Question 11 Mark
How many geometrical isomers are possible in the following coordination entitie? $\ce{[Co(NH_3)_3Cl_3]}$
Answer
View full question & answer→Two geometrical isomers are possible $($fac and mer$)$ in this coordination entity.
Questions · Page 1 of 2
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50 questions · 3 auto-graded MCQ + 47 self-marked written.
MCQ 21 Mark
How many ions are produced from the complex $\ce{Co(NH_3)_6Cl_2}$ in solution?
- A$6$
- B$4$
- C$3$
- ✓$2$
Answer
View full question & answer→Correct option: D.
$2$
The given complex can be written as $\ce{Co(NH_3)_6 Cl_2}.$
Thus, $\ce{[Co(NH_3)_6]^+}$ along with two $Cl^-$ ions are produced.
Thus, $\ce{[Co(NH_3)_6]^+}$ along with two $Cl^-$ ions are produced.
MCQ 31 Mark
Amongst the following, the most stable complex is :
- A$[\ce{Fe(H2O)6]^{3+}}$
- B$[\ce{Fe(NH3)6]^{3+}}$
- ✓$[\ce{Fe(C2O4)3]^{3–}}$
- D$[\ce{FeCl6]^{3–}}$
Answer
View full question & answer→Correct option: C.
$[\ce{Fe(C2O4)3]^{3–}}$
In each of the given complex$, Fe$ is in $+3$ oxidation state.
As $\ce{C2O4}^{2-}$ is didentate chelating ligand, it forms chelate rings and hence $(c)$ out of complexes given above is the most stable complex.
As $\ce{C2O4}^{2-}$ is didentate chelating ligand, it forms chelate rings and hence $(c)$ out of complexes given above is the most stable complex.
MCQ 41 Mark
The oxidation number of cobalt in $\ce{K[Co(CO)_4]}$ is:
- A$+1$
- B$+3$
- ✓$–1$
- D$–3$
Answer
View full question & answer→Correct option: C.
$–1$
We know that $CO$ is a neutral ligand and $K$ carries a charge of $+1$.
Therefore, the complex can be written as $\ce{K^+[Co(CO)_4]^-}$ .
Therefore, the oxidation number $−$ of $Co$ in the given complex is $-1.$
Hence, option $(iii)$ is correct.
Therefore, the complex can be written as $\ce{K^+[Co(CO)_4]^-}$ .
Therefore, the oxidation number $−$ of $Co$ in the given complex is $-1.$
Hence, option $(iii)$ is correct.
Question 51 Mark
Discuss briefly giving an example in case the role of coordination compounds in:
Analytical chemistry.
Analytical chemistry.
Answer
View full question & answer→Role of coordination compounds in analytical chemistry:During salt analysis, a number of basic radicals are detected with the help of the colour changes they exhibit with different reagents. These colour changes are a result of the coordination compounds or complexes that the basic radicals form with different ligands.
Question 61 Mark
Using $\ce{IUPAC}$ norms write the formula for the following: Tetrabromidocuprate $(II).$
Answer
View full question & answer→$\ce{[CuBr_4]^{2-}}$
Question 71 Mark
Write the $\ce{IUPAC}$ name of the following coordination compound: $\ce{K_2[PdCl_4]}$
Answer
View full question & answer→Potassium tetrachloridopalladate $(II).$
Question 81 Mark
Draw the structures of optical isomers of: $\ce{[Cr(C2O4)3]^{3–}}$
Answer
View full question & answer→$\ce{[Cr(C2O4)3]^{3–}\Rightarrow [Cr(ox)3]^{3-}}$
Question 91 Mark
Draw the structures of optical isomers of: $\ce{[Cr(NH_3)_2Cl_2(en)]^+}$
Answer
View full question & answer→$($cis$-$isomer only$)$ Cis $-\ce{[Cr(NH_3)_2Cl_2(en)]^+}$
Question 101 Mark
Draw the structures of optical isomers of: $\ce{[PtCl2(en)2]^{2+}}$
Answer
View full question & answer→$($cis$-$isomer only$)$ Cis $-\ce{[PtCl2(en)2]^{2+}}$
Question 111 Mark
Write the $\ce{IUPAC}$ name of the following coordination compound: $\ce{K_3[Fe(C_2O_4)_3]}$
Answer
View full question & answer→Potassium trioxalatoferrate $(III).$
Question 121 Mark
Using $\ce{IUPAC}$ norms write the formula for the following: Tetrahydroxozincate $(II).$
Answer
View full question & answer→$\ce{[Zn(OH)_4J]^{2-}}$
Question 131 Mark
What will be the correct order for the wavelengths of absorption in the visible region for the following:
$\ce{[Ni(NO_2)_6]^{4–}, [Ni(NH_3)_6]^{2+}, [Ni(H_2O)_6]^{2+}}$?
$\ce{[Ni(NO_2)_6]^{4–}, [Ni(NH_3)_6]^{2+}, [Ni(H_2O)_6]^{2+}}$?
Answer
View full question & answer→As metal ion is fixed, the increasing field strengths, i.e., the $\text{CFSE}$ values of the ligands from the spectro$-$chemical series are in the order: $\ce{H_2O < NH_3 < NO_2^-}$; 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 141 Mark
How many geometrical isomers are possible in the following coordination entitie? $\ce{[Cr(C_2O_4)_3]^{3–}}$
Answer
View full question & answer→No geometrical isomers are possible in this coordination entity.
Question 151 Mark
Write the formulas for the following coordination compounds : Iron $(III)$ hexacyanoferrate $(II)$
Answer
View full question & answer→Iron $(III)$ hexacyanoferrate $(II) \ \ce{Fe4[Fe(CN)6]3}.$
Question 161 Mark
Give evidence that $[\ce{Co(NH3)5Cl]SO4}$ and $[\ce{Co(NH3)5SO4]Cl}$ 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:
$[\ce{Co(NH3)5Cl]SO4 + Ba^{2+} \rightarrow BaSO4(s)} \downarrow$
$[\ce{Co(NH3)5SO4]Cl + Ba^{2+}} \rightarrow$ No reaction
$[\ce{Co(NH3)5Cl]SO4 + Ag}^+ \rightarrow$ No reaction
$[\ce{Co(NH3)5SO4] Cl+ Ag+ \rightarrow AgCl(s)}$
$[\ce{Co(NH3)5Cl]SO4 + Ba^{2+} \rightarrow BaSO4(s)} \downarrow$
$[\ce{Co(NH3)5SO4]Cl + Ba^{2+}} \rightarrow$ No reaction
$[\ce{Co(NH3)5Cl]SO4 + Ag}^+ \rightarrow$ No reaction
$[\ce{Co(NH3)5SO4] Cl+ Ag+ \rightarrow AgCl(s)}$
Question 171 Mark
Specify the oxidation number of the metal in the following coordination entitie: $\ce{[Co(H_2O)(CN)(en)_2]^{2+}}$
Answer
View full question & answer→$\ce{[Co(H_2O)(CN)(en)_2]^{2+}}$
$x + 0 + (-1) + 0 = +2$
$x = +3$
$x + 0 + (-1) + 0 = +2$
$x = +3$
Question 181 Mark
Write the $\ce{IUPAC}$ name of the following coordination compound: $\ce{K_3[Fe(CN)_6]}$
Answer
View full question & answer→Potassium hexacyanoferrate $(III).$
Question 191 Mark
Calculate the overall complex dissociation equilibrium constant for the $\ce{Cu(NH3)4}^{2+}$ ion, given that $\beta_4$ for this complex is $2.1 \times 10^{13}$.
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 201 Mark
Predict the number of unpaired electrons in the square planar $\ce{[Pt(CN)_4]^{2–}}$ ion.
Answer
View full question & answer→$\ce{[Pt(CN)_4]^{2-}}: $the outer shell electronic configurationof $Pt$ is $5d^{9 }6s^1.In +2$ state of $Pt,$is $5d^8$,i.e.,
For squre planer geometry, hybridisation is ds $p^2.$
Hence, the two $d e^{-1}s$ pair up to make oned$-$orbital empty.
So, there is no unpaired $r^-$
Hence, the two $d e^{-1}s$ pair up to make oned$-$orbital empty.
So, there is no unpaired $r^-$
Question 211 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 $[\ce{Au(CN)2}].$
From this solution, gold is later extracted by the addition of zinc metal.
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 $[\ce{Au(CN)2}].$
From this solution, gold is later extracted by the addition of zinc metal.
Question 221 Mark
Write the $\ce{IUPAC}$ name of the following coordination compound: $\ce{[Pt(NH_3)_2Cl(NH_2CH_3)]Cl}$
Answer
View full question & answer→Diamminechlorido $($methylamine$)$ platinum $(II)$ chloride.
Question 231 Mark
Using $\ce{IUPAC}$ norms write the formula for the following: Pentaamminenitrito$-O-$cobalt $(III).$
Answer
View full question & answer→$\ce{[Co(NH_3)_5(ONO)]^{2+}}$
Question 241 Mark
Write the $\ce{IUPAC}$ name of the following coordination compound: $\ce{[Co(NH_3)_5Cl]Cl_2}$
Answer
View full question & answer→Pentaamminechloridocobalt $(III)$ chloride.
Question 251 Mark
Write the $\ce{IUPAC}$ name of the following coordination compound: $\ce{[Co(NH_3)_6]Cl_3}$
Answer
View full question & answer→Hexaamminecobalt $(III)$ chloride.
Question 261 Mark
Write the formula for the following coordination compound: Tris $($ethane$-1, 2-$diamine$)$ chromium $(III)$ chloride.
Answer
View full question & answer→Tris $($ethane$-1, 2-$diamine$)$ chromium $(III)$ chloride $- \ce{[Cr(en)_3]Cl_3}$
Question 271 Mark
Write the formula for the following coordination compound: Dichloridobis $($ethane$-1, 2-$diamine$)$ platinum $(IV)$ nitrate.
Answer
View full question & answer→Dichlororidobis $($ethane$-1, 2-$diamine$)$ platinum $(IV)$ nitrate $-\ce{[PtCl2(en)2](NO3)2}$
Question 281 Mark
Using $\ce{IUPAC}$ norms write the formula for the following:Potassium tetrachloridopalladate $(II).$
Answer
View full question & answer→$\ce{K_2[PdCl_4]}$
Question 291 Mark
Using $\ce{IUPAC}$ norms write the formula for the following: Potassium tri $($oxalato$)$ chromate $(III).$
Answer
View full question & answer→$\ce{K_3[Cr(C_2O_4)_3]}$
Question 301 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 311 Mark
Using $\ce{IUPAC}$ norms write the systematic name of the following: $\ce{[NiCl_4]^{2–}}$
Answer
View full question & answer→Tetrachloridonickelate $(II)$ ion.
Question 321 Mark
Write the formula for the following coordination compound: Amminebromidochloridonitrito$-N-$platinate $(II).$
Answer
View full question & answer→Amine bromido chlorido nitrito$-N-$platinate $(II) - \ce{[Pt(NH3)BrCl(NO2)]}$
Question 331 Mark
Specify the oxidation numbers of the metals in the following coordination entities: $\ce{[Cr(NH_3)_3Cl_3]}$
Answer
View full question & answer→$\ce{[Cr(NH_3)_3Cl_3]}$
$x + 0 + 3 (-1) = 0$
$x = +3$
$x + 0 + 3 (-1) = 0$
$x = +3$
Question 341 Mark
Specify the oxidation number of the metal in the following coordination entitie: $\ce{[PtCl_4]^{2–}}$
Answer
View full question & answer→$\ce{[PtCl_4]^{2–}}$
$x - 4 = -2$
$x = +2$
$x - 4 = -2$
$x = +2$
Question 351 Mark
Specify the oxidation number of the metal in the following coordination entitie: $\ce{K_3[Fe(CN)_6]}$
Answer
View full question & answer→$\ce{K_3[Fe(CN)_6]}$
$3 + x + 6 (-l) = 0$
$x = +3$
$3 + x + 6 (-l) = 0$
$x = +3$
Question 361 Mark
Using $\ce{IUPAC}$ norms write the formula for the following: Hexaamminecobalt $(III)$ sulphate.
Answer
View full question & answer→$\ce{Co(NH_3)_6]^2(SO_4)_3}$
Question 371 Mark
Using $\ce{IUPAC}$ norms write the systematic name of the following: $\ce{[Ni(NH_3)_6]Cl_2}$
Answer
View full question & answer→Hexaammine nickel $(II)$ chloride.
Question 381 Mark
Write the formula for the following coordination compound:
Potassium tetracyanonickelate $(II)$.
Potassium tetracyanonickelate $(II)$.
Answer
View full question & answer→Potassium tetracyanonickelate $(II) – \ce{K2[Ni(CN)4}]$
Question 391 Mark
$\ce{[Fe(H_2O)_6]^{3+}}$ is strongly paramagnetic whereas $\ce{[Fe(CN)_6]^{3–}}$ 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 $d^2sp^3$ forming inner orbital complex. In the presence of $H_2O, ($a weak ligand$), 3d$ electrons do not pair up. The hybridisation is $sp^3d^2$ forming an outer orbital complex containing five unpaired electrons, thus greater the number of unpaired electrons more is the paramagnetic behavior.
Question 401 Mark
Write the formula for the following coordination compound:
Tetraamminediaquacobalt $(III)$ chloride.
Tetraamminediaquacobalt $(III)$ chloride.
Answer
View full question & answer→Tetraaminediaquacobalt $(III)$ chloride $- [\ce{Co(NH3)4(H_2O)2]Cl3}$
Question 411 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 421 Mark
Using $\ce{IUPAC}$ norms write the systematic name of the following: $[\ce{Co(en)3}]^{3+}$
Answer
View full question & answer→Tris $($ethane $-1, 2-$ diamine$)$ cobaIt $(III)$ ion.
Question 431 Mark
Using $\text{IUPAC}$ norms write the formula for the following: Hexaammineplatinum $(IV).$
Answer
View full question & answer→$\ce{[Pt(NH_3)_6]^{4+}}$
Question 441 Mark
Specify the oxidation number of the metal in the following coordination entitie : $[\ce{CoBr2(en)2}]^+$
Answer
View full question & answer→$[\ce{CoBr2(en)2}]^+$
$x + 2 (-1) + 0 = +1$
$x = +3$
$x + 2 (-1) + 0 = +1$
$x = +3$
Question 451 Mark
Using $\text{IUPAC}$ norms write the systematic name of the following:$\ce{[Co(NH_3)_4Cl(NO_2)]Cl}$
Answer
View full question & answer→Tetraammine chlorido nitrito$-N-$cobalt $(IV)$ chloride.
Question 461 Mark
Using $\text{IUPAC}$ norms write the systematic name of the following : $[\ce{Mn(H2O)6}]^{2+}$
Answer
View full question & answer→Hexaaquamanganese $(II)$ ion.
Question 471 Mark
Using $\text{IUPAC}$ norms write the systematic name of the following:$\ce{[Ni(CO)_4]}$
Answer
View full question & answer→Tetra carbonyl nickel $(0).$
Question 481 Mark
Amongst the following ions which one has the highest magnetic moment value?
- $[Cr(H_2O)_6]^{3+}$
- $[Fe(H_2O)_6]^{2+}$
- $[Zn(H_2O)_6]^{2+}$
Answer
$=\sqrt{\text{3}(\text{3}+2)}$
$=\sqrt{15}$
$=\text{~}4\text{BM}$
$=\sqrt{24}$
$=\text{~}5\text{BM}$
View full question & answer→- $[Fe(H_2O)_6]^{2+}$
- No. of unpaired electrons in $[Cr(H_2O)_6]^{3+}= 3$
$=\sqrt{\text{3}(\text{3}+2)}$
$=\sqrt{15}$
$=\text{~}4\text{BM}$
- No. of unpaired electrons in $[Fe(H_2O)_6]^{2+}= 4$
$=\sqrt{24}$
$=\text{~}5\text{BM}$
- No. of unpaired electrons in $[Zn(H_2O)_6]^{2+}= 0$
Question 491 Mark
Using $\text{IUPAC}$ norms write the formula for the following: Diamminedichloridoplatinum $(II).$
Answer
View full question & answer→$\ce{[Pt(NH_3)_2Cl_2]}$
Question 501 Mark
Using $\text{IUPAC}$ norms write the formula for the following:
Potassium tetracyanonickelate $(II).$
Potassium tetracyanonickelate $(II).$
Answer
View full question & answer→$K_2[Ni(CN)_4]$