The geometries of the ammonia complexes of $\mathrm{Ni}^{2+}, \mathrm{Pt}^{2+}$ and $\mathrm{Zn}^{2+}$, respectively, are

(A) octahedral, square planar and tetrahedral

(B) square planar, octahedral and tetrahedral

(C) tetrahedral, square planar and octahedral

(D) octahedral, tetrahedral and square planar

JEE Advanced · 2016 · 22 May 2016 · Paper 2 · Coordination Compounds

The geometries of the ammonia complexes of

Ni^{2 +}, Pt^{2 +}

and

Zn^{2 +}

, respectively, are

Answer: (A)

Ni^{2 +}

forms

[Ni (NH_{3})_{6}]^{2 +}

which is octahedral.

Pt^{2 +}

forms

[Pt (NH_{3})_{4}]^{2 +}

which is square planar (characteristic of

d^{8}

Pt(II)).

Zn^{2 +}

forms

[Zn (NH_{3})_{4}]^{2 +}

which is tetrahedral.

JEE Advanced · 2016 · 22 May 2016 · Paper 2 · Single correct option