Coordination Compounds

The total number of all possible isomers for the square planar complex with formula $\ce{K[M(NCS)(NO2)(gly)]}$ is ____.

(M = metal ion and gly = $\ce{NH2CH2COO-}$)

Consider that the coordinating atoms of the ligands in cis-$\ce{[Co(NH3)4Cl2]Cl}$ and mer-$\ce{[Co(NH3)3Cl3]}$ octahedral complexes are at the vertices of an octahedron. The sum of total number of the triangular faces in both the complexes having one N atom and two Cl atoms at their corners is ____.

Match List - I with List - II.

Choose the correct answer from the options given below :

5.33 g of $\ce{CrCl3.6H2O}$, which is a 1 : 3 electrolyte, is dissolved in water and is passed through a cation exchanger. The chloride ions in the eluted solution, on treatment with $\ce{AgNO3}$ results in 8.61 g of AgCl. The ratio of moles of complex reacted and moles of AgCl formed is ________ $\times10^{-2}$. (Nearest integer)
[Molar mass in g mol$^{-1}$ Cr : 52, Ag : 108, Cl : 35.5, H : 1, O : 16]

Given below are two statements :

Statement I : Among Zn, Mn, Sc and Cu, the energy required to remove the third valence electron is highest for Zn and lowest for Sc.

Statement II : The correct order of the following complexes in terms of CFSE is $\ce{[Co(H2O)6]^{2+}} < \ce{[Co(H2O)6]^{3+}} < \ce{[Co(en)3]^{3+}}$.

In the light of the above statements, choose the correct answer from the options given below :

Which of the following complexes will show coordination isomerism ?

A. $\ce{[Ag(NH3)2][Ag(CN)2]}$

B. $\ce{[Co(NH3)6][Cr(CN)6]}$

C. $\ce{[Co(NH3)6][Co(CN)6]}$

D. $\ce{[Fe(NH3)6][Co(CN)6]}$

E. $\ce{[Co(NH3)6][Fe(CN)6]}$

Choose the correct answer from the options given below :

Match the LIST-I with LIST-II

Choose the correct answer from the options given below:

Consider the metal complexes $\ce{[Ni(en)3]^{2+}}$ (A), $\ce{[NiCl4]^{2-}}$ (B) and $\ce{[Ni(NH3)6]^{2+}}$ (C). Choose the CORRECT option by considering the number of unpaired electrons present in (A), (B) and (C) respectively and the order of frequency of absorption.

The correct statements about metal carbonyls are

A. The metal-carbon bonds in metal carbonyls possess both σ and π-character.

B. Due to synergic bonding interactions between metal and CO ligand, the metal-carbon bond becomes weak.

C. The metal-carbon σ bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of metal.

D. The metal-carbon π bond is formed by the donation of electrons from filled d-orbital of metal into vacant π* orbital of CO.

Choose the correct answer from the options given below:

Given below are two statements:

Statement I: Each electron in $e_g$ orbitals destabilizes the orbitals by $+0.6\,\Delta_o$ and each electron in the $t_{2g}$ orbitals stabilizes the orbitals by $-0.4\,\Delta_o$ in an octahedral field on the basis of crystal field theory.

Statement II: All the d-orbitals of the transition metals have the same energy in their free atomic state but when a complex is formed the ligands destroy the degeneracy of these orbitals on the basis of crystal field theory.

In the light of the above statements, choose the correct answer from the options given below

Given below are two statements :

Statement I: Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation.

Statement II: $d_{xy}=d_{xz}=d_{yz}<d_{x^2-y^2}=d_{z^2}$ and $d_{x^2-y^2}=d_{z^2}<d_{xy}=d_{xz}=d_{yz}$ are the d-orbital splittings in $\ce{[Fe(H2O)6]^3+}$ and $\ce{[NiCl4]^2-}$ complex ions respectively.

In the light of the above statements, choose the correct answer from the options given below :

Identify the correct statements from the following

A. $\ce{[Fe(C2O4)3]^3-}$ is the most stable complex among $\ce{[Fe(OH)6]^3-}$, $\ce{[Fe(C2O4)3]^3-}$ and $\ce{[Fe(SCN)6]^3-}$

B. The stability of $\ce{[Cu(NH3)4]^2+}$ is greater than that of $\ce{[Cu(en)2]^2+}$

C. The hybridization of Fe in $\ce{K4[Fe(CN)6]}$ is $d^2sp^3$

D. $\ce{[Fe(NO2)3Cl3]^3-}$ exhibits linkage isomerism

E. $\ce{NO2-}$ and $\ce{SCN-}$ ligands are NOT ambidentate ligands

Choose the correct answer from the options given below :

The total number of unpaired electrons present in the $d^3$, $d^4$ (low spin) $d^5$ (high spin), $d^6$ (high spin) and $d^7$ (low spin) octahedral complex systems is ________.

Match the LIST-I with LIST-II

Choose the correct answer from the options given below:

Which of the following are true about the energy of the given d-orbitals of a tetrahedral complex?

A. $d_{xy}=d_{xz}>d_{x^2-y^2}$

B. $d_{xy}=d_{yz}>d_{z^2}$

C. $d_{x^2-y^2}>d_{z^2}>d_{xz}$

D. $d_{x^2-y^2}=d_{z^2}<d_{xz}$

Choose the correct answer from the given below:

Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ?

A. $\ce{[NiCl4]^2-}$ - $sp^3$, tetrahedral, paramagnetic

B. $\ce{[Ni(NH3)6]^2+}$ - $sp^3d^2$, octahedral, paramagnetic

C. $\ce{[Ni(CO)4]}$ - $sp^3$, tetrahedral, paramagnetic

D. $\ce{[Ni(CN)4]^2-}$ - $dsp^2$, square planar, diamagnetic

Choose the correct answer from the options given below :

An excess of $\ce{AgNO3}$ is added to 100 mL of a 0.05 M solution of tetraaquadichloridochromium (III) chloride. The number of moles of AgCl precipitated will be ________ $\times10^{-3}$. (Nearest integer)

Number of paramagnetic complexes among the following is ________.

$\ce{[MnBr4]^2-}$, $\ce{[NiCl4]^2-}$, $\ce{[Ni(CN)4]^2-}$, $\ce{[Ni(CO)4]}$, $\ce{[CoF6]^3-}$, $\ce{[Fe(CN)6]^4-}$, $\ce{[Mn(CN)6]^3-}$, $\ce{[Ti(CN)6]^3-}$, $\ce{[Cu(H2O)6]^2+}$, $\ce{[Co(C2O4)3]^3-}$

The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given complexes is

During sodium nitroprusside test of sulphide ion in an aqueous solution, one of the ligands coordinated to the metal ion is converted to