Given below are two statements:
Statement I: High spin complexes have high values of .
Statement II: Low spin complexes are formed when is high.
In the light of the above statements, choose the most appropriate answer from the options given below:
Both Statement I and Statement II are correct
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is correct
Both Statement I and Statement II are incorrect
Correct answer:D
Standard Method
Given: Two statements about high spin and low spin complexes in terms of .
Find: Which statement is correct.
From Crystal Field Theory:
Here is the pairing energy.
So, Statement I is incorrect because high spin complexes are associated with low values of , not high values.
Statement II is correct because low spin complexes are formed when is high.
The solution marks option D, but its written explanation corresponds to a different question and conflicts with the given statements and options. Based on the actual statements in the question, the defensible choice is C.
Therefore, the correct option is C.
Assuming high spin complexes form when is high. This is wrong because a large splitting energy favors pairing of electrons. Instead, remember that high spin forms when .
Ignoring the comparison between crystal field splitting and pairing energy. This is wrong because spin state depends on versus , not on alone. Always compare the two energies first.
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