Coordination Compounds — JEE Main PYQs

The calculated magnetic moments (spin only value) for species ${\left[{\mathrm{FeCl}}_4\right]}^{2-}$, ${\left[\mathrm{Co}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$ and ${\mathrm{MnO}}_4^{2-}$ respectively are:

Spin only magnetic moment of an octahedral complex of ${\mathrm{Fe}}^{2+}$ in the presence of a strong field ligand in BM is :

Which one of the following species doesn't have a magnetic moment of 1.73 BM, (spin only value)?

An aqueous solution of ${\mathrm{NiCl}}_2$ was heated with excess sodium cyanide in presence of strong oxidizing agent to form ${\left[\mathrm{Ni}(\mathrm{CN}{)}_6\right]}^{2-}$. The total change in number of unpaired electrons on metal centre is ____ .

The number of optical isomers possible for ${\left[\mathrm{Cr}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$ is ____.

The hybridization and magnetic nature of ${\left[\mathrm{Mn}(\mathrm{CN}{)}_6\right]}^{4-}$ and ${\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{3-}$, respectively are:

The total number of unpaired electrons present in $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_2$ and $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3$ is ___.

Number of bridging CO ligands in $\left[{\mathrm{Mn}}_2(\mathrm{CO}{)}_{10}\right]$ is ____

Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is:

1 mol of an octahedral metal complex with formula ${\mathrm{MCl}}_3\cdot 2\mathrm{L}$ on reaction with excess of ${\mathrm{AgNO}}_3$ gives 1 mol of AgCl . The denticity of Ligand L is ____ (integer answer)

The number of moles of $\mathrm{NH}{}_3$, that must be added to 2 L of $0.80\mathrm{M}\mathrm{AgNO}{}_3$ in order to reduce the concentration of $\mathrm{Ag}{}^{+}$ ions to $5.0\times 10^{-8}\mathrm{M}$ ($K_{\text{formation}}$ for $[\mathrm{Ag}(\mathrm{NH}{}_3){}_2{]}^{+}=1.0\times 10^8$) is ______. (Nearest intege …

The number of stereoisomers possible for

____
[ox = oxalate]

Spin only magnetic moment in BM of [Fe(CO)₄(C₂O₄)]⁺ is :

The denticity of an organic ligand, biuret is :

The number of geometrical isomers found in the metal complexes $\left[{\mathrm{PtCl}}_2{\left({\mathrm{NH}}_3\right)}_2\right]$, $\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$, $\left[\mathrm{Ru}{\left({\mathrm{H}}_2\mathrm{O}\right)}_3{\mathrm{Cl}}_3\right]$ and …

The type of hybridisation and magnetic property of the complex ${\left[{\mathrm{MnCl}}_6\right]}^{3-}$, respectively, are:

The number of geometrical isomers possible in triamminetrinitrocobalt(III) is X and in trioxalatochromate(III) is Y. Then the value of $\mathrm{X}+\mathrm{Y}$ is ______.

Which one of the following species responds to an external magnetic field?

Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula ${\mathrm{CrCl}}_3\cdot 3{\mathrm{NH}}_3\cdot 3{\mathrm{H}}_2\mathrm{O}$ reacts with excess of silver nitrate. The number of chloride ions satisfying the secon …

Given below are two statements:
Statement I : ${\left[\mathrm{Mn}(\mathrm{CN}{)}_6\right]}^{3-},{\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]}^{3-}$ and ${\left[\mathrm{Co}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$ ared ${}^2{\mathrm{sp}}^3$ hybridised
Statement II : …

3 moles of metal complex with formula $\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_3$, gives 3 moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of Co in the complex is ____. (Round off to the Nearest Integer).

The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion $\left({\mathrm{M}}^{\mathrm{Z}+}\right)$ are $-0.8{\Delta }_0$ and 3.87 BM, respectively. Identify $\left({\mathrm{M}}^{\mathrm{Z}+}\right)$:

The potassium ferrocyanide solution gives a Prussian blue colour, when added to:

The sum of oxidation states of two silver ions in $\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]\left[\mathrm{Ag}(\mathrm{CN}{)}_2\right]$ complex is ____.

The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of ${\mathrm{CoCl}}_3$. $4{\mathrm{NH}}_3$ is ____ .
(Round off to the Nearest Integer).

${\left[\mathrm{Ti}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$ absorbs light of wavelength 498 nm during a d-d transition. The octahedral splitting energy for the above complex is _____ $\times 10^{-19}\mathrm{J}$. (Round off to the nearest integer). …

The secondary valency and the number of hydrogen bonded water molecule(s) in ${\mathrm{CuSO}}_4.5{\mathrm{H}}_2\mathrm{O}$ respectively, are:

Match List - I with List - II:
List - I
List - II
(a) $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]\left[\mathrm{Cr}(\mathrm{CN}{)}_6\right]$
(i) Linkage isomerism
(b) $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\left({\mathrm{NO}}_2\right)}_3\right]$
(ii) Solv …

On complete reaction of ${\mathrm{FeCl}}_3$ with oxalic acid in aqueous solution containing KOH, resulted in the formation of product A. The secondary valency of Fe in the product A is ______.
(Round off to the nearest integer).

Match List - I with List - II

List - I:
(a) Chlorophyll
(b) Vitamin - ${\mathrm{B}}_{12}$
(c) Anticancer drug
(d) Grubbs catalyst

List - II:
(i) Ruthenium
(ii) Platinum
(iii) Cobalt
(iv) Magnesium

Choose the most appropriate answer from the options given below:

The correct structures of trans-$\left[{\mathrm{NiBr}}_2{\left({\mathrm{PPh}}_3\right)}_2\right]$ and meridonial-$\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\left({\mathrm{NO}}_2\right)}_3\right]$, respectively, are :

The total number of unpaired electrons present in the complex ${\mathrm{K}}_3\left[\mathrm{Cr}(\text{ oxalate }{)}_3\right]$ is ____ .

The spin only magnetic moments (in BM) for free Ti³⁺, V²⁺ and Sc³⁺ ions respectively are (At. No. Sc: 21; Ti: 22; V: 23)

Which one of the following metal complexes is most stable? [coordination-complex formulas shown as options in source]

The theory that can completely/properly explain the nature of bonding in $\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$ is

The IUPAC name of the complex is $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_2\mathrm{Cl}\left({\mathrm{NH}}_2{\mathrm{CH}}_3\right)\right]\mathrm{Cl}$ is

The number of possible optical isomers for the complexes ${\mathrm{MA}}_2{\mathrm{B}}_2$ with ${\mathrm{sp}}^3$ and ${\mathrm{dsp}}^2$ hybridized metal atom, respectively is:
[Note: A and B are unidentate neutral and unidentate monoanionnic ligands, respectively]

Among the statements $(\mathrm{a}-\mathrm{d})$, the incorrect ones are:
(a) Octahedral Co (III) complexes with strong field ligands have very high magnetic moments
(b) When ${\Delta }_0<\mathrm{P}$, the d-electron configuration of Co (III) in an octahedral complex is …

The complex that can show fac- and mer-isomers is :

The volume (in mL ) of $0.125\mathrm{M}{\mathrm{AgNO}}_3$ required to quantitatively precipitate chloride ions in 0.3 g of $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_3$ is ____ …

Among (a) - (d), the complexes that can display geometrical isomerism are:
(a) $\left[\mathrm{Pt}{\left({\mathrm{NH}}_3\right)}_3\right]{\mathrm{Cl}}^{+}$
(b) ${\left[\mathrm{Pt}\left({\mathrm{NH}}_3\right){\mathrm{Cl}}_5\right]}^{-}$
(c) …

The correct order of the calculated spin-only magnetic moments of complexes (A) to (D) is :
(a) $\mathrm{Ni}(\mathrm{CO}{)}_4$
(b) $\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_2$
(c) …

Complexes $\left({\mathrm{ML}}_5\right)$ of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal geometries, respectively. The sum of the $90^{\circ },120^{\circ }$ and $180^{\circ }\mathrm{L}-\mathrm{M}-\mathrm{L}$ angles in the two complexes is ____

The correct order of the spin-only magnetic moments of the following complexes is:
(I) $\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Br}}_2$
(II) ${\mathrm{Na}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$
(III) …

The isomer (s) of $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]$ that has/have a $\mathrm{Cl}-\mathrm{Co}-\mathrm{Cl}$ angle of $90^{\circ }$, is/are :

If the magnetic moment of a dioxygen species is $1.73B.M$, it may be:

$[\mathrm{Pd}(F)(Cl)(Br)(I){]}^{2-}$ has $n$ number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy [CFSE] of $[\mathrm{Fe}(\mathrm{CN}{)}_6{]}^{n-6}$, respectively, are:
[Note: Ignore the pairing energy]

Complex X of composition $\mathrm{Cr}({\mathrm{H}}_2\mathrm{O}{)}_6{\mathrm{Cl}}_n$ has a spin only magnetic moment of 3.83 BM. It reacts with ${\mathrm{AgNO}}_3$ and shows geometrical isomerism. The IUPAC nomenclature of X is:

Consider the complex ions, trans $-{\left[\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_2\right]}^{+}(\mathrm{A})$ and cis $-{\left[\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_2\right]}^{+}$ (B). The correct statement regarding them is:

Considering that ${\Delta }_0>\mathrm{P}$, the magnetic moment (in BM ) of ${\left[\mathrm{Ru}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ would be
____ .