JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
Arrange the following metal complex / compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers \(Ce =58, Gd =64\) and \(Eu =63 .)\) \((a)\) \(\left( NH _{4}\right)_{2}\left[ Ce \left( NO _{3}\right)_{6}\right]\) \((b)\) \(Gd \left( NO _{3}\right)_{3}\) and \((c)\) \(Eu \left( NO _{3}\right)_{3}\) Answer is :
- A \((b) < (a) < (c)\)
- B \((c) < (a) < (b)\)
- C \((a) < (b) < (c)\)
- D \((a) < (c) < (b)\)
Answer & Solution
Correct Answer
(D) \((a) < (c) < (b)\)
Step-by-step Solution
Detailed explanation
\((a)\) \({ }_{58} Ce \rightarrow[ Xe ] 4 f ^{2} 5 d ^{0} 6 s ^{2}\) In complex \(Ce ^{4+} \rightarrow[ Xe ] 4 f ^{0} 5 d ^{0} 6 s ^{0}\) there is no unpaired electron so \(\mu_{ m }=0\) \((b)\) \({ }_{64} Gd ^{3+} \rightarrow[ Xe ] 4 f ^{7} 5 d ^{0} 6 s ^{\circ}\) contain seven…
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