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1. Name the compound K3[Cr(C2O4)3]

2. Explain on the basis of VB theory that [Ni(CN)4]2- ion with square planar structure is diamagnetic and [Ni(Cl)4]2- ion with tetrahedral structure is paramagnetic.

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1. K3[Cr(C2O4)3] – Potassiumtrioxalatochromate(III)

2. Ni = 1s²2s²2p63s²3p64s²3d²

It is diamagnetic due to absence of unpaired electrons.

∴ Due to presence of unpaired electrons it is paramagnetic.

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