Which one of the following has a square planar geometry?
(At. Nos. Co = 27, Ni = 28, Fe = 26, Pt = 78)

1.	[CoCl4]2–	2.	[FeCl4]2–
3.	[NiCl4]2–	4.	[PtCl4]2–

Which of the following pairs represents linkage isomers?

1. [Cu(NH₃)₄] [PtCl₄] and [Pt(NH₃)₄] [CuCl₄]

2. [Pd(PPh₃)₂(NCS)₂) and [Pd(PPh₃)₂(SCN)₂]

3. [Co(NH₃)₅NO₃]SO₄ and [Co(NH₃)₅SO₄]NO₃

4. [PtCl₂(NH₃)₄] Br₂ and [PtBr₂(NH₃)₄]Cl₂

Which of the following compounds shows optical isomerism?

1. [Co(CN)₆]^3-

2. [Cr(C₂O₄)₃]^3-

3. [ZnCl₄]^2-

4. [Cu(NH₃)₄]²⁺

The value of the 'spin only' magnetic moment for one of the following configurations is 2.84 BM. The correct one is:
1. d⁵ (in strong ligand field)
2. d³ (in weak as well as in strong fields)
3. d⁴ (in weak ligand field)
4. d⁴ (in strong ligand field)

Identify the outer orbital complex among the following options.
(Atomic number Mn=25, Fe=26, Co=27, Ni=28)

1. [Fe(CN)₆]^4-

2. [Mn(CN)₆]^4-

3. [Co(NH₃)₆]³⁺

4. [Ni(NH₃)₆]²⁺

The number of EDTA (ethylenediaminetetraacetic acid) molecules that are required to make an octahedral complex with a Ca²⁺ ion is/are: 
1. Six
2. Three
3. One
4. Two

Number of bridging CO ligands in [Mn₂(CO)₁₀] is:

For a ${\mathrm{d}}^4$ metal ion in an octahedral field, the correct electronic configuration is:

The hybridization and magnetic nature of ${\left[\mathrm{Mn}\right(\mathrm{CN}{)}_6]}^{-4}\text{\hspace{0.17em}and\hspace{0.17em}}{\left[\mathrm{Fe}\right(\mathrm{CN}{)}_6]}^{3-}$, respectively are:

1. $\begin{array}{l}{\mathrm{d}}^2{\mathrm{sp}}^3\end{array}$and diamagnetic

2. $\begin{array}{l}{\mathrm{sp}}^3{\mathrm{d}}^2\end{array}$and diamagnetic

3. ${\mathrm{d}}^2{\mathrm{sp}}^3$ and paramagnetic

4.  ${\mathrm{sp}}^3{\mathrm{d}}^2$ and paramagnetic

The stepwise formation of [Cu(NH₃)₄]²⁺ is given below

$\begin{array}{l}{\mathrm{Cu}}^{2+}+{\mathrm{NH}}_3\stackrel{{\mathrm{K}}_1}{\rightleftarrows }{\left[\mathrm{Cu}\left({\mathrm{NH}}_3\right)\right]}^{2+}\\ {\left[\mathrm{Cu}\left({\mathrm{NH}}_3\right)\right]}^{2+}+{\mathrm{NH}}_3\stackrel{{\mathrm{K}}_2}{\rightleftharpoons }{\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_3\right]}^{2+}\\ {\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_2\right]}^{2+}+{\mathrm{NH}}_3\stackrel{{\mathrm{K}}_3}{\rightleftharpoons }{\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_3\right]}^{2+}\\ {\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_3\right]}^{2+}+\mathrm{NH}\stackrel{{\mathrm{K}}_4}{{}_3\rightleftharpoons }{\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}\end{array}$

The value of stability constants K₁, K₂, K₃ and K₄ $\text{\hspace{0.17em}are\hspace{0.17em}}{10}^4,1.58\times {10}^3,5\times {10}^2\text{\hspace{0.17em}and\hspace{0.17em}}{10}^2$ respectively. The overall equilibrium constants for the dissociation of $[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4]$²⁺ is x × 10^–12. The value of x is ________.

(Rounded off to the nearest integer)

1. 2

2. 4

3. 3

4. 1