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Which of the following statements about the complex $[Cr {({NH}_{3})}_{6}] {Cl}_{3}$ %· is wrong ?

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The complex involves $d^{2} s p^{3}$ hybridization and is therefore has an octahedral geometry

The complex is paramagnetic

The complex is diamagnetic

The primary valencies of Cr are 3 and its secondary valencies are 6

answer is C.

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Detailed Solution

The complex [Cr(NH3)−6]Cl3 involved d2sp3 hybridization as it involves (n−1)d orbitals for hybridization. It is an inner orbital complex.

The d-orbital involved in hybridization belongs to the penultimate shell due to the presence of strong ligand.

The complex is paramagnetic since ${Cr}^{3 +}$ contains unpaired electrons.

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