AIIMS Chemistry Coordination Compounds Class 12 Questions

$\left[\text{Co}(\text{C}_2\text{O}_4)_3\right]^{3-}$ is a :

Which of the following does not give ppt with CrO₄²⁻

When $\text{Ag}^+$ reacts with excess of sodium-thio sulphate then the obtained species having charge & geometry respectively will be?

Which of the following complexes has maximum CFSE?

The Hybridisation and magnetic behavior of complex $\left[\text{Ni(CO)}_4\right]$ is :

In Fe(CO)₅ and Cr(CO)₆, how many CO ligands can be replaced by NO?

Correct increasing order for the wavelength of absorption in the visible region for the complexes of $\text{Co}^{3+}$ is:

$\text{C} + \text{O}_2(\text{g}) \rightarrow \text{CO}_2 \dots\dots(\text{i}); \quad \Delta\text{H} = -393 \text{ kJmol}^{-1}$

$\text{H}_2 + \frac{1}{2}\text{O}_2 \rightarrow \text{H}_2\text{O}, \dots\dots(\text{ii}); \quad \Delta\text{H} = -287.3 \text{ kJmol}^{-1}$

$2\text{CO}_2 + 3\text{H}_2\text{O} \rightarrow \text{C}_2\text{H}_5\text{OH} + 3\text{O}_2 \dots\dots(\text{iii}); \quad \Delta\text{H} = 1366.8 \text{ kJmol}^{-1}$

Find the standard enthalpy of formation of $\text{C}_2\text{H}_5\text{OH}(\text{l})$

Chloro compound of vanadium has only spin magnetic moment of 1.73 BM. This vanadium chloride has the formula:

Assertion : Potassium ferricyanide, $[\text{Fe}(\text{CN})_6]^{3-}$ is diamagnetic, while potassium ferrocyanide $[\text{Fe}(\text{CN})_6]^{4-}$ is paramagnetic.Reason : Oxidation state of $\text{Fe}$ in potassium ferricyanide is +2, but in potassium ferrocyanide its oxidation state is +3.

For the ions $\text{Zn}^{2+}$, $\text{Ni}^{2+}$ and $\text{Cr}^{3+}$ which among the following statements is correct? (Atomic number of Zn = 30, Ni = 28 and Cr = 24)

The IUPAC name for the complex $[\text{Co}(\text{NO}_2)(\text{NH}_3)_5]\text{Cl}_2$ is:

The molar ionic conductance of the octahedral complexes:

(i) $\text{PtCl}_4 \cdot 5\text{NH}_3$

(ii) $\text{PtCl}_4 \cdot 4\text{NH}_3$

(iii) $\text{PtCl}_4 \cdot 3\text{NH}_3$

(iv) $\text{PtCl}_4 \cdot 2\text{NH}_3$

Follow the order

$\text{Cr}^{+3}$ in aqueous medium form green coloured complex with $\text{NH}_3$ ligand. How many ligand associated

[Cr(CO)₆] + NO (excess) → Product

Which of the following give good synergic bond with metal

In which of the following elements the number of ‘d’ is zero?

Assertion: [Co(NH₃)₆]³⁺ → [Co(NH₃)₅H₂O]³⁺ colour continuously changes. Reason: Larger wavelength will be absorbed

When an aqueous solution of copper (II) sulphate is saturated with ammonia, the blue compound crystallises on evaporation. The formula of this blue compound is:

Assertion : $[\text{Cr}(\text{H}_2\text{O})_6]^{+2} \rightarrow [\text{Cr}(\text{H}_2\text{O})_6]^{+3}$ while converting, colour continuously changes.

Reason : CFSE is increases during change.

Select correct match

Assertion: When one solvent mixed with other solvent, vapour pressure of one increases and other decreases

Reason: When any solute added into solvent, vapour pressure of solvent decreases

Assertion: [Co(NH₃)₆]³⁺ and [Co(en)₃]³⁺ are more stable complex. Reason: They are low spin complex.

Assertion: In zieses salt coordination no. of Pt is five

Reason: ethene is bidentate ligand.

The correct statement on the isomerism associated with the following complex ions,

A. $[\text{Ni}(\text{H}_2\text{O})_5 \text{NH}_3]^{2+}$

B. $[\text{Ni}(\text{H}_2\text{O})_4(\text{NH}_3)_2]^{2+}$ and

C. $[\text{Ni}(\text{H}_2\text{O})_3(\text{NH}_3)_3]^{2+}$ is:

Assertion : Both $\text{Be}$ and $\text{Al}$ can form complexes such as $\text{BeF}_4^{2-}$ and $\text{AlF}_6^{3-}$ respectively. $\text{BeF}_6^{3-}$ is not formed.

Reason : In case of $\text{Be}$, no vacant d-orbitals are present in its outermost shell.

Assertion: Both Be and Al can form complexes such as BeF₄²⁻ and AlF₆³⁻ respectively. BeF₆³⁻ is not formed. Reason: In case of Be, no vacant d-orbital are present in its outermost shell.

Assertion (A): Complexes of $\text{MX}_6$ and $\text{MX}_5\text{L}$ type ($\text{X}$ and $\text{L}$ are unidentate) do not show geometrical isomerism.

Reason (R): Geometrical isomerism is not shown by complexes of coordination number 6.

Select the correct statement.

Assertion : Co[Hg(SCN)₆] and Hg[Co(SCN)₆] are isomers. Reason : SCN⁻ is a stronger ligand as compared to NCS⁻

Consider the following arrangements of the octahedral complex ion [Co(NH₃)₄Cl₂]⁺. Which of the following statements is false?

[Fe(H₂O)₅NO]²⁺ is a complex formed during the brown ring test for NO₃⁻ ion. In this complex.

Which one amongst of the following isomerism is shown by [Pt(NH₃)₂Cl₂]?

An octahedral complex is formed when hybrid orbitals of the following types are involved.

A solution containing 0.319 g of CrCl₃ · 6H₂O was passed through a cation exchange resin and acid coming out of the cation exchange resin required 28.5 mL of 0.125 M NaOH. Determine correct formula of the complex [mol. wt. of the complex = 266.5]

Assertion [Ni(Co)4] is a diamagnetic complex. Reason All the electrons in the complex are paired.

Which of the following metal ion forms unstable complex with CN⁻?

Assertion : EDTA forms complex with divalent metals of 3d-series in the ratio of 1:1. Reason : EDTA has 4 –COOH groups.

Assertion : In a mixture of CdCl₂ and CuCl₂, Cd²⁺ gets precipitated in presence of KCN by H₂S. Reason : The stability constant of [Cu(CN)₄]²⁻ is greater than [Cd(CN)₄]²⁻.

Assertion: Aq. solution of CoCl₂ is pink in colour. It turns blue in presence of conc. HCl. Reason: It is due to the formation of [CoCl₄]²⁻.

What is the oxidation state of iron in haemoglobin?

Magnetic moment of Cr²⁺ is nearest to

Assertion: $\text{F}^-$ ion is a weak ligand and forms outer orbital complex. Reason: $\text{F}^-$ ion cannot force the electrons of $d_{z^2}$ and $d_{x^2 - y^2}$ orbitals of the inner shell to occupy $d_{xy}$, $d_{yz}$ and $d_{zx}$ orbitals of the same shell.

Assertion: $[\text{Fe}(\text{H}_2\text{O})_5\text{NO}]\text{SO}_4$ is paramagnetic. Reason: The Fe in $[\text{Fe}(\text{H}_2\text{O})_5\text{NO}]\text{SO}_4$ has three unpaired electrons.

The wavelength of light absorbed is shortest in

Which of the following is diamagnetic?

Assertion : AgCl is more soluble in NH₃ than in water. Reason : Ammonia is more polar than water.

Match list I with list II and select the correct answer using the codes given below the lists.

A complex PtCl₄.5NH₃ shows a molar conductance of 402 Ω⁻¹ cm² mol⁻¹ in water and precipitates three moles of AgCl with AgNO₃ solution. The formula of the complex is

Assertion: The degree of complex formation in actinides decreases in the order M⁴⁺ > MO₂²⁺ > M³⁺ > MO₂⁺. Reason: Actinides form complexes with π-bonding ligands such as alkyl phosphines and thioethers.