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(A) For a complex $MA_{2}B_{2}$ with $sp^{3}$ hybridisation,the geometry is tetrahedral. Tetrahedral complexes of the type $MA_{2}B_{2}$ possess a pla

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$0$ and $0$

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(A) For a complex $MA_{2}B_{2}$ with $sp^{3}$ hybridisation,the geometry is tetrahedral. Tetrahedral complexes of the type $MA_{2}B_{2}$ possess a plane of symmetry,making them optically inactive.Optical isomers $= 0$.For a complex $MA_{2}B_{2}$ with $dsp^{2}$ hybridisation,the geometry is square planar. Square planar complexes are planar and possess a plane of symmetry (the molecular plane itself),making them optically inactive.Optical isomers $= 0$.Thus,the number of optical isomers for both cases is $0$ and $0$.

The number of possible optical isomers for the complexes $MA_{2}B_{2}$ with $sp^{3}$ and $dsp^{2}$ hybridised metal atom,respectively,is.
Note : $A$ and $B$ are unidentate neutral and unidentate monoanionic ligands,respectively.

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The number of possible optical isomers for the complexes $MA_{2}B_{2}$ with $sp^{3}$ and $dsp^{2}$ hybridised metal atom,respectively,is.Note : $A$ and $B$ are unidentate neutral and unidentate monoanionic ligands,respectively.