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AIIMS 2010
Exam
AIIMS
Year
2010
Subject
Chemistry
Chapter
d and f Block Elements

AIIMS 2010 · Chemistry · d and f Block Elements

Assertion : The degree of complex formation in actinides decreases...

Assertion : The degree of complex formation in actinides decreases in the order M4+>MO22+>M3+>MO2+M^{4+}>\mathrm{MO}_2{ }^{2+}>M^{3+}>\mathrm{MO}_2{ }^{+}. Reason : Actinides form complexes with p-bonding ligands such as alkyl phosphines and thioethers.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. 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 M^{4+}>M_2^{2+}>M^{3+}>M O2+ThehighertendencyofcomplexformationofMO22+ascomparedto\mathrm{O}_{2}^{+} The higher tendency of complex formation of \mathrm{MO}_2^{2+} as compared to M^{3+}isduetohighconcentrationofchargeonmetalatomis due to high concentration of charge on metal atomMinMO22+.in \mathrm{MO}_{2}^{2+}.
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