Introduction:
In the chemistry section of the JEE Advanced exam, questions related to coordination compounds and complex ions are quite common. These questions test your understanding of the concepts and principles governing the formation, properties, and reactions of coordination compounds. To solve such questions effectively, it is important to have a systematic approach and apply specific strategies. Here are some key strategies to keep in mind:

Understand the Basics:
Before attempting any question on coordination compounds, it is crucial to have a clear understanding of the basic concepts. Make sure you are familiar with terms such as coordination number, ligands, central metal atom, coordination sphere, coordination isomerism, etc. Revise the Werner's theory and the nomenclature rules for coordination compounds.

Identify the Central Metal Atom:
In most coordination compounds, there is a central metal atom or ion surrounded by ligands. Identify the central metal atom and determine its oxidation state. This information will help you in determining the coordination number, electronic configuration, and possible ligands that can bind to the metal atom.

Consider the Ligands:
Ligands are atoms, ions, or molecules that can donate electron pairs to the central metal atom. Understand the different types of ligands such as monodentate, bidentate, polydentate, and ambidentate ligands. Be aware of common ligands like ammonia, water, cyanide, chloride, etc. Consider the charge and geometry of the ligands when determining the overall charge and shape of the complex.

Apply the Werner's Coordination Theory:
The Werner's coordination theory helps in understanding the bonding and structure of coordination compounds. It states that the central metal atom forms coordinate bonds with ligands through the donation of electron pairs. Understand the different types of bonds including coordinate bonds, covalent bonds, and ionic bonds present in coordination compounds.

Consider Isomerism:
Isomerism is a common concept in coordination compounds, and questions related to isomerism often appear in the JEE Advanced exam. Understand the different types of isomerism such as geometric isomerism, optical isomerism, linkage isomerism, and ionization isomerism. Pay attention to the arrangement of ligands and the presence of chiral centers when considering isomerism.

Balance Chemical Equations:
Coordination compounds often take part in various chemical reactions. It is important to balance the chemical equations involving coordination compounds to determine the stoichiometry and understand the changes in oxidation states and coordination spheres.

Practice Previous Year Question Papers:
To gain confidence and improve your problem-solving skills, practice solving previous year question papers and sample papers. This will help you become familiar with the patterns and types of questions asked in the JEE Advanced exam.

Conclusion:
Solving questions related to coordination compounds and complex ions in the chemistry section of the JEE Advanced exam requires a solid understanding of the basic concepts, application of the Werner's coordination theory, and consideration of isomerism and chemical reactions. By following a systematic approach, practicing regularly, and revising the important topics, you can effectively solve these types of questions and improve your overall performance in the exam.