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Coordination Compounds — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds3 Marks
Question
Write down rules to write the formulas of Mononuclear coordination entities.
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Answer

(i) The central atom is listed first.
(ii) The ligands are then listed in alphabetical order. The placement of a ligand in the list does not depend on its charge.
(iii) Polydentate ligands are also listed alphabetically. In case of abbreviated ligand, the first letter of the abbreviation is used to determine the position of the ligand in the alphabetical order.
(iv) The formula for the entire coordination entity, whether charged or not, is enclosed in square brackets. When ligands are polyatomic, their formulas are enclosed in parentheses. Ligand abbreviations are also enclosed in parentheses.
(v) There should be no space between the ligands and the metal within a coordination sphere.
(vi) When the formula of a charged coordinationentity is to be written without that of the counterion, the charge is indicated outside the square brackets as a right superscript with the number before the sign. For example, $\left[ Co ( CN )_6\right]^{3-},[ Cr$ $\left.\left( H _2 O \right)_6\right]^{3+}$, etc.
(vii) The charge of the cations (s) is balanced by the charge of the anions (s).

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