JEE Main 2026 Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main 2026

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 the light of the above statements, choose the correct answer from the options given below:

Answer: (A)

Solution

IE₃ breaks a stable d¹⁰ (Zn²⁺→Zn³⁺, highest) while Sc²⁺→Sc³⁺ achieves a noble-gas core (lowest); actual values

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Question ID VK-015169