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The compound having tetrahedral geometry is
1. ${\left[Ni{\left(CN\right)}_4\right]}^{2-}$
2. ${\left[Pd{\left(CN\right)}_4\right]}^{2-}$
3. ${\left[PdC{l}_4\right]}^{2-}$
4. ${\left[NiC{l}_4\right]}^{2-}$

Spin only magnetic moment of the compound $Hg\left[Co{\left(SCN\right)}_4\right]$ is
1. $\sqrt{3}$
2. $\sqrt{15}$
3. $\sqrt{24}$
4. $\sqrt{8}$

Which kind of isomerism is exhibited by octahedral Co(NH₃)₄Br₂Cl?
1. Geometrical and ionization
2. Geometrical and optical
3. Optical and ionization
4. Geometrical only

Which pair of compounds is expected to show similar colour in aqueous medium?
1. $FeC{l}_3 and CuC{l}_2$
2. $VOC{l}_2 and CuC{l}_2$
3. $VOC{l}_2 and FeC{l}_2$
4. $FeC{l}_2 and MnC{l}_2$

$CuS{O}_4$ decolourises on addition of excess KCN, the product is
1. ${\left[Cu{\left(CN\right)}_4\right]}^{2-}$
2. ${\left[Cu{\left(CN\right)}_4\right]}^{3-}$
3. $Cu{\left(CN\right)}_2$
4. CuCN

If the bond length of CO bond in carbon monoxide is 1.128 $\stackrel{0}{A}$, then what is the value of CO bond length is $Fe{\left(CO\right)}_5$ ?
1. 1.15 $\stackrel{0}{A}$
2. 1.128 $\stackrel{0}{A}$
3. 1.72 $\stackrel{0}{A}$
4. 1.118 $\stackrel{0}{A}$

Among the following metal carbonyls, the C-O bond order is lowest in
1. ${\left[Mn{\left(CO\right)}_6\right]}^{+}$
2. $\left[Fe{\left(CO\right)}_5\right]$
3. $\left[Cr{\left(CO\right)}_6\right]$
4. ${\left[V{\left(CO\right)}_6\right]}^{-}$

Sodium-fusion extract, obtained from aniline, on treatment with iron (II) sulphate and $H_{2}S{O}_4$ in presence of air gives a Prussian blue precipitate. The blue colour is due to the formation of
(1) $F{e}_4[Fe{\left(CN\right)}_6{]}_3$
(2) $F{e}_3[Fe{\left(CN\right)}_6{]}_2$
(3) $F{e}_4[Fe{\left(CN\right)}_6{]}_2$
(4) $F{e}_3[Fe{\left(CN\right)}_6{]}_3$

Both $\left[Ni{\left(CO\right)}_4\right] and [Ni{\left(CN\right)}_4{]}^{2-}$ are diamagnetic. The hybridizations of nickel in these complexes, respectively, are
(1) $s{p}^3,{ sp}^3$
(2) $s{p}^3, ds{p}^2$
(3) $ds{p}^2, s{p}^3$
(4) $ds{p}^2, ds{p}^2$

Geometrical shapes of the complexes formed by the reaction of $N{i}^{2+} with C{l}^{-}, C{N}^{-} and H_{2}O$ respectively, are
1. Octahedral, tetrahedral and square planar
2. Tetrahedral, square planar and octahedral
3. Square planar, tetrahedral and octahedral
4. Octahedral, square planar and octahedral

Among the following complexes (K-P)
$K_3\left[Fe{\left(CN\right)}_6\right(K), [Co{\left(N{H}_3\right)}_{6}C{l}_3\left(L\right),$
$N{a}_3\left[Co{\left(oxalate\right)}_3\right]\left(M\right), \left[Ni{\left(H_{2}O\right)}_6\right]C{l}_2 \left(N\right),$
$K_2\left[Pt{\left(CN\right)}_4\right(O) and [Zn{\left(H_{2}O\right)}_6]{\left(N{O}_3\right)}_2 (P)$
The diamagnetic complexes are-
(1) K, L, M, N
(2) K, M, O, P
(3) L, M, O, P
(4) L, M, N, O

The volume (in mL) of 0.1 M AgNO3 required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of [Cr(H₂O)₅Cl]Cl₂, as silver chloride is close to
1. 4
2. 6
3. 20
4. 60

NiCl₂{P(C₂H₅)₂(C₆H₅)}₂ exhibits temperature dependent magnetic behaviour (paramagnetic/diamagnetic). The coordination geometries of $N{i}^{2+}$ in the paramagnetic and diamagnetic states are respectivelu :
1. Tetrahedral and tetrahedral
2. square planar and square planar
3. Tetrahedral and square planar
4. Square planar and tetrahedral

Consider the following complex ions P, Q and R,
P = ${\left[{\mathrm{FeF}}_6\right]}^{3-}$
Q = ${\left[\mathrm{V}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$
and R= ${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$
The correct order of the complex ions, according to their spin-only magnetic moment values (in B.M.) is:
1. R<Q<P
2. Q<R<P
3. R<P<Q
4. Q<P<R

In [Cr(C₂O₄)₃]^3-, the isomerism shown is
(1) Ligand
(2) Optical
(3) Geometrical
(4) Ionization

In the complexes [Fe(H₂O)₆]³⁺, [Fe(SCN)₆]^3-, [Fe(C₂O₄)3]^3- and [FeCl₆]^3-, more stability is shown by
1. [Fe(H₂O₆]³⁺
2. $[Fe{\left(SCN\right)}_6{]}^{-3}$
3 [Fe(C₂O₄)₃]^3-
4. [FeCl₆]^3-

One mole of the complex compound Co(NH₃)₅Cl₃, gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of $AgN{O}_3$ solution to yield two moles of AgCl(s). The structure of the complex is
(1) [Co(NH₃)₃Cl₃].2NH₃
(2) [Co(NH₃)₄Cl₂Cl.NH₃
(3) [Co(NH₃)₄Cl]Cl₂.NH₃
(4) [Co(NH₃)₅Cl]Cl₂

Ammonia forms the complex ion [Cu(NH₃)₄]²⁺ with copper ions in alkaline solutions but not in acidic solution. What is the reason for it?
1. In acidic solutions hydration protects copper ions
2. In acidic solutions protons coordinate with ammonia molecules forming ions and $N{H}_3$ molecules are not available
3. In alkaline solutions insoluble $Cu{\left(OH\right)}_2$ is precipitated which is soluble in excess of any alkali
4. Copper hydroxide is an amphoteric substance

In the context of biological systems, coordination compounds play a crucial role;
identify the incorrect statement from the provided options.

For octahedral complex, the value of the 'spin only' magnetic moment for one of the following configuration is 2.84 BM. The correct one is:
1. d⁴ (in strong ligand field)
2. d⁴ (in weak ligand field)
3. d³ (in weak as well as in strong field)
4. d⁵ (in strong ligand field)

Nickel (Z=28) combines with a uninegative monodentate ligand X - to form a paramagnetic complex [NiX₄]^2-. The number of unpaired electron in the nickel and geometry of this complex ion are, respectively
(1) One, square planar
(2) Two, square planar
(3) One, tetrahedral
(4) Two, tetrahedral

In Fe (CO)₅, the Fe-C bond possesses
1. ionic character
2. $\sigma$-character only
3. $\pi$-character only
4. both $\sigma$ and $\pi$ character

The "spin-only" magnetic moment [in units of Bohr magneton, (${\mu }_B$)] of Ni²⁺ in aqueous solution would be
(At. No. Ni=28)
(1) 0
(2) 1.73
(3) 2.84
(4) 4.90

In which of the following octahedral complexes of Co (at. no. 27), CFSE will be the highest?
(1) [Co(CN)₆]^3-
(2) [Co(C₂O₄)₃]^3-
(3) [Co(H₂O)₆]³⁺
(4) [Co(NH₃)₆]³⁺

Which of the following pairs represents linkage isomers?
1. [Co(NH₃)₅NO₃]SO₄ and [Co(NH₃)₅SO₄]NO₃
2. [PtCl₂)(NH₃)₄]Br₂ and [PtBr₂(NH₃)₄]Cl₂
3. [Cu(NH₃)₄[PtCl₄] and [Pt(NH₃)₄][CuCl₄]
4. [Pd(PPh₃)₂(NCS)₂ and [Pt(PPh₃)₂(SCN)₂]

A solution containing 2.675 g of CoCl₃.6NH₃ (molar mass=267.5 g mol-1) is passed through a cation exhanger. The chloride ions obtained in solution were treated with excess of AgNO₃ to give 4.78 g of AgCl (molar mass = 143.5 g mol-1). The formula of the complex is
(At. mass of Ag = 108 u)
1. [CoCl(NH₃)₅]Cl₂
2. [Co(NH₃)₆Cl₃
3. [CoCl₂(NH₃)₄]Cl
4. [CoCl₃(NH₃)₃]

Which of the following facts about the complex [Cr(NH₃)₆]Cl₃ is wrong?
1. The complex is an ourter orbital complex
2. The complex gives white precipitate with silver nitrate solution
3. The complex involves d²sp³ hybridization and is octahedral in shape
4. The complex is paramagnetic

Which of the following complex species is not expected to exhibit optical isomerism?
(1) [Co(en)₃]³⁺
(2) [Co(en)₂Cl₂]⁺
(3) [Co(NH₃)₃Cl₃]
(4) [Co(en)(NH₃)₂Cl₂]⁺

An ion M²⁺, forms the complexes [M(H₂O)₆]²⁺, [M(en)₃]²⁺ and [MBr₆]^4-, Match the complex with the appropriate colour
(1) Green, blue and red
(2) Blue, red and greed
(3) Green, red and blue
(4) Red, blue and green

Which of the following statement(s) is not correct?
(1) The complexes [NiCl₄]^2- and [Ni(CN)₄]^2- differ in the magnetic properties
(2) The complexes [NiCl₄]^2- and [NiCN₄]^2- differ in the geometry
(3) The complexes [NiCl₄]^2- and [NiCN₄]^2- differ in primary valencies of nickel
(4) The complexes [NiCl₄]^2- and [NiCN₄]^2- differ in the state of hybridization of nickel