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21 July, 03:57

Would you expect the Mg3[Cr (CN) 6]2 to be diamagnetic or paramagnetic? Explain your reasoning.

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  1. 21 July, 04:09
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    paramagnetic

    Explanation:

    The complex ion is : [Cr (CN) ₆]³⁻

    Oxidation state of Cr in [Cr (CN) ₆]³⁻ is:

    x + (-1) 6 = - 3

    x = + 3

    CN⁻ is a strong field ligand which can result in pairing of the electrons.

    The electronic configuration of Cr is:

    1s²2s²2p⁶3s²3p⁶3d⁵4s¹

    The electronic configuration of Cr³⁺ is:

    1s²2s²2p⁶3s²3p⁶3d³

    These 3 electrons will be singly present in the 3 degenerate t₂g orbitals and per Hund's rule, pairing will not occur in the same level energy orbitals. So, no. of unpaired electrons will be 3 and the complex will be paramagnetic.
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