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Most stable complex (chelate effect)

This type of question, asked 2 times: 2021 Paper 15, 5 Apr 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    2021 Paper 15

    37
    Which compound is most stable?

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  2. Question 2

    5 Apr 2026 S2

    36
    Identify the correct statements from the following: (A) [Fe(C2O4)3]3−\left\lbrack Fe\left( C_{2}O_{4} \right)_{3} \right\rbrack^{3 -} is the most stable complex among [Fe(OH)6]3−,[Fe(C2O4)3]3−\left\lbrack Fe(OH)_{6} \right\rbrack^{3 -},\left\lbrack Fe\left( C_{2}O_{4} \right)_{3} \right\rbrack^{3 -} and [Fe(SCN)6]3−\left\lbrack Fe(SCN)_{6} \right\rbrack^{3 -} (B) The stability of [Cu(NH3)4]2+\left\lbrack Cu\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +} is greater than that of [Cu(en)2]2+\left\lbrack Cu(en)_{2} \right\rbrack^{2 +} (C) The hybridization of Fe in K4[Fe(CN)6]K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack is d2sp3d^{2}{sp}^{3} (D) [Fe(NO2)3Cl3]3−\left\lbrack Fe\left( {NO}_{2} \right)_{3}{Cl}_{3} \right\rbrack^{3 -} exhibits linkage isomerism (E) NO2−{NO}_{2}^{-}and SCN−{SCN}^{-}ligands are NOT ambidentate ligands Choose the correct answer from the options given below :

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