Identify the correct statement about $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ and $\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$
(a)All Ni-O and Cu-O bond lengths of individual species are equal
(b)Ni-O(equatorial) and Cu-O(equatorial)
(c)All Ni-O bond lengths are equal whereas Cu-O (equatorial) bonds are shorter than CuO (axial) bonds
(d)All Cu-O bond lengths are equal whereas Ni-O(equatorial) bonds are shorter than NiO(axial)bonds
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
[Ni(H₂O)₆]²⁺ (d⁸) is a regular octahedron; [Cu(H₂O)₆]²⁺ (d⁹) is Jahn–Teller elongated, with four short equatorial and two long axial Cu–O bonds.