The complex $[Pt(NH_3)_4]^{2+}$ has $.....$ structure.

Which of the following complexes is an outer orbital complex?

The magnetic moment for two complexes of empirical formula $Ni(NH_3)_4(NO_3)_2 \cdot 2H_2O$ is $0$ and $2.84 \ BM$ respectively. The second complex is not a neutral complex. The correct formula and geometry of the first complex is:

Which of the following statements are true about $[CoF_6]^{3-}$ ion?
$I$. The complex has octahedral geometry.
$II$. Coordination number of $Co$ is $3$ and oxidation state is $+6$.
$III$. The complex is $sp^3d^2$ hybridised.
$IV$. It is a high spin complex.

Define the following term: Coordination polyhedron.

$FeSO_4$ is a very good absorber for $NO$. The new compound formed by this process is found to contain what number of unpaired electrons?