Question
Write down rules to write the formulas of Mononuclear coordination entities.
✓
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).
(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).
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
How would you account for the following:
→- Among lanthanoids, Ln (III) compounds are predominant. However, occasionally in solutions or in solid compounds, $+2$ and $+4$ ions are also obtained.
- The $E^o_{M^{2+}/M}$ for copper is positive $(0.34V)$. Copper is the only metal in the first series of transition elements showing this behaviour.
- The metallic radii of the third $(5d)$ series of transition metals are nearly the same as those of the corresponding members of the second series.
If the radius of the octahedral void is r and radius of the atoms in closepacking is R, derive relation between r and R.
Consider the decomposition of hydrogen peroxide in alkaline medium which is catalysed by iodide ions.
$\text{2H}_2\text{O}_2\xrightarrow{\text{OH}^-}2\text{H}_2\text{O}+\text{O}_2$
This reaction takes place in two step as given below:
Step-I $\text{H}_2\text{O}_2+\text{I}^-\rightarrow\text{H}_2\text{O}_2+\text{IO}^-\text{ (slow)}$
Step-II $\text{H}_2\text{O}_2+\text{IO}^-\rightarrow\text{H}_2\text{O}_2+\text{I}+\text{O}_2\text{ (fast})$
→$\text{2H}_2\text{O}_2\xrightarrow{\text{OH}^-}2\text{H}_2\text{O}+\text{O}_2$
This reaction takes place in two step as given below:
Step-I $\text{H}_2\text{O}_2+\text{I}^-\rightarrow\text{H}_2\text{O}_2+\text{IO}^-\text{ (slow)}$
Step-II $\text{H}_2\text{O}_2+\text{IO}^-\rightarrow\text{H}_2\text{O}_2+\text{I}+\text{O}_2\text{ (fast})$
- Write the rate law expression and determine the order of reaction w.r.t. $H_2O_2$.
- What is the molecularity of each individual step?
Three electrolytic cells A, B, C containing solutions of $ZnSO_4, AgNO_3$ and $CuSO_4$, respectively are connected in series. A steady current of $1.5$ amperes was passed through them until $1.45 g$ of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited?
→A first order reaction has a rate constant of $0.0051\ min^{–1}$. If we begin with $0.10\ M$ concentration of the reactant, what concentration of reactant will remain in solution after $3$ hours?
→An organic compound gives hydrogen on reacting with sodium metal. It also gives iodofom test and the end product of its oxidation is ethanoic acid. Name the compound and give the equation of these reactions.
Predict the major product formed when HCl is added to isobutylene. Explain the mechanism involved.
Explain the following in one or two sentences:
Allyl chloride is hydrolysed more readily than n-propyl chloride.
Allyl chloride is hydrolysed more readily than n-propyl chloride.
Note on: Cyclic structure of glucose.