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High spin versus low spin: when each forms and which complexes are low spin

This type of question, asked 3 times: 22 Jan 2025, 24 Jan 2025, 2 Apr 2025. All 3 questions below, oldest first.

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  1. Question 1

    22 Jan 2025

    117
    Identify the homoleptic complex(es) that is/are low spin. (A) [Fe(CN)5NO]2−\left\lbrack Fe(CN)_{5}NO \right\rbrack^{2 -} (B) [CoF6]3−\left\lbrack CoF_{6} \right\rbrack^{3 -} (C) [Fe(CN)6]4−\left\lbrack Fe(CN)_{6} \right\rbrack^{4 -} (D) [Co(NH3)6]3+\left\lbrack Co\left( NH_{3} \right)_{6} \right\rbrack^{3 +} (E) [Cr(H2O)6]2+\left\lbrack Cr\left( H_{2}O \right)_{6} \right\rbrack^{2 +} Choose the correct answer from the options given below :

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  2. Question 2

    24 Jan 2025

    113
    The conditions and consequence that favours the t2 g 3,eg 1t_{2\text{ }g}\ ^{3},e_{g}\ ^{1} configuration in a metal complex are :

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  3. Question 3

    2 Apr 2025

    40
    Given below are two statements : Statement (I) : In octahedral complexes, when Δo<P\Delta_{o} < P high spin complexes are formed. When Δ0>P\Delta_{0} > P low spin complexes are formed. Statement (II) : In tetrahedral complexes because of Δt<P\Delta_{t} < P, low spin complexes are rarely formed. In the light of the above statements, choose the most appropriate answer from the options given below :

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