Question:
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(H₂O)₆]²⁺<[Co(H₂O)₆]³⁺<[Co(en)₃]³⁺.
In light of the above statements, choose the correct answer from the options given below:
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(H₂O)₆]²⁺<[Co(H₂O)₆]³⁺<[Co(en)₃]³⁺.
In light of the above statements, choose the correct answer from the options given below:
Statement II: The correct order of the following complexes in terms of CFSE is [Co(H₂O)₆]²⁺<[Co(H₂O)₆]³⁺<[Co(en)₃]³⁺.
In light of the above statements, choose the correct answer from the options given below:
Updated On: Apr 10, 2026
- Both Statement I and Statement II are true.
- Both Statement I and Statement II are false.
- Statement I is true but Statement II is false.
- Statement I is false but Statement II is true.
Show Solution
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The Correct Option is C
Solution and Explanation
Statement I is correct. The energy required to remove the third valence electron is highest for Zn and lowest for Sc, based on their electronic configuration and periodic trends.
Statement II is false. The correct order of the given complexes in terms of CFSE is: [Co(H₂O)₆]²⁺<[Co(en)₃]³⁺<[Co(H₂O)₆]³⁺. This is because en (ethylenediamine) is a stronger ligand than H₂O, leading to a higher CFSE for the complex [Co(en)₃]³⁺.
Final Answer: (C) Statement I is true but Statement II is false.
Statement II is false. The correct order of the given complexes in terms of CFSE is: [Co(H₂O)₆]²⁺<[Co(en)₃]³⁺<[Co(H₂O)₆]³⁺. This is because en (ethylenediamine) is a stronger ligand than H₂O, leading to a higher CFSE for the complex [Co(en)₃]³⁺.
Final Answer: (C) Statement I is true but Statement II is false.
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