MCQs

Coordination Compounds


1.      Which of the following compounds formed by Cu2+ ions is most stable?

(a) Cu2+ + 4NH3 → [Cu(NH3)4]2+; Log K = 11.6

(b) Cu2+ + 4CN– → [Cu(CN)4]2–; Log K = 27.3

(c) Cu2+ + 2 en → [Cu(en)2]2+; Log K = 15.4

(d)  Cu2+ + 4H2O → [Cu(H2O)4]2+; Log K = 8.9


2. The colour of the coordination, compounds depend on the crystals field splitting. What will be the correct order of absorption of wave length of light in the visible region? for the complexes [CO(NH3)6 ]3+; [CO(CN)6 ]3–; [CO(H2O)6]3+.

(a) [CO (CN)6]3– > [CO(NH3)6]3+ > [CO(H2O)6]3+

(b) [CO (NH3)6]3+ > [CO(H2O)6]3+ > [CO(CN)6]3–

(c) [CO (H2O)6]3+ > [CO(NH3)6]3+ > [CO(CN)6]3–

(d) [CO (CN)6]3– > [CO(NH3)6]3+ > [CO(H2O)6]3+


3. When 0.1 mol COCl3 (NH3)5 is treated with an excess of AgNO3; 0.2 mol of AgCl are obtained. The conductivity of the solution will correspond to.

(a)   1:3 electrolyte                                           (b) 1 : 2 electrolyte

(c)  1 : 1 electrolyte                                        (d) 3 : 1 electrolyte


4. The correct IUPAC name of [Pt(NH3)2 Cl2] is

(a)   Diamminedichloridoplatinum (II)

(b)   Diamminedichlorideplatinum (IV)

(c)   Diamminedichlorideplatinum (0)

(d)   Dimminedichlorideplatinum (IV)


5. This stabilization of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?

(a)   [Fe (CO)5 ]                                              (b) [Fe(CN)6 ]3–

(c)   [Fe(C2O4)3]3+                                          (d) [Fe(H2O)6 ]3+


6. Indicate the complex ion which shows geometrical isomerism.

(a)   [Cr(H2O)4Cl2]+                                          (b) [Pt(NH3)3Cl]

(c)   [Pt(NH3)6]3+                                            (d) [CO(CN)5(NC)]3–

 

 7.  The CFSE for octahedral [CaCl6]4– is 18,000 cm–1. The CFSE for tetrahedral [COCl6]2– will be:

(a) 18,000 cm–1                                               (b) 16,000 cm–1

(c) 8,000 cm–1                                                 (d) 20,000 cm–1

 

8. Due to the presence of ambidentate ligands coordination compounds shows isomerism. Palladium complexes of the type [Pd(C6H5)2(SCN)2] and [Pd(C6H5)2 (NCS)2] are:

(a)   Linkage isomers.                                       (b) Coordination isomers

(c)  Ionisation isomers                                   (d) Geometrical isomers


9.  The compounds [CO(SO4)(NH3)5 Br and [CO(SO4) (NH3)5] Cl represents.

(a)   Linkage isomerism                                    (b) Ionization isomerism

(c)  Coordination isomerism                          (d) No isomerism


10.  Which of the following species is not impacted to be a ligand?

(a)   NO                                                              (b) NH4+

(c)  NH2CH2NH2                                            (d) CO

11.  What kind of isomerism exist between [Cr (H2O)6] Cl3 (violet) and

[Cr(H2O)5Cl] Cl2 . H2O (greyish-green)?

(a)   Linkage isomerism                                    (b) Solvate isomerism

(c)  Ionisation isomerism                               (d) Coordination isomerism


12.  IUPAC name of [Pt(NH3)2Cl(NO2)] is:

(a)   Platinum diaminechloritrite

(b)   Chloronitrito-N-ammine platinum(II)

(c)   Diamminechloridonitrite-N-platinum (II)

(d)   Diamminechlornitrite-N-platinate(II)


13.  Atomic number of Mn, Fe, and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?

(a) [CO(NH3)6]3+                                           (b) [Mn(CN)6]3–

(c) [Fe(CN)6]4–                                               (d) [Fe(CN)6]3–


14.  Which of the following options are correct for [Fe(CN)6]3– complex?

(a)   d2sp3 hybridisation                                    (b) sp3d2 hybridisation

(c)  paramagnetic                                           (d) diamagnetic


15.  Identify the optically active compounds from the following:

(a)   [CO(en)3]3+                                               (b) trans [CO(en)2Cl2]+

(c)  Cis [CO[en)2Cl2]+                                   (d) [Cr(NH3)5Cl]


16.  Match the complex ions given in column 1 with the hybridisation and number of unpaired electrons given in column 2 and assign the correct code.

Column 1                                                             Column 2

(A) [Cr(H2O)6]3+                                           (1) dsp2; 1

(B) [CO(CN)4]2–                                            (2) sp3d2; 5

(C)  [Ni(NH3)6]2+                                            (3) d2sp3; 3

(D) [MnF6]4–                                                  (4) sp3; 4

                                                                        (5) sp3d2; 2

(a)   A–3, B–1, C–5, D–2                                (b)  A–4, B–3, C–2, D–1

(c)   A–3, B–2, C–4, D–1                                (d)  A–4, B–1, C–2, D–3


17.  Match the complex species given in column 1 with the possible  isomerism given in column 1 and assign the correct code:

 

Column 1

 

Column 2

(A) [CO(NCS) (NH3)5] (SO3)

(1)

+ 4

(B) [CO(NH3)4 Cl2] SO4

(2)

0

(C) [CO (S2O3)3] Na4

(3)

+ 1

(D) [CO2(CO)8]

(4)

+ 2

 

(5)

+ 3

(a) A–1, B–2, C–4, D–5

(b)

A–4, B–3, C–2, D–1

(c) A–5, B–1, C–4, D–2

(d)

A–4, B–2, C–2, D–3

 

 

 

 

 

 

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choice.

(a)   Both assertion and reason are True, and reason is the correct explanation of the assertion.

(b)   Both assertion and reason are True, but reason is not the correct explanation of the assertion.

(c)   Assertion is True, but reason is False.

(d) Both assertion and reason are False.


18.  Assertion: Toxic metal ions are removed by the chelating ligands.

Reason: Chelate complexes tend to be move stable.


19.  Assertion: [(Fe(CN)6]3– ion shows magnetic moment corresponding to two

unpaired electrons.

Reason: Because it has d2sp3 type hybridisation.