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Which of the following complexes is correctly matched with their geometries?

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${[Co (py)_{4}]}^{2 +}$ square planar

${[Cu ({CN}_{4})]}^{3 -}$ tetrahedral

${[Fe (CO)_{4}]}^{2 -}$ tetrahedral

All of these

answer is D.

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Detailed Solution

Since ${[Cu ({CN}_{4})]}^{3 -}$ and ${[Fe (CO)_{4}]}^{2 -}$ are ${sp}^{3}$ hybridized they are tetrahedral. While ${[Co (py)_{4}]}^{2 +}$ is ${dsp}^{2}$ hybridized they are square planner.

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