Question 11 Mark
Draw the structures of optical isomers of:
[PtCl2(en)2]2+
[PtCl2(en)2]2+
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Question 21 Mark
Predict the number of unpaired electrons in the square planar [Pt(CN)4]2– ion.
Question 31 Mark
Discuss briefly giving an example in case the role of coordination compounds in:
Extraction/ metallurgy of metals.
Extraction/ metallurgy of metals.
Answer
View full question & answer→Role of coordination compounds in extraction/ metallurgy of metals:
The process of extraction of some of the metals from their ores involves the formation of complexes. For example, in aqueous solution, gold combines with cyanide ions to form [Au(CN)2]. From this solution, gold is later extracted by the addition of zinc metal.
Question 41 Mark
Write the IUPAC name of the following coordination compound:
K3[Fe(C2O4)3]
K3[Fe(C2O4)3]
Answer
View full question & answer→Potassium trioxalatoferrate (III).
Question 51 Mark
Using IUPAC norms write the formula for the following:
Tetrahydroxozincate (II).
Tetrahydroxozincate (II).
Answer
View full question & answer→[Zn(OH)4J]2-
Question 61 Mark
What will be the correct order for the wavelengths of absorption in the visible region for the following:
[Ni(NO2)6]4–, [Ni(NH3)6]2+, [Ni(H2O)6]2+?
[Ni(NO2)6]4–, [Ni(NH3)6]2+, [Ni(H2O)6]2+?
Answer
View full question & answer→As metal ion is fixed, the increasing field strengths, i.e., the CFSE values of the ligands from the spectro-chemical series are in the order: H2O< NH3< NO2-; Thus, the energies absorbed for excitation will be in the order:
$[\text{Ni}(\text{H}_{2}\text{O})_{6}]^{2+}<[\text{Ni}(\text{N}\text{H}_{3})_{6}]^{2+}<[\text{Ni}(\text{N}\text{O}_{2})_{6}]^{4-}$
As $\text{E}=\frac{\text{hc}}{\lambda}$ the wavelenghs absorbed will be in the opposite order.
$[\text{Ni}(\text{H}_{2}\text{O})_{6}]^{2+}<[\text{Ni}(\text{N}\text{H}_{3})_{6}]^{2+}<[\text{Ni}(\text{N}\text{O}_{2})_{6}]^{4-}$
As $\text{E}=\frac{\text{hc}}{\lambda}$ the wavelenghs absorbed will be in the opposite order.
Question 71 Mark
Write the IUPAC name of the following coordination compound:
[Pt(NH3)2Cl(NH2CH3)]Cl
[Pt(NH3)2Cl(NH2CH3)]Cl
Answer
View full question & answer→Diamminechlorido (methylamine) platinum (II) chloride.
Question 81 Mark
Using IUPAC norms write the formula for the following:
Pentaamminenitrito-O-cobalt (III).
Pentaamminenitrito-O-cobalt (III).
Answer
View full question & answer→[Co(NH3)5(ONO)]2+
Question 91 Mark
Write the IUPAC name of the following coordination compound:
[Co(NH3)5Cl]Cl2
[Co(NH3)5Cl]Cl2
Answer
View full question & answer→Pentaamminechloridocobalt (III) chloride.
Question 101 Mark
Write the IUPAC name of the following coordination compound:
[Co(NH3)6]Cl3
[Co(NH3)6]Cl3
Answer
View full question & answer→Hexaamminecobalt (III) chloride.
Question 111 Mark
Write the formula for the following coordination compound:
Tris (ethane–1, 2–diamine) chromium (III) chloride.
Tris (ethane–1, 2–diamine) chromium (III) chloride.
Answer
View full question & answer→Tris (ethane-1, 2-diamine) chromium (III) chloride – [Cr(en)3]Cl3
Question 121 Mark
How many geometrical isomers are possible in the following coordination entitie?
[Cr(C2O4)3]3–
[Cr(C2O4)3]3–
Answer
View full question & answer→[Cr(C2O4)3]3–
No geometrical isomers are possible in this coordination entity.
No geometrical isomers are possible in this coordination entity.
Question 131 Mark
Write the formulas for the following coordination compounds:
Iron(III) hexacyanoferrate(II)
Iron(III) hexacyanoferrate(II)
Answer
View full question & answer→Iron(III) hexacyanoferrate(II) Fe4[Fe(CN)6]3.
Question 141 Mark
Give evidence that [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl are ionisation isomers.
Answer
View full question & answer→The ionisation isomers dissolve in water to yield different ions and thus react differently to various reagents:
[Co(NH3)5Cl]SO4 + Ba2+ → BaSO4(s) ↓
[Co(NH3)5SO4]Cl + Ba2+ → No reaction
[Co(NH3)5Cl]SO4 + Ag+ → No reaction
[Co(NH3)5SO4] Cl+ Ag+ → AgCl(s)
[Co(NH3)5Cl]SO4 + Ba2+ → BaSO4(s) ↓
[Co(NH3)5SO4]Cl + Ba2+ → No reaction
[Co(NH3)5Cl]SO4 + Ag+ → No reaction
[Co(NH3)5SO4] Cl+ Ag+ → AgCl(s)
Question 151 Mark
Specify the oxidation number of the metal in the following coordination entitie:
[Co(H2O)(CN)(en)2]2+
[Co(H2O)(CN)(en)2]2+
Answer
View full question & answer→[Co(H2O)(CN)(en)2]2+
x + 0 + (-1) + 0 = +2
x = +3
x + 0 + (-1) + 0 = +2
x = +3
Question 161 Mark
Write the IUPAC name of the following coordination compound:
K3[Fe(CN)6]
K3[Fe(CN)6]
Answer
View full question & answer→Potassium hexacyanoferrate (III).
Question 171 Mark
Calculate the overall complex dissociation equilibrium constant for the Cu(NH3)42+ ion, given that β4 for this complex is 2.1 × 1013.
Answer
View full question & answer→$\beta_{4} =2.1\times10^{13}$
The overall complex dissociation equilibrium constant is the reciprocal of the overall stability constant, $\beta_{4}$
$\therefore\frac{1}{\beta_{4}}=\frac{1}{2.1\times10^{13}}$
$=4.7\times10^{-14}$
The overall complex dissociation equilibrium constant is the reciprocal of the overall stability constant, $\beta_{4}$
$\therefore\frac{1}{\beta_{4}}=\frac{1}{2.1\times10^{13}}$
$=4.7\times10^{-14}$
Question 181 Mark
Write the formula for the following coordination compound:
Dichloridobis (ethane–1, 2–diamine) platinum (IV) nitrate.
Dichloridobis (ethane–1, 2–diamine) platinum (IV) nitrate.
Answer
View full question & answer→Dichlororidobis (ethane-1, 2-diamine) platinum (IV) nitrate – [PtCl2(en)2](NO3)2
Question 191 Mark
Using IUPAC norms write the formula for the following:
Potassium tetrachloridopalladate (II).
Potassium tetrachloridopalladate (II).
Answer
View full question & answer→K2[PdCl4]
Question 201 Mark
Using IUPAC norms write the formula for the following:
Potassium tri (oxalato) chromate (III).
Potassium tri (oxalato) chromate (III).
Answer
View full question & answer→K3[Cr(C2O4)3]
Question 211 Mark
Discuss briefly giving an example in case the role of coordination compound in:
Biological systems.
Biological systems.
Answer
View full question & answer→Role of coordination compounds in biological systems:
We know that photosynthesis is made possible by the presence of the chlorophyll pigment. This pigment is a coordination compound of magnesium. In the human biological system, several coordination compounds play important roles. For example, the oxygen-carrier of blood, i.e., haemoglobin, is a coordination compound of iron.
We know that photosynthesis is made possible by the presence of the chlorophyll pigment. This pigment is a coordination compound of magnesium. In the human biological system, several coordination compounds play important roles. For example, the oxygen-carrier of blood, i.e., haemoglobin, is a coordination compound of iron.
Question 221 Mark
Using IUPAC norms write the systematic name of the following:
[NiCl4]2–
[NiCl4]2–
Answer
View full question & answer→Tetrachloridonickelate (II) ion.
Question 231 Mark
Write the formula for the following coordination compound:
Amminebromidochloridonitrito-N-platinate (II).
Amminebromidochloridonitrito-N-platinate (II).
Answer
View full question & answer→Amine bromido chlorido nitrito-N-platinate (II) – [Pt(NH3)BrCl(NO2)]
Question 241 Mark
Specify the oxidation numbers of the metals in the following coordination entities:
[Cr(NH3)3Cl3]
[Cr(NH3)3Cl3]
Answer
View full question & answer→[Cr(NH3)3Cl3]
x + 0 + 3 (-1) = 0
x = +3
x + 0 + 3 (-1) = 0
x = +3
Question 251 Mark
Specify the oxidation number of the metal in the following coordination entitie:
[PtCl4]2–
[PtCl4]2–
Answer
View full question & answer→[PtCl4]2–
x - 4 = -2
x = +2
x - 4 = -2
x = +2
Question 261 Mark
Specify the oxidation number of the metal in the following coordination entitie:
K3[Fe(CN)6]
K3[Fe(CN)6]
Answer
View full question & answer→K3[Fe(CN)6]
3 + x + 6 (-l) = 0
x = +3
3 + x + 6 (-l) = 0
x = +3
Question 271 Mark
Using IUPAC norms write the formula for the following:
Hexaamminecobalt (III) sulphate.
Hexaamminecobalt (III) sulphate.
Answer
View full question & answer→Co(NH3)6]2(SO4)3
Question 281 Mark
Using IUPAC norms write the systematic name of the following:
[Ni(NH3)6]Cl2
[Ni(NH3)6]Cl2
Answer
View full question & answer→Hexaammine nickel (II) chloride.
Question 291 Mark
Write the formula for the following coordination compound:
Potassium tetracyanonickelate (II).
Potassium tetracyanonickelate (II).
Answer
View full question & answer→Potassium tetracyanonickelate (II) – K2[Ni(CN)4]
Question 301 Mark
[Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3– is weakly paramagnetic. Explain.
Answer
View full question & answer→In presence of CN–, (a strong ligand) the 3d electrons pair up leaving only one unpaired electron. The hybridisation is d2sp3 forming inner orbital complex. In the presence of H2O, (a weak ligand), 3d electrons do not pair up. The hybridisation is sp3d2 forming an outer orbital complex containing five unpaired electrons, thus greater the number of unpaired electrons more is the paramagnetic behavior.
Question 311 Mark
Write the formula for the following coordination compound:
Tetraamminediaquacobalt (III) chloride.
Tetraamminediaquacobalt (III) chloride.
Answer
View full question & answer→Tetraaminediaquacobalt (III) chloride - [Co(NH3)4(H2O)2]Cl3
Question 321 Mark
Discuss briefly giving an example in case the role of coordination compounds in:
Medicinal chemistry.
Medicinal chemistry.
Answer
View full question & answer→Role of coordination compounds in medicinal chemistry:
Certain coordination compounds of platinum (for example, cis-platin) are used for inhibiting the growth of tumours.
Certain coordination compounds of platinum (for example, cis-platin) are used for inhibiting the growth of tumours.
Question 331 Mark
Using IUPAC norms write the systematic name of the following:
[Co(en)3]3+
[Co(en)3]3+
Answer
View full question & answer→Tris (ethane -1, 2-diamine) cobaIt (III) ion.
Question 341 Mark
Using IUPAC norms write the formula for the following:
Hexaammineplatinum (IV).
Hexaammineplatinum (IV).
Answer
View full question & answer→[Pt(NH3)6]4+
Question 351 Mark
Specify the oxidation number of the metal in the following coordination entitie:
[CoBr2(en)2]+
[CoBr2(en)2]+
Answer
View full question & answer→[CoBr2(en)2]+
x + 2 (-1) + 0 = +1
x = +3
x + 2 (-1) + 0 = +1
x = +3
Question 361 Mark
Using IUPAC norms write the systematic name of the following:
[Ni(CO)4]
Answer
View full question & answer→Tetra carbonyl nickel (0).
Question 371 Mark
Using IUPAC norms write the formula for the following:
Potassium tetracyanonickelate (II).
Potassium tetracyanonickelate (II).
Answer
View full question & answer→K2[Ni(CN)4]
Question 381 Mark
Using IUPAC norms write the formula for the following:
Pentaamminenitrito-N-cobalt (III).
Pentaamminenitrito-N-cobalt (III).
Answer
View full question & answer→[Co(N H3)5(NO2)]2+
Question 391 Mark
Using IUPAC norms write the systematic name of the following:
[Ti(H2O)6]3+
[Ti(H2O)6]3+
Answer
View full question & answer→Hexaaquatitanium (III) ion.
Question 401 Mark
How many geometrical isomers are possible in the following coordination entitie?
[Co(NH3)3Cl3]
Answer
View full question & answer→[Co(NH3)3Cl3]
Two geometrical isomers are possible (fac and mer) in this coordination entity.
Two geometrical isomers are possible (fac and mer) in this coordination entity.
Question 411 Mark
Using IUPAC norms write the systematic name of the following:
[Co(NH3)4Cl(NO2)]Cl
Answer
View full question & answer→Tetraammine chlorido nitrito-N-cobalt (IV) chloride.
Question 421 Mark
Using IUPAC norms write the systematic name of the following:
[Mn(H2O)6]2+
Answer
View full question & answer→Hexaaquamanganese (II) ion.
Question 431 Mark
Amongst the following ions which one has the highest magnetic moment value?
- [Cr(H2O)6]3+
- [Fe(H2O)6]2+
- [Zn(H2O)6]2+
Answer
View full question & answer→- [Fe(H2O)6]2+
- No. of unpaired electrons in [Cr(H2O)6]3+= 3
$\text{Then, µ}=\sqrt{\text{n}(\text{n}+2)}$
$=\sqrt{\text{3}(\text{3}+2)}$
$=\sqrt{15}$
$=\text{~}4\text{BM}$
- No. of unpaired electrons in [Fe(H2O)6]2+= 4
$\text{Then, µ}=\sqrt{4(4+2)}$
$=\sqrt{24}$
$=\text{~}5\text{BM}$
- No. of unpaired electrons in [Zn(H2O)6]2+= 0
Hence, [Fe(H2O)6]2+ has the highest magnetic moment value.
Question 441 Mark
Using IUPAC norms write the formula for the following:
Diamminedichloridoplatinum (II).
Diamminedichloridoplatinum (II).
Answer
View full question & answer→[Pt(NH3)2Cl2]
Question 451 Mark
Using IUPAC norms write the systematic name of the following:
[Co(NH3)6]Cl3
[Co(NH3)6]Cl3
Answer
View full question & answer→Hexaammine cobalt (111) chloride.
Question 461 Mark
Using IUPAC norms write the formula for the following:
Tetrabromidocuprate (II).
Tetrabromidocuprate (II).
Answer
View full question & answer→[CuBr4]2-
Question 471 Mark
Write the IUPAC name of the following coordination compound:
K2[PdCl4]
K2[PdCl4]
Answer
View full question & answer→Potassium tetrachloridopalladate (II).
Question 481 Mark
Using IUPAC norms write the systematic name of the following:
[Pt(NH3)2Cl(NH2CH3)]Cl
[Pt(NH3)2Cl(NH2CH3)]Cl
Answer
View full question & answer→Diammine chlorido (methylamine) platinum (II) chloride.
Question 491 Mark
How many ions are produced from the complex Co(NH3)6Cl2 in solution?
- 6
- 4
- 3
- 2
Answer
View full question & answer→-
3
The given complex can be written as Co(NH3)6 Cl2.
Thus, [Co(NH3)6]+ along with two Cl- ions are produced.
Question 501 Mark
Amongst the following, the most stable complex is:
- [Fe(H2O)6]3+
- [Fe(NH3)6]3+
- [Fe(C2O4)3]3–
- [FeCl6]3–
Answer
View full question & answer→- [Fe(C2O4)3]3–
In each of the given complex, Fe is in +3 oxidation state. As C2O42- is didentate chelating ligand, it forms chelate rings and hence (c) out of complexes given above is the most stable complex.