Which one of the following has an optical isomer?

(en = ethylenediamine)

[Zn(en) (NH³)²]²⁺
[Co(en)³]³⁺
[Co(H²O)⁴(en)]³⁺
[Zn(en)²]²⁺

A solution containing 2.675 g of CoCl³. 6 NH³(molar mass =267.5 g mol^–1) is passed through acation exchanger. 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)

[Co(NH³)⁶]Cl³
[CoCl²(NH³)⁴]Cl
[CoCl³(NH³)³]
[CoCl(NH³)⁵]Cl²

Solution

Which of the following pairs represent linkage isomers?

[Pd(PPh³)²(NCS)²] and [Pd( PPh³)²(SCN)²]
[Co(NH³)⁵NO³] SO⁴ and [Co(NH³)⁵SO⁴]NO³
[PtCl²(NH³)⁴] Br² and [Pt B²(NH³)⁴] Cl²
[Cu(NH³)⁴][Pt Cl⁴] and [Pt(NH³)⁴][CuCl⁴]

Solution

The SCN^-ion can coordinate through S or N atomgiving riseto linkage isomerism

M ← SCN thiocyanato

M ← NCS isothiocyanato.

The coordination number and the oxidation state of the element‘E’ in the complex[E (en)²²O⁴)]NO²(where(en)is ethylene diamine) are,respectively,

6 and 2
4 and 2
4 and 3
6 and 3

Solution

In the given complex we have two bidentate ligands(i.e en and C²O⁴),so coordination number of E is 6

(2 × 2 +1 × 2 = 6)

Let the oxidation state of E in complex be x, then

[x+ (–2) =1] or x – 2 = 1

or x= + 3, so its oxidation state is + 3

Thus option (d) is correct.

Which of the following has a square planar geometry?

(At. nos.: Fe = 26,Co = 27, Ni = 28, Pt = 78)

[PtCl⁴]^2-
[CoCl⁴]^2-
[FeCl⁴]^2-
[NiCl⁴]^2-

Solution

Complexes with dsp² hybridisation are square planar.So, [PtCl⁴]^2- is square planar in shape.

Low spin complex of d⁶-cation in an octahedral field will have the following energy :

\(\frac{-12}{5}\Delta _{0}+P\)
\(\frac{-12}{5}\Delta _{0}+3p\)
\(\frac{-2}{5}\Delta _{0}+2p\)
\(\frac{-2}{5}\Delta _{0}+p\)

Solution

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true ?

Red complex has a square planar geometry.
Complex has symmetrical H-bonding
Red complex has a tetrahedral geometry.
Dimethylglyoxime functions as bidentate ligand.

Solution

Which of the following complex compounds will exhibit highest paramagnetic behaviour?

(At. No. : Ti = 22, Cr = 24, Co = 27, Zn =30)

[Ti (NH³)⁶]³⁺
[Cr (NH³)⁶]³⁺
[Co (NH³)⁶]³⁺
[Zn (NH³)⁶]³⁺

Solution

The complex, [Pt(py)(NH³)BrCl] will have how many geometrical isomers ?

3
4
zero
2

Solution

The complexes [Co(NH³)⁶] [Cr(CN)⁶] and [Cr(NH³)⁶][Co(CN)⁶] are the examples of which type of isomerism?

Linkage isomerism
Ionization isomerism
Coordination isomerism
Geometrical isomerism

Solution

Coordination isomerism occurs when cationic and anionic complexes of different metal ions are present in a salt. The two isomers differ in the distribution of ligands in cation and anione.g.,[Co (NH³)⁶] [Cr (CN)⁶] is an isomer of [Co (CN)⁶][Cr (NH³)⁶]

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