Which of the following statements is/are correct?a)[Co(en)2NO2Cl]Br is cationic complexb)[Co(en)3]CI3 produces 3 ions in solutionc)[Fe(CO)5] is neutral complexd)[Cu(NH3)4]SO4 is deep blue colourCorrect answer is option 'A,C,D'. Can you explain this answer?

Question

Answer

Except B all are correct the compound in option B produces 4 ions in solution not 3

Answer

(a) is correct as charge on the complex ion will be +1
(b) is incorrect as the complex will form 4 ions in solution
(c) is correct as there is no charge on the complex
(d) is also correct as cu+2 has blue colour in solution

Answer

A) positive charge is on the ligand. so, it's a cationic complex
b)the complex produces 4 ions and not 3 ions. 3Cl- ions and 1 complex ion, so this is incorrect
c) [Fe(CO)5] is a neutral ligand as charge on Fe is zero. (because CO is neutral)
d) Here charge on Cu is +2. Generally Cu2+ compounds are deep blue in color. eg - CuCl2, CuSO4.5H2O, etc are blue in color

Answer

Statement a: [Co(en)2NO2Cl]Br is cationic complex

The given complex, [Co(en)2NO2Cl]Br, is formed by the coordination of cobalt (Co) with two molecules of ethylenediamine (en), one nitrate ion (NO2), and one chloride ion (Cl). The complex is then combined with a bromide ion (Br).

In this complex, the cobalt atom has a +3 oxidation state because it is coordinated with two neutral ethylenediamine molecules, which are bidentate ligands. Each ethylenediamine molecule donates two nitrogen atoms to form two coordination bonds with the cobalt atom. The nitrate ion (NO2) and chloride ion (Cl) also form coordination bonds with the cobalt atom.

Since the complex has a positive charge due to the presence of the bromide ion (Br-), it is indeed a cationic complex.

Statement c: [Fe(CO)5] is neutral complex

The given complex, [Fe(CO)5], is formed by the coordination of iron (Fe) with five carbon monoxide (CO) ligands. Each carbon monoxide molecule donates a lone pair of electrons to form a coordination bond with the iron atom.

In this complex, the iron atom has a 0 oxidation state because it is coordinated with five neutral carbon monoxide ligands, which are considered as zero charge ligands. The overall charge of the complex is therefore neutral.

Therefore, statement c is correct.

Statement d: [Cu(NH3)4]SO4 is deep blue colour

The given complex, [Cu(NH3)4]SO4, is formed by the coordination of copper (Cu) with four molecules of ammonia (NH3) ligands. Each ammonia molecule donates a lone pair of electrons to form a coordination bond with the copper atom.

In this complex, the copper atom has a +2 oxidation state because it is coordinated with four neutral ammonia ligands. The sulfate ion (SO4) does not directly coordinate with the copper atom.

The deep blue color of the complex is due to the presence of the copper atom, which has unpaired electrons in its d orbitals. This leads to the absorption of light in the red region of the visible spectrum, resulting in the blue color being observed.

Therefore, statement d is correct.

In conclusion, the correct statements are a, c, and d.

Similar Class 12 Doubts

Comprehension TypeDirection (Q. Nos. 16and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions have been related to the paragraph have been given. Each question has only one correct answer among the four given options (

Which of the following statements is not correct as per the nomenclature of coordination compounds is concerned?

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