Bonding in Coordination Compounds

Ammonia forms the complex ion  ${[\text{Cu}{({\text{NH}}_{\text{3}})}_{\text{4}}]}^{\text{2}+}$  with copper ions in alkaline solution but not in acidic solution. The probable reason for this is:

Nickel $(\mathrm{Z} = 28)$ combines with a uninegative monodentate ligand ${\mathrm{X}}^{-}$ to form a paramagnetic complex $[{\mathrm{NiX}}_4{]}^{2–}$. The number of unpaired electron/s in nickel and geometry of this complex ion are respectively _____.

If ${\mathrm{Ni}}^{2+}$ is replaced by ${\mathrm{Pt}}^{2+}$ in the complex ${\left[{\mathrm{NiCl}}_2{\mathrm{Br}}_2\right]}^{2-}$, which of the following properties are expected to get changed?
A. Geometry
B. Geometrical isomerism
C. Optical isomerism
D. Magnetic properties

The correct order of the number of unpaired electrons in the given complexes is

(A) $\left[\mathrm{Fe}\right(\mathrm{CN}{)}_6{]}^{3-}$

(B) ${\left[{\mathrm{FeF}}_6\right]}^{3-}$

(C) ${\left[{\mathrm{CoF}}_6\right]}^{3-}$

(D) ${\left[\mathrm{Cr}( \mathrm{oxalate} {)}_3\right]}^{3-}$

(E) $\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$

Choose the correct answer from the options given below:

Which of the following complex is octahedral, diamagnetic and the most stable?

Match List-I with List-II

Choose the correct answer from the options given below:

Which of the following is most stable, diamagnetic and octahedral in shape?

In 20th century, German scientist Werner succeeded in clarifying the structures of the five compounds consisting of platinum, chlorine, and ammonia. Some of the properties of these compounds are shown below in the table.

Predict the shape of each compound.

Determine the hybridisation, geometry and magnetism of the following complex.

${\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{+2}$

Explain the hybridisation of hexammine chromium (III) ion.

Find the maximum number of atoms lying in the one plane for ${\left[\mathrm{Cr}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$.

The shapes of the following coordination complexes are

$\begin{array}{ccc}\mathrm{Ni}{\left(\mathrm{CO}\right)}_4& {\left[\mathrm{CoCl}{\left({\mathrm{NH}}_3\right)}_5\right]}^{2+}& {\left[{\mathrm{PtCl}}_4\right]}^{2-}\\ \mathrm{I}& \mathrm{II}& \mathrm{III}\end{array}$

The structure of which of the following chloro species can be explained on the basis of  $ds{p}^2$ hybridisation?

In ${\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$, the hybridisation of central atom and number of unpaired electron can be respectively

How you can give a geometrical shape for a complex entities by its formula only?

Which of the following compound has tetrahedral geometry?

Which of the following is an outer orbital complex?

The hybridisation of $\mathrm{Fe}$ in ${\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$ is