Complexes (ML_5) of metals Ni and Fe have ide | vedclass

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(B) $1$. For a square pyramidal geometry $(ML_5)$ (e.g.,$Ni$ complex): - There are $8$ angles of $90^{\circ}$ (between the axial ligand and the four b

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$20$

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(B) $1$. For a square pyramidal geometry $(ML_5)$ (e.g.,$Ni$ complex): - There are $8$ angles of $90^{\circ}$ (between the axial ligand and the four basal ligands,and between adjacent basal ligands). - There are $2$ angles of $180^{\circ}$ (between the axial ligand and the opposite basal ligand,and between opposite basal ligands). - Total angles for square pyramidal = $8 + 2 = 10$. $2$. For a trigonal bipyramidal geometry $(ML_5)$ (e.g.,$Fe$ complex): - There are $6$ angles of $90^{\circ}$ (between axial and equatorial ligands). - There are $3$ angles of $120^{\circ}$ (between equatorial ligands). - There are $1$ angle of $180^{\circ}$ (between the two axial ligands). - Total angles for trigonal bipyramidal = $6 + 3 + 1 = 10$. $3$. Sum of all specified angles = $10 + 10 = 20$.

Complexes $(ML_5)$ of metals $Ni$ and $Fe$ have ideal square pyramidal and trigonal bipyramidal geometries,respectively. The sum of the $90^{\circ}$,$120^{\circ}$ and $180^{\circ}$ $L-M-L$ angles in the two complexes is

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