IUPAC name of ${\mathrm{H}}_2\left[{\mathrm{PtCl}}_6\right]$ is:

1. hydrogen hexachloroplatinate (IV)

2. dihydrogen hexachloroplatinate (IV)

3. hydrogen hexachloroplatinic (IV) acid

4. hexachloroplatinic (IV) acid

A red precipitate is obtained when an ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II).
Which of the following statements is not true?

1.  Complex has symmetrical H-bonding.
2.  Red complex has a tetrahedral geometry.
3.  Dimethylglyoxime functions as a bidentate ligand.
4.  Red complex has a square planar geometry.

A low spin complex of $d^6$-cation in an octahedral field will have the following energy:

1.   $\frac{-12}{5}{∆}_0+3P$

2.  $\frac{-2}{5}{∆}_0+2P$

3.  $\frac{-2}{5}{∆}_0+P$

4.  $\frac{-12}{5}{∆}_0+P$

(${∆}_0$ = Crystal field splitting energy in an octahedral field, P = Electron pairing energy)

Identify the complex among the following that is not expected to exhibit isomerism:
 

1. [Pt(NH₃)₂Cl₂]

2. [Ni(NH₃)₂Cl₂]

3. [Ni(en)₃]²⁺

4. [Ni(NH₃)₄(H₂O)₂]²⁺

The carbonyl compound with the strongest C-O bond is:

1. Fe(CO)₅

2. [Mn(CO)₆]⁺

3. Cr(CO)₆

4. [V(CO)₆]^-

Among the given complex, the complex having the highest paramagnetic behaviour is:
(At. No. Ti = 22, Cr = 24, Co = 27, Zn = 30)

1. ${\left[\mathrm{Zn}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2+}$

2. ${\left[\mathrm{Ti}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$

3. ${\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$

4. ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$

Indicate the complex ion that shows geometrical isomerism:
1. [Cr(H₂O)₄ Cl₂]⁺
2. [Pt(NH₃)₃ Cl]
3. [Co(NH₃)₆]³⁺
4. [Co(CN)₆]^3-

What is the overall complex dissociation equilibrium constant for the ${\left[\mathrm{Cu}\right({\mathrm{NH}}_3\left)\right]}^{2+}$ ion , given that ${\mathrm{\beta }}_{4 }$for this complex is $2.1 \times {10}^{13}$ ?

$1. 4.7 \times {10}^{-14}$
$2. 3.6 \times {10}^{-12}$
$3. 4.9 \times {10}^{14}$
$4. 5.6 \times {10}^{-13}$

 The most stable complex among the following is:

1. [Fe(H₂O)₆]³⁺     

2. [Fe(NH₃)₆]³⁺       

3. [Fe(C₂O₄)₃]^3–       

4. [FeCl₆]^3–

The oxidation number of Cobalt in K[Co(CO)₄] is :

1. +1       

2. +3         

3. –1         

4. –3