]: The higher the charge on the metal ion, smaller is the ionic size and more is the complex forming ability. Thus, the degree of complex formation decreases in the order \[{{M}^{4+}}>MO_{2}^{2+}>{{M}^{3+}}>MO_{2}^{+}\] The higher tendency of complex formation of \[MO_{2}^{2+}\]as compared to \[{{M}^{3+}}\] is due to high concentration of charge on metal atom M in \[MO_{2}^{2+}\].
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