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Coordination Compounds - ISC Class 12 Chemistry Questions with Answers, Page 2

57 past-paper questions on Coordination Compounds from ISC Class 12 Chemistry papers (2027-2018), newest first, in full. Questions 21-40 are on this page, 20 to a page. Tap "Show answer" under a question to see its answer.

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2025 · 3 marks · Short answerOpen: According to Crystal-Field Theory, the electronic configuration of complex…
According to Crystal-Field Theory, the electronic configuration of complex compound [A] is $t_{2g}^4 e_g^2$ and that of complex compound [B] is $t_{2g}^6 e_g^0$.
(i)[1.0]
Which of the two complex compounds, [A] or [B], is a low spin complex?
(ii)[1.0]
Write the number of unpaired electrons in complex compounds [A] and [B].
(iii)[1.0]
Does complex [A] have strong field ligands or weak field ligands? Give a reason.

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2025 · 1 mark · MCQOpen: Gia applied magnetic field around and , she found that is strongly attracted…
Gia applied magnetic field around $[\text{Fe}(\text{H}_2\text{O})_6]^{2+}$ and $[\text{Fe}(\text{CN})_6]^{4-}$, she found that $[\text{Fe}(\text{H}_2\text{O})_6]^{2+}$ is strongly attracted towards magnet. Which of the following explains this correctly? (P) $\text{CN}^-$ is a weak ligand. (Q) $\text{H}_2\text{O}$ is a weak ligand. (R) $[\text{Fe}(\text{H}_2\text{O})_6]^{2+}$ is inner orbital complex. (S) $[\text{Fe}(\text{CN})_6]^{4-}$ is low spin complex.
  • (a)Only (S)
  • (b)Both (P) and (Q)
  • (c)Only (R)
  • (d)Both (Q) and (S)

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2025 · 1 mark · MCQOpen: What type of structural isomerism exists between the following pair of…
What type of structural isomerism exists between the following pair of coordination compounds? $[\text{Cr}(\text{H}_2\text{O})_4\text{Cl}_2]\text{Cl}\cdot2\text{H}_2\text{O}$ and $[\text{Cr}(\text{H}_2\text{O})_5\text{Cl}]\text{Cl}_2\cdot\text{H}_2\text{O}$
  • (a)Ionisation isomerism
  • (b)Hydrate isomerism
  • (c)Coordination isomerism
  • (d)Linkage isomerism

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2025 · 3 marks · Short answerOpen: Sodium ferrocyanide is used as anti-caking agent in salts and salt substitute…
Sodium ferrocyanide is used as anti-caking agent in salts and salt substitute. Due to contact with atmospheric moisture, table salt undergoes clumping. Adding certain amount of sodium ferrocyanide can prevent this from occurring. Consider the coordination compounds $\text{Na}_4[\text{Fe}(\text{CN})_6]$ and $[\text{Fe}(\text{H}_2\text{O})_6]\text{Cl}_2$. Based on above description, answer the following questions:
(a)
Though cyanide is poisonous, potassium ferrocyanide is used as food additive. Explain.
(b)
Which compound will be more stable $\text{Na}_4[\text{Fe}(\text{CN})_6]$ or $[\text{Fe}(\text{H}_2\text{O})_6]\text{Cl}_2$? Justify your answer.
(c)
Write the hydrate isomer of $[\text{Fe}(\text{H}_2\text{O})_6]\text{Cl}_2$, which gives one mole of precipitate with $\text{AgNO}_3$ solution.

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2025 · 2 marks · Short answerOpen: While conducting an experiment on coordination compounds, Shirin observed a…
While conducting an experiment on coordination compounds, Shirin observed a white precipitate when $\text{AgNO}_3$ solution was added to the aqueous solution of the complex $[\text{Co}(\text{NH}_3)_3(\text{en})\text{SO}_4]\text{Cl}$. How can the ionisation isomer of this complex be detected by a chemical test? Write the structure and the IUPAC name of the ionisation isomer.

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2025 · 2 marks · Short answerOpen: During chemistry class, a teacher wrote as a coordination complex ion on the…
During chemistry class, a teacher wrote $[\text{Ni}(\text{CN})_4]^{2-}$ as a coordination complex ion on the board. The students were asked to find out the magnetic behaviour and shape of the complex. Pari, a student, wrote the answer paramagnetic and tetrahedral whereas another student Suhail wrote diamagnetic and square planar. Evaluate Pari’s and Suhail’s responses.

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2025 · 1 mark · MCQOpen: On adding silver nitrate solution to , 1 mole of light-yellow precipitate of…
On adding silver nitrate solution to $\text{CoBr}_2\text{Cl}\cdot 4\text{NH}_3$, 1 mole of light-yellow precipitate of compound X is obtained. Which of the following statement explains this?
  • (a)2 bromine atoms are linked by primary valency.
  • (b)2 bromine atoms are linked by secondary valency.
  • (c)1 bromine atom is linked by primary valency.
  • (d)1 chlorine atom is linked by primary valency.

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2025 · 2 marks · Short answerOpen: Neha and Imran were given an assignment on the coordination complex . They had…
Neha and Imran were given an assignment on the coordination complex $[\text{Co}(\text{NH}_3)_6]\text{Cl}_3$. They had to find the hybridisation involved and the magnetic behaviour of the complex compound. Neha found that the complex compound was of $\text{sp}^3\text{d}^2$ hybridisation and paramagnetic in behaviour whereas, Imran found that the complex compound was of $\text{d}^2\text{sp}^3$ hybridisation and diamagnetic in behaviour. Evaluate the responses of Neha and Imran.

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2025 · 5 marks · Case basedOpen: Water pollution caused by toxic elements is one of the most important…
Water pollution caused by toxic elements is one of the most important environmental problems in the world. The objectives of this study were: the effects of chelating agents on heavy metals extraction from polluted water were carried out to examine Chelating agents like Ethylenediamine tetra acetate (EDTA), oxalic acid (OA) and citric acid (CA) were tested respectively. The effects of operating parameters, such as pH and extraction time were examined. Removal of metals was dependent on the concentration of extracting agent and raised with increasing concentration of chelating agents. Source: DOI : http://dx.doi.org/10.13005/ojc/330414
Figure for this question
(a)[1.0]
What are chelating agents?
(b)[1.0]
Name any two heavy metals which are considered toxic.
(c)[1.0]
From the above graph, arrange the order of chelating agents with respect to the % removal of toxic metals.
(d)[1.0]
Draw the structure of EDTA.
(e)[1.0]
What is the main factor on which the removal of metals depends on contaminated water using Chelating Agents?

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2025 · 1 mark · Fill inOpen: Fill in the blanks by choosing the appropriate word(s) from those given in the…
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [four, three, remains same, propane, $ns^{1-2}$, increases, six, propan-2-ol, $(n-1)d^{1-10}$, two, decreases, Clemmensen’s, Wolff-Kishner] In the complex ion $[\text{CoCl}(\text{en})_2\text{ONO}]^+$, the coordination number and the oxidation number of the central metal ion are ____ and ____.

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2025 · 3 marks · Short answerOpen: Food and drug administration (FDA) has approved that Ethylenediamine tetra…
Food and drug administration (FDA) has approved that Ethylenediamine tetra acetate (EDTA) is a medication in the treatment of lead poisoning. It is also used in the estimation of $\text{Ca}^{2+}$ and $\text{Mg}^{2+}$ during removal of hardness in water.
(a)
Which type of a ligand is EDTA?
(b)
Why EDTA is used in the treatment of lead poisoning?
(c)
What is the geometry of EDTA complex?

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2025 · 1 mark · Fill inOpen: Choose the appropriate word(s) from the bracket [ethanol, [Fe(H2O)6]2+, anode…
Choose the appropriate word(s) from the bracket [ethanol, [Fe(H2O)6]2+, anode, d2sp3, Cannizzaro, reducing, cathode, sp3d2, iodine, [Fe(CN)6]4-, methanol, aldol, oxidising, manganese dichloride]: The coordination compound ____ is an example of inner orbital complex and the hybridisation involved in the complex is ____.

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2025 · 3 marks · Short answerOpen: Answer the following: is an inner orbital complex whereas is an outer orbital…
Answer the following:
(i)[1.0]
$[\text{Co}(\text{NH}_3)_6]^{3+}$ is an inner orbital complex whereas $[\text{CoF}_6]^{3-}$ is an outer orbital complex. Why? (Given: Atomic number of $\text{Co} = 27$).
(ii)[1.0]
A coordination compound with molecular formula $\text{CrCl}_3\cdot6\text{H}_2\text{O}$ precipitates two moles of $\text{AgCl}$ with $\text{AgNO}_3$ solution. Write the structural formula of the compound.
(iii)[1.0]
Explain why an aqueous solution of $\text{K}_4[\text{Fe}(\text{CN})_6]$ is not toxic whereas an aqueous solution of $\text{KCN}$ is highly toxic.

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2025 · 3 marks · Short answerOpen: Assuming that cyanide is a strong ligand, write the formula of two coordination…
(i)[1.5]
Assuming that cyanide is a strong ligand, write the formula of two coordination complex ions with cyanide and iron having coordination number six. Name the complex ions.
(ii)[1.5]
On the basis of Crystal Field Theory, write the electronic configuration of $d^4$ ion if: (a) $\Delta_o > P$ (b) $\Delta_o < P$

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2025 · 1 mark · Fill inOpen: Fill in the blanks by choosing the appropriate word(s) from those given in the…
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [four, three, remains same, propane, $ns^{1-2}$, increases, six, propan-2-ol, $(n-1)d^{1-10}$, two, decreases, Clemmensen’s, Wolff-Kishner] The variation and magnitude of oxidation state in coordination complexes is due to the participation of inner ____ electrons in addition to outer ____ electrons.

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2024 · 1 mark · Fill inOpen: Fill in the blanks by choosing the appropriate word(s) from those given in the…
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [decreases, $\text{CN}^-$ ion, activation energy, catalyst, two, $\text{Fe}^{2+}$ ion, carbon, lattice energy, enzyme, five, double, halogen, triple, increases] The number of ions that will be produced when potassium ferrocyanide, $\text{K}_4[\text{Fe}(\text{CN})_6]$, dissolves in water is ____. This shows that ____ is the ligand in the coordination compound.

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