NEET2010Chemistryd and f Block ElementsActual
Assertion : The degree of complex formation in actinides decreases in the order M⁴⁺> MO ₂ ²⁺>M³⁺> MO ₂ ⁺ . Reason : Actinides form complexes with p-bonding ligands such as alkyl phosphines and thioethers.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
B. If both assertion and reason are true but reason is not the correct explanation of assertion
Step-by-step solution
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 M⁴⁺>M₂²⁺>M³⁺>M O ₂⁺ The higher tendency of complex formation of MO ₂²⁺ as compared to M³⁺ is due to high concentration of charge on metal atom M in MO ₂²⁺ .