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Q.

Which of the following chemical species is tetrahedral, diamagnetic as well as coloured?

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a

${MnO}_{4}^{2 -}$

b

${[{NiCl}_{4}]}^{2 -}$

c

${[Ni (CN)_{4}]}^{2 -}$

d

${CrO}_{4}^{2 -}$

answer is A.

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Detailed Solution

Due to LMCT phenomenon ${CrO}_{4}^{2 -}$ is diamagnetic as well as colored and due to SP³hybridization they are tetrahedral.

Hence, option A is correct.

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