Q 1 :

The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and M is metal) involves ${\mathrm{sp}}^3$ hybridization. The number of geometrical isomers exhibited by the complex is:                                         [2024]

• 3

   

• 0

   

• 4

   

• 2

   

Q 2 :

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): The total number of geometrical isomers shown by ${\left[\text{Co(}\mathrm{en}{\text{)}}_2{\text{Cl}}_2\right]}^{+}$ complex ion is three.

Reason (R): ${\left[\text{Co(}\mathrm{en}{\text{)}}_2{\text{Cl}}_2\right]}^{+}$ complex ion has an octahedral geometry.

In the light of the above statements, choose the most appropriate answer from the options given below:                           [2024]

• (A) is correct but (R) is not correct.

   

• Both (A) and (R) are correct and (R) is the correct explanation of (A).

   

• (A) is not correct but (R) is correct.

   

• Both (A) and (R) are correct but (R) is not the correct explanation of (A).

   

Q 3 :

Number of complexes which show optical isomerism among the following is _____.                        [2024]

$\text{Cis}-{\left[\text{Cr}{\left(\text{ox}\right)}_2{\text{Cl}}_2\right]}^{3-},{\left[{\text{Co(en)}}_3\right]}^{3+},\text{cis}-{\left[{\text{Pt(en)}}_2{\text{Cl}}_2\right]}^{2+},\text{cis}-{\left[{\text{Co(en)}}_2{\text{Cl}}_2\right]}^{+},\text{trans}-{\left[{\text{Pt(en)}}_2{\text{Cl}}_2\right]}^{2+},\text{trans}-{\left[\text{Cr}{\left(\text{ox}\right)}_2{\text{Cl}}_2\right]}^{3-}$

Q 4 :

Given below are two statements:

Statement I: A homoleptic octahedral complex, formed using monodentate ligands, will not show stereoisomerism.

Statement II: cis- and trans- platin are heteroleptic complexes of Pd.

In the light of the above statements, choose the correct answer from the options given below.             [2025]

• Both statement I and Statement II are false.

   

• Statement I is false but Statement II is true.

   

• Both statement I and Statement II are true.

   

• Statement I is true but Statement II is false.

   

Q 5 :

An octahedral complex having molecular composition $\mathrm{Co}.5{\mathrm{NH}}_3.\mathrm{Cl}.{\mathrm{SO}}_4$ has two isomers A and B. The solution of A gives a white precipitate with ${\mathrm{AgNO}}_3$ solution and the solution of B gives a white precipitate with ${\mathrm{BaCl}}_2$ solution. The type of isomerism exhibited by the complex is:       [2025]

• Co-ordinate isomerism

   

• Linkage isomerism

   

• Ionisation isomerism

   

• Geometrical isomerism

   

Q 6 :

Number of stereoisomers possible for the complexes, $\left[{\mathrm{CrCl}}_3{\text{(py)}}_3\right]$ $\mathrm{and}$${\text{[CrCl}}_2{\text{(ox)}}_2{\text{]}}^{3-}$ are respectively

(py = pyridine, ox = oxalate)                           [2025]

• 3 and 3

   

• 2 and 2

   

• 2 and 3

   

• 1 and 2

   

Q 7 :

The complex that shows Facial–Meridional isomerism is:            [2025]
 

• ${\left[\mathrm{Co}{\left(\mathrm{en}\right)}_3\right]}^{3+}$

   

• $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\mathrm{Cl}}_3\right]$

   

• ${\left[\mathrm{Co}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]}^{+}$

   

• ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]}^{+}$

   

Q 8 :

The number of optical isomers exhibited by the iron complex (A) obtained from the following reaction is _________.

${\text{FeCl}}_3+\text{KOH}+{\text{H}}_2{\text{C}}_2{\text{O}}_4\to A$                        [2025]
 

Q 9 :

A metal complex with a formula ${\mathrm{MCl}}_4.3{\mathrm{NH}}_3$ is involved in ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybridisation. It upon reaction with excess of ${\mathrm{AgNO}}_3$ solution gives ‘$x$’ moles of AgCl. Consider ‘$x$’ is equal to the number of lone pairs of electron present in central atom of ${\mathrm{BrF}}_5$.

Then the number of geometrical isomers exhibited by the complex is _______.           [2025]

Q 10 :

Chiral complex from the following is: 

Here en = ethylenediamine                                      [2023]

• cis - $\left[{\mathrm{PtCl}}_2{\left({\mathrm{NH}}_3\right)}_2\right]$

   

• trans - ${\left[{\mathrm{PtCl}}_2{\left(\mathrm{en}\right)}_2\right]}^{2+}$

   

•  trans - ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]}^{+}$

   

• cis - ${\left[{\mathrm{PtCl}}_2{\left(\mathrm{en}\right)}_2\right]}^{2+}$

   

Q 11 :

The $\mathrm{Cl}-\mathrm{Co}-\mathrm{Cl}$ bond angle values in fac - $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\mathrm{Cl}}_3\right]$ complex is/are:              [2023]

• $180°$

   

• $90°$

   

• $90°$ & $180°$

   

• $90°$ & $120°$

   

Q 12 :

The complex cation which has two isomers is:                [2023]

• ${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$

   

• ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Cl}\right]}^{+}$

   

• ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{NO}}_2\right]}^{2+}$

   

• ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Cl}\right]}^{2+}$

   

Q 13 :

Which of the following complex has a possibility to exist as meridional isomer?                      [2023]

• $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\left({\mathrm{NO}}_2\right)}_3\right]$

   

• $\left[\mathrm{Co}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]$

   

• $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2{\mathrm{Cl}}_2\right]$

   

• $\left[\mathrm{Co}{\left(\mathrm{en}\right)}_3\right]$

   

Q 14 :

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?          [2023]

(A) Geometry

(B) Geometrical isomerism

(C) Optical isomerism

(D) Magnetic properties

• B and C

   

• A, B and D

   

• A and D

   

• A, B and C

   

Q 15 :

The total number of stereoisomers for the complex ${\left[\mathrm{Cr}{\left(\mathrm{ox}\right)}_2\mathrm{ClBr}\right]}^{3-}$ (where $\mathrm{ox}$ = oxalate) is:                   [2023]

• 4

   

• 1

   

• 2

   

• 3

   

Q 16 :

X is the number of geometrical isomers exhibited by $\left[\mathrm{Pt}\left({\mathrm{NH}}_3\right)\left({\mathrm{H}}_2\mathrm{O}\right)\mathrm{BrCl}\right].$

Y is the number of optically inactive isomer(s) exhibited by ${\left[{\mathrm{CrCl}}_2{\left(\mathrm{ox}\right)}_2\right]}^{3-}$.

Z is the number of geometrical isomers exhibited by $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\left({\mathrm{NO}}_2\right)}_3\right]$

The value of X+Y+Z  is ______.      [2026]