JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
Given below are two statements:
Statement I: Among \(Zn, Mn, Sc\) and \(Cu\), the energy required to remove the third valence electron is highest for \(Zn\) and lowest for \(Sc\).
Statement II: The correct order of the following complexes in terms of CFSE is \([Co(H_2 O)_6]^{2+} < [Co(H_2 O)_6]^{3+} < [Co(en)_3]^{3+}\).
In the light of the above statements, choose the correct answer from the options given below:
- A Both Statement I and Statement II are true
- B Both Statement I and Statement II are false
- C Statement I is true but Statement II is false
- D Statement I is false but Statement II is true
Answer & Solution
Correct Answer
(A) Both Statement I and Statement II are true
Step-by-step Solution
Detailed explanation
Statement I: The third ionization energy (\(IE_3\)) corresponds to the removal of the third valence electron. Let us look at the electronic configurations of the divalent cations for the given metals: \(Sc^{2+}\): \([Ar] 3d^{1}\) \(Mn^{2+}\): \([Ar] 3d^{5}\) \(Cu^{2+}\):…
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