Coordination Compounds

The number of optical isomers exhibited by the iron complex $(\mathrm{A})$ obtained from the following reaction is___________.
\(\mathrm{FeCl}_3+\mathrm{KOH}+\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4 \rightarrow \mathrm{~A}\)

\(\text { Match the LIST-I with LIST-II }\)


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The correct order of the complexes $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}(\mathrm{A}),\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}(\mathrm{B}),\left[\mathrm{Co}(\mathrm{CN...

Identify the diamagnetic octahedral complex ions from below ;
A. $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$
B. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$
C. $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$
D. $\left[\math...

A transition metal (M) among $\mathrm{Mn}, \mathrm{Cr}, \mathrm{Co}$ and Fe has the highest standard electrode potential $\left(\mathrm{M}^{3+} / \mathrm{M}^{2+}\right)$. It forms a metal complex of the type $\left[\mathrm{M}(\mathrm{CN})_6...

Given below are two statements :
Statement (I) : In octahedral complexes, when $\Delta_0<\mathrm{P}$ high spin complexes are formed. When $\Delta_0>P$ low spin complexes are formed.
Statement (II) : In tetrahedral complexes because of $\Del...

The spin-only magnetic moment value of $\mathrm{M}^{\mathrm{n}+}$ ion formed among $\mathrm{Ni}, \mathrm{Zn}, \mathrm{Mn}$ and Cu that has the least enthalpy of atomisation is_________ . (in nearest integer) Here n is equal to the number of...

The d-orbital electronic configuration of the complex among $\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+},\left[\mathrm{CoF}_6\right]^{3-}$, $\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$ and $\left[\mathrm{Zn}\left(\...

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

Match List - I with List - II.


List - I (Complex)
List - II (Hybridisation & Magnetic characters)


(A) [MnBr4]2-
(I) d2sp3 & diamagnetic


(B) [FeF6]3-
(II) sp3d2 & paramagnetic


(C) [Co(C2O4)3]...

The correct increasing order of stability of the complexes based on $\Delta_0$ value is :

I. $[\text{Mn}(\text{CN})_6]^{3-}$
II. $[\text{Co}(\text{CN})_6]^{4-}$
III. $[\text{Fe}(\text{CN})_6]^{4-}$
IV. $[\text{Fe}(\text{CN})_6]^{3-}$

Consider the following low-spin complexes
$$ \mathrm{K}_3\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_6\right], \mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right], \mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right], \mathrm{Cu}_2\left[\mat...

The calculated spin-only magnetic moments of $K_3[Fe(OH)_6]$ and $K_4[Fe(OH)_6]$ respectively are :

Identify the homoleptic complexes with odd number of $d$ electrons in the central metal :
(A) $\left[\mathrm{FeO}_4\right]^{2-}$
(B) $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$
(C) $\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]^{2-...

Total number of molecules/species from following which will be paramagnetic is __________. $\mathrm{O}_2, \mathrm{O}_2^{+}, \mathrm{O}_2^{-}, \mathrm{NO}, \mathrm{NO}_2, \mathrm{CO}, \mathrm{K}_2\left[\mathrm{NiCl}_4\right],\left[\mathrm{Co...

The spin only magnetic moment ( $\mu$ ) value (B.M.) of the compound with strongest oxidising power among $\mathrm{Mn}_2 \mathrm{O}_3, \mathrm{TiO}$ and VO is ____________ B.M. (Nearest integer).

Match List - I with List - II.

List - I (Complex)
List - II (Hybridisation of central metal ion)


(A) [CoF6]3-
(I) d2sp3


(B) [NiCl4]2-
(II) sp3


(C) [Co(NH3)6]3+
(III) sp3d2


(D) ...

One mole of the octahedral complex compound $\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}_3$ gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with excess of $\mathrm{AgNO}_3$ solution to yield two mo...

The conditions and consequence that favours the $t_{2 \mathrm{~g}}{ }^3 \mathrm{e}_{\mathrm{g}}{ }^1$ configuration in a metal complex are :

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be:

The d-electronic configuration of an octahedral Co (II) complex having magnetic moment of 3.95 BM is:

The complex that shows Facial - Meridional isomerism is :

$\mathrm{CrCl}_3 \cdot \mathrm{xNH}_3$ can exist as a complex. 0.1 molal aqueous solution of this complex shows a depression in freezing point of $0.558^{\circ} \mathrm{C}$. Assuming $100 \%$ ionisation of this complex and coordination numb...

Identify the coordination complexes in which the central metal ion has $\mathrm{d}^4$ configuration.
(A) $\left[\mathrm{FeO}_4\right]^{2-}$
(B) $\quad\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$
(C) $\left[\mathrm{Fe}(\mathrm{CN})_6\right]...

From the magnetic behaviour of $\left[\mathrm{NiCl}_4\right]^{2-}$ (paramagnetic) and $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ (diamagnetic), choose the correct geometry and oxidation state.

 In which of the following complexes the CFSE, $\Delta_o$ will be equal to zero?

The complex of $\mathrm{Ni}^{2+}$ ion and dimethyl glyoxime contains __________ number of Hydrogen (H) atoms.

Identify the homoleptic complex(es) that is/are low spin.
(A) $\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]^{2-}$
(B) $\left[\mathrm{CoF}_6\right]^{3-}$
(C) $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$
(D) $\left[\mathrm{Co}\left(\...

The correct order of the following complexes in terms of their crystal field stabilization energies is :

Number of ambidentate ligands among the following is _________.
\(\mathrm{NO}_2^{-}, \mathrm{SCN}^{-}, \mathrm{C}_2 \mathrm{O}_4^{2-}, \mathrm{NH}_3, \mathrm{CN}^{-}, \mathrm{SO}_4^{2-}, \mathrm{H}_2 \mathrm{O} \text {. }\)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The total number of geometrical isomers shown by \([\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2]^{+}\) complex ion is thr...

Consider the following test for a group-IV cation.
\(\mathrm{M}^{2+}+\mathrm{H}_2 \mathrm{S} \rightarrow \mathrm{A} \text { (Black precipitate)+ byproduct }\)
$$\mathrm{A}+\text { aqua regia } \rightarrow \mathrm{B}+\mathrm{NOCl}+\mathrm{S}...

The coordination environment of \(\mathrm{Ca}^{2+}\) ion in its complex with \(\mathrm{EDTA}^{4-}\) is :

Match List I with List II

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The 'spin only' magnetic moment value of \(\mathrm{MO}_4{ }^{2-}\) is ________ BM. (Where M is a metal having least metallic radii. among \(\mathrm{Sc}, \mathrm{Ti}, \mathrm{V}, \mathrm{Cr}, \mathrm{Mn}\) and \(\mathrm{Zn}\) ).
(Given atomi...

Given below are two statements:
Statement I: \(\mathrm{N}\left(\mathrm{CH}_3\right)_3\) and \(\mathrm{P}\left(\mathrm{CH}_3\right)_3\) can act as ligands to form transition metal complexes.
Statement II: As N and P are from same group, the ...

Match List I with List II

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Number of Complexes with even number of electrons in \(\mathrm{t_{2 g}}\) orbitals is -
$$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+},\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+},\left[\mathrm{...

An octahedral complex with the formula \(\mathrm{CoCl}_3 \cdot \mathrm{nNH}_3\) upon reaction with excess of \(\mathrm{AgNO}_3\) solution gives 2 moles of \(\mathrm{AgCl}\). Consider the oxidation state of \(\mathrm{Co}\) in the complex is ...

Total number of unpaired electrons in the complex ions \([\mathrm{Co}(\mathrm{NH}_3)_6]^{3+}\) and \([\mathrm{NiCl}_4]^{2-}\) is ________.

Match List I with List II

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Consider the following complexes
(A) \(\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}\), (B) \(\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}\), (C) $$
\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\ri...

The difference in the 'spin-only' magnetic moment values of \(\mathrm{KMnO}_4\) and the manganese product formed during titration of \(\mathrm{KMnO}_4\) against oxalic acid in acidic medium is ________ \(\mathrm{BM}\). (nearest integer)

Match List I with List II

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The correct IUPAC name of \([\mathrm{PtBr}_2(\mathrm{PMe}_3)_2]\) is :

Match List I with List II.

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Given below are two statements :
Statement I : \(\mathrm{PF}_5\) and \(\mathrm{BrF}_5\) both exhibit \(\mathrm{sp}^3 \mathrm{~d}\) hybridisation.
Statement II : Both \(\mathrm{SF}_6\) and \([\mathrm{Co}(\mathrm{NH}_3)_6]^{3+}\) exhibit $$\m...

The correct order of ligands arranged in increasing field strength.

The spin-only magnetic moment value of the ion among \(\mathrm{Ti}^{2+}, \mathrm{V}^{2+}, \mathrm{Co}^{3+}\) and \(\mathrm{Cr}^{2+}\), that acts as strong oxidising agent in aqueous solution is _________ BM (Near integer).
(Given atomic num...

Which one of the following complexes will exhibit the least paramagnetic behaviour ?
[Atomic number, \(\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27\)]