Crystal field splitting energy (CFSE) for high spin $d^4$ octahedral complex is:
- (a)$-1\cdot6 \,\Delta_o$
- (b)$-1\cdot2 \,\Delta_o$
- (c)$-0\cdot8 \,\Delta_o$
- (d)$-0\cdot6 \,\Delta_o$
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Coordination Compounds - ISC Class 12 Chemistry Questions with Answers, Page 3
57 past-paper questions on Coordination Compounds from ISC Class 12 Chemistry papers (2027-2018), newest first, in full. Questions 41-57 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.
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(i)[3.0]
A coordination compound has a formula $\text{CoCl}_3\cdot 4\text{NH}_3$. It precipitates silver ions as $\text{AgCl}$ and its molar conductance corresponds to a total of two ions. Based on this information, answer the following questions.
(a) Deduce structural formula of the complex compound.
(b) Write the IUPAC name of the complex compound.
(c) Draw the geometrical isomers of the complex compound.
(ii)[2.0]
Give a chemical test to show that $[\text{Co}(\text{NH}_3)_5\text{Cl}]\text{SO}_4$ and $[\text{Co}(\text{NH}_3)_5\text{SO}_4]\text{Cl}$ are ionisation isomers.
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(i)[3.0]
When one mole of an isomer of the complex $[\text{Cr}(\text{H}_2\text{O})_6]\text{Cl}_3$ is treated with $\text{AgNO}_3$, it produces $1\text{ mole}$ of a white precipitate of $\text{AgCl}$.
Write the formula of this isomer of the complex and show how the metal-ligand bonding differs in the isomers.
(ii)[2.0]
A coordination compound shows $d^2sp^3$ hybridisation. Identify the nature of ligand as weak or strong. What will be the geometry of the compound?
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Choose the appropriate word(s) from the bracket [lead poisoning, zero, phosgene, dependent, cancer, independent, diethyl ether, first, ethyl carbonate, ethene]:
EDTA is used in the treatment of ____ while Cisplatin is used in the treatment of ____.
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The metal complex ion that is paramagnetic is:
(Atomic number of $\text{Fe} = 26$, $\text{Cu} = 29$, $\text{Co} = 27$ and $\text{Ni} = 28$)
- (a)$[\text{Fe}(\text{CN})_4]^{2-}$
- (b)$[\text{Co}(\text{NH}_3)_6]^{3+}$
- (c)$[\text{Ni}(\text{CN})_4]^{2-}$
- (d)$[\text{Cu}(\text{NH}_3)_4]^{2+}$
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(i)[3.0]
Name the type of isomerism shown by the following pairs of coordination compounds:
(a) $[\text{Pt}(\text{H}_2\text{O})_4\text{Cl}_2]\text{Cl}_2\cdot\text{H}_2\text{O}$ and $[\text{Pt}(\text{H}_2\text{O})_3\text{Cl}_3]\text{Cl}\cdot 2\text{H}_2\text{O}$
(b) $[\text{Co}(\text{NH}_3)_4\text{Cl}_2]\text{Br}_2$ and $[\text{Co}(\text{NH}_3)_4\text{Br}_2]\text{Cl}_2$
(c) $[\text{Cr}(\text{H}_2\text{O})_5(\text{SCN})]\text{Cl}_2$ and $[\text{Cr}(\text{H}_2\text{O})_5(\text{NCS})]\text{Cl}_2$
(ii)[2.0]
Consider the complex ion $[\text{Co}(\text{CN})_6]^{3-}$ and answer the following questions:
(atomic number of $\text{Co} = 27$)
(a) Type of hybridisation of central metal atom
(b) Magnetic nature
(c) Geometry of the complex ion
(d) Low spin complex or high spin complex
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Match the following:
Column A
- (i)Phenol
- (ii)Ethylenediamine
- (iii)Colligative property
- (iv)Amino acid
Column B
- (a)Osmotic pressure
- (b)Zwitter ion
- (c)Neutral $\text{FeCl}_3$ solution
- (d)Bidentate ligand.
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Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
[two, Williamson’s synthesis, three, anisole, toluene, Friedel-Crafts alkylation, iodoform, sec-1, mol-1L sec-1, Lewis base, acetone, Lewis acid, chloroform, formaldehyde]
(i)[1.0]
Sodium phenoxide reacts with methyl chloride to give ____. The reaction is known as ____.
(ii)[1.0]
When the concentration of a reactant of first order reaction is tripled, the rate of reaction becomes ____ times. The unit of rate constant ($k$) for the first order reaction is ____.
(iii)[1.0]
In coordination complexes, the central metal atom or ion behaves as ____ and the ligands behave as ____.
(iv)[1.0]
Calcium acetate on dry distillation gives ____ which gives ____ on heating with iodine and alkali.
No answer yet.
(i)[3.0]
Name the type of isomerism exhibited by the following pairs of compounds:
(a) $[\text{Co}(\text{NH}_3)_5(\text{ONO})]\text{Cl}_2$ and $[\text{Co}(\text{NH}_3)_5(\text{NO}_2)]\text{Cl}_2$
(b) $[\text{Cr}(\text{H}_2\text{O})_5\text{Cl}]\text{Cl}_2\cdot\text{H}_2\text{O}$ and $[\text{Cr}(\text{H}_2\text{O})_4\text{Cl}_2]\text{Cl}\cdot2\text{H}_2\text{O}$
(c) $[\text{Pt}(\text{NH}_3)_4\text{Cl}_2]\text{Br}_2$ and $[\text{Pt}(\text{NH}_3)_4\text{Br}_2]\text{Cl}_2$
(ii)[2.0]
Write the IUPAC names of the following complexes:
(a) $[\text{Co}(\text{NH}_3)_4(\text{H}_2\text{O})_2]\text{Cl}_3$
(b) $\text{K}_2[\text{Ni}(\text{CN})_4]$
No answer yet.
Name the type of isomerism shown by each of the following pairs of compounds:
(i)
$[\text{CoCl}_2(\text{NH}_3)_4]\text{Cl}\cdot\text{H}_2\text{O}$ and $[\text{CoCl}(\text{H}_2\text{O})(\text{NH}_3)_4]\text{Cl}_2$
(ii)
$[\text{Cr}(\text{NH}_3)_5\text{Br}]\text{SO}_4$ and $[\text{Cr}(\text{NH}_3)_5\text{SO}_4]\text{Br}$
No answer yet.
The type of hybridization involved in Octahedral complexes is:
- (a)$sp^3$
- (b)$dsp^2$
- (c)$sp^3d$
- (d)$d^2sp^3$
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(i)
Write the formula of each of the following compounds:
(a) Potassium trioxalatoaluminate (III)
(b) Triammine triaquachromium (III) chloride
(ii)
For the complex ion $[\text{Co}(\text{NH}_3)_6]^{3+}$, state the oxidation state of central metal atom and the coordination number of the complex ion.
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(i)
Write the IUPAC names of the following complexes:
(1) $[\text{Cu}(\text{NH}_3)_4]\text{SO}_4$
(2) $[\text{Co}(\text{en})_2\text{Cl}_2]$
(3) $\text{K}_3[\text{Al}(\text{C}_2\text{O}_4)_3]$
(ii)
With reference to the coordination complex ion $[\text{Fe}(\text{H}_2\text{O})_6]^{2+}$ answer the following: (at. no. of $\text{Fe} = 26$)
(1) Give the IUPAC name of the complex ion.
(2) What is the oxidation number of the central metal atom?
(3) How many unpaired electrons are there in the complex ion?
(4) State the type of hybridisation of the complex ion.
No answer yet.
(i)
Name of the type of isomerism exhibited by the following pairs of compounds:
(1) $[\text{Co}(\text{ONO})(\text{NH}_3)_5]^{2+}$ and $[\text{Co}(\text{NO}_2)(\text{NH}_3)_5]^{2+}$
(2) $[\text{Cr}(\text{H}_2\text{O})_4\text{Cl}_2]\text{Cl}\cdot2\text{H}_2\text{O}$ and $[\text{Cr}(\text{H}_2\text{O})_5\text{Cl}]\text{Cl}_2\cdot\text{H}_2\text{O}$
(3) $[\text{Co}(\text{NH}_3)_6][\text{Cr}(\text{CN})_6]$ and $[\text{Cr}(\text{NH}_3)_6][\text{Co}(\text{CN})_6]$
(ii)
Using the valence bond approach, predict the shape, hybridisation and magnetic behaviour of $[\text{Ni}(\text{CO})_4]$. (at. no. of $\text{Ni} = 28$)
No answer yet.
(i)
Write the IUPAC names of the following:
(1) $\text{K}_3[\text{Fe}(\text{C}_2\text{O}_4)_3]$
(2) $[\text{Co}(\text{NH}_3)_5\text{Cl}]\text{SO}_4$
(ii)
$[\text{Fe}(\text{CN})_6]^{4-}$ is a coordination complex ion.
(1) Calculate the oxidation number of iron in the complex.
(2) Is the complex ion diamagnetic or paramagnetic?
(3) What is the hybridisation state of the central metal atom?
(4) Write the IUPAC name of the complex ion.
No answer yet.
(a)
For the complex ion $[\text{Fe}(\text{CN})_6]^{3-}$, state:
(i) the type of hybridisation.
(ii) the magnetic behaviour.
(iii) the oxidation number of the central metal atom.
(b)
Write the IUPAC name of $[\text{Co}(\text{en})_2\text{Cl}_2]^+$ ion and draw the structures of its geometrical isomers.
No answer yet.
(a)
What type of isomers are $[\text{Co}(\text{NH}_3)_5\text{Br}]\text{SO}_4$ and $[\text{Co}(\text{NH}_3)_5\text{SO}_4]\text{Br}$? Give a chemical test to distinguish between the two isomers.
(b)
Write the structures of optical isomers of the complex ion $[\text{Co}(\text{en})_2\text{Cl}_2]^+.$
No answer yet.