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Published on: 13/08/2019
Coordination Compounds
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Questions + Answers key
Take MCQ Chemistry Test
1.
(i) What is the basis of formation of the spectrochemical series?
(ii) Draw the structures of geometrical isomers of the following coordination complexes: [Co(NH3)3Cl3] and [CoCl2)(en2)]+
(where en = ethylene diamine and atomic no. of Co is 27).
2.
What do you understand by stepwise stability constant and overall stability constant of a coordination compound? How are these two constants related?
3.
The value of n in the carbonyl \({ \left( CO \right) }_{ n }-Co-Co-(Co)_n\) is
4
5
6
8
4.
[Cr(H2O)6]Cl3 (at.no. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is
\({ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ xz }^{ 1 }\)
\({ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ z ^2}^{ 1 }\)
\({ 3d }_{ (x^2-y^2)}^{ 1 },{ 3d }_{ z^2 }^{ 1 },{ 3d }_{ xz }^{ 1 }\)
\({ 3d }_{ xy}^{ 1 },{ 3d }_{ (x^2-y^2) }^{ 1 },{ 3d }_{ yz }^{ 1 }\)
5.
Among the following complexes (K-P) K3[Fe(CN)6] (K), [Co(NH3)6]Cl3 (L), Na3[Co(oxalate)3](M), [Ni(H2O)6]Cl2 (N), K2[Pt(CN)4] (O) and [Zn(H2O)6] (NO3)2 (P) the diamagnetic complexes are
K, L, M, N
K, M, O, P
L, M, O, P
L, M, N, O
6.
Which of the following complex exhibits the highest paramagnetic behaviour?
[V(gly)2(OH)2(NH3)2]+
[Fe(en)(bpy)(NH3)2]2+
[Co(OX)2(OH)2]2-
[Ti(NH3)6]3+
7.
The correct statement with respect to the complexes Ni(CO)4 and [Ni(CN)4]2- is
nickel is in the same oxidation state in both
both have tetrahedral geometry
have square planar and tetrahedral geometry respectively
have tetrahedral and square planar geometry respectively
UnAvailable Option
8.
When 0.01 mole of a cobalt complex is treated with excess silver nitrate solution, 4.305 g silver chloride is precipitated. The formula of the complex is
[Co(NH3)3Cl3]
[Co(NH3)5Cl]Cl2
[Co(NH3)6]Cl3
[Co(NH3)4Cl2]NO3
[Co(NH3)4Cl2]Cl
9.
The most stable complex among the following is
K3[Al(C2O4)3]
[Pt(en)2] Cl2
[Ag(NH3)2] Cl
K2[Ni(EDTA)]
10.
IUPAC name of [Pt(NH3)3Br(NO2)Cl]Cl is
Triamminechloridobromidonitroplatinum (IV) chloride
Triamminebromidonitrochloridoplatinum (IV) chloride
Triamminebromidochloridonitroplatinum (IV) chloride
Triamminenitrochloridobromidoplatinum (IV) chloride
11.
Which one of the following is a tridentate ligand?
NO-2
oxalate ion
glycinate ion
dien
12.
In a tetrahedral crystal field, the d-orbitals split into ................ orbitals collectively called ............. and ............. orbitals collectively called ..............
13.
\([Co_2(CO)_8]\)
14.
\(Na_4[Co(S_2O_3)_3]\)
15.
[Ti(H2O)6]3+
16.
[Co(NH3)5Cl] Cl2
17.
d5
18.
What is crystal field splitting energy (CFSE) ?
19.
What type of isomerism is shown by the following complexes ?
(i) \([Cr(en)_3]^{3+}\)
(ii) \([Pt(NH_3)_4]\ [PtCl_4]\)
\(\)
1.
For [Co(NH)3)3CI3]lrefer to solution 40 (iii). Topic 1 subpart. For [Co(en)2Cl2]+ refer to Topic 1 solution 39(iii) subpart.
2.
Complexes are formed from aqueous solution and the reaction involves the replacement of water molecules by the ligands in various steps, each step having its formation constant, e.g.
[CU(H2O)4]SO4 + 4NH3 \(\overset { K }{ \rightleftharpoons } \) [Cu(NH3)4]SO4 + 4H2O
1st step: [CU(H2O)4]SO4 + NH3 \(\overset { { K }_{ 1 } }{ \rightleftharpoons } \) [CU(H2O)3NH3] SO4 + H2O
2nd step: [Cu(H2O)3NH3]SO4 + NH3 \(\overset { { K }_{ 2 } }{ \rightleftharpoons } \) [CU(H2O)2(NH3)2] + H2O
3rd step: [CU(H2O)2(NH3)2]SO4 + NH3 \(\overset { { K }_{ 3 } }{ \rightleftharpoons } \) [Cu(H2O)(NH3)3] + H2O
4th step: [Cu(H2O)(NH3)3]SO4 + NH3 \(\overset { { K }_{ 4 } }{ \rightleftharpoons } \) [Cu(NH3)4]SO4 + H2O
K= k1 x k2 x k3 x k4
3.
(a)
4
4.
(a)
\({ 3d }_{ xy }^{ 1 },{ 3d }_{ yz }^{ 1 },{ 3d }_{ xz }^{ 1 }\)
5.
(c)
L, M, O, P
6.
(c)
[Co(OX)2(OH)2]2-
7.
(d)
have tetrahedral and square planar geometry respectively
8.
(c)
[Co(NH3)6]Cl3
9.
(d)
K2[Ni(EDTA)]
10.
(a)
Triamminechloridobromidonitroplatinum (IV) chloride
11.
(d)
dien
12.
( )
dx2-y2 and dz2, e and dxy, dyz and dxz, t2
13.
( )
+3
14.
( )
+2
15.
( )
Pale blue
16.
( )
Zero
17.
( )
0.0
18.
It is larger in case of octahedral crystal field \(\left(\triangle_t=4 / 9 \triangle_0 \text { or } \triangle_0=9 / 4 \triangle_t\right) \text {. }\)
19.
(i) Optical isomerism
(ii) Coordination isomerism because some Cl and NH3 ligands may interchange, e.g., \(\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}\right]\left[\mathrm{Pt}\left(\mathrm{NH}_3\right) \mathrm{Cl}_3\right] \text {. }\)
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