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Home Questions VWCKRX7W2P
Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: Coordination Compounds

Question:

The formula of the complex tris (ethylenediamine) cobalt (III) sulphate is

Options:

[Co(en)3]SO4

[Co(en)3 SO4]

[Co(en)3]2 (SO4)3

[Co(en)3] (SO4)3

Correct Answer:

[Co(en)3]2 (SO4)3

Explanation:

The correct formula of the complex tris (ethylenediamine) cobalt (III) sulphate is (3) [Co(en)3]2(SO4)3.

The complex has a central cobalt atom with a coordination number of 6. It is bonded to three ethylenediamine ligands and three sulfate ligands. The oxidation state of the cobalt atom is +3.

The formula for the complex follows the following rules:

  • The ligands are named in alphabetical order, regardless of their charge.
  • The name of the central atom is followed by its oxidation state in parentheses.
  • The ligands are named in their uncharged form, with the suffix "o" added if they are negatively charged.
  • If the complex contains more than one of the same ligand, the number of ligands is indicated by a prefix. For example, two chloride ligands would be named "dichloro".

Therefore, the formula of the complex is [Co(en)3]2(SO4)3. The other options are incorrect because they do not follow the IUPAC naming conventions.

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