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Question
The order of energy absorbed which is responsible for the order of complexes:
- [Ni(H2O)2(en)]2+
- [Ni(H2O)4(en)]2+ and
- [Ni(en)3]2+
Options
(C) > (B) > (A)
(C) > (A) > (B)
(B) > (A) > (C)
(A) > (B) > (C)
MCQ
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Solution
(C) > (A) > (B)
Explanation:
The order of energy absorbed depends on ligand field strength. Stronger field ligands cause more d-orbital splitting and higher energy absorption.
- [Ni(en)3]2+ (strongest ligand field, highest energy absorbed)
- [Ni(H2O)2(en)]2+ (mix of strong and weak ligands, moderate energy absorbed)
- [Ni(H2O)4(en)]2+ (mostly weak water ligands, lowest energy absorbed)
Order of energy absorbed: [Ni(en)3]2+ > [Ni(H2O)2(en)]2+ > [Ni(H2O)4(en)]2+
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