For the Halogen ' \(X\) ', halous acid and perhalic acid respectively are: (a) \(\mathrm{HXO}_{2}, \mathrm{HXO}_{4}\) (b) \(\mathrm{HSO}_{4}, \mathrm{HXO}_{2}\) (c) \(\mathrm{HXO}_{3}, \mathrm{HXO}_{4}\) (d) \(\mathrm{HXO}_{4}, \mathrm{HXO}_{3}\)

The National Eligibility cum Entrance Test (NEET) for aspiring medical students covers a broad range of topics, including Chemistry, which is a core subject in the examination. Chemistry in NEET primarily tests knowledge and application of concepts across various branches such as Physical, Organic, and Inorganic Chemistry. Within Inorganic Chemistry, understanding of halogen compounds is essential.
For students preparing for NEET, mastering the properties, reactions, and nomenclature of halogen compounds, including the oxyacids of halogens, can prove to be crucial. Questions often probe a student's ability to decipher chemical formulas and their relevant nomenclature which requires clear and foundational learning of the subject.

Halogen compounds involve the family of elements fluorine, chlorine, bromine, and iodine, known collectively as the halogens. These elements are located in Group 17 of the periodic table and are known for their high reactivity. A characteristic feature of halogens is their ability to form compounds with almost every element. In halogen compounds, the halogen can either exist as a negative ion called a halide (such as Cl⁻), or it can be covalently bonded to carbon or another nonmetal.

In oxyacids, which are specific types of halogen compounds, a halogen atom is bonded to oxygen. These acids play a significant role in industrial chemistry and environmental science. They are also pivotal in enhancing a student's understanding of halogen reactivity and acid-base chemistry.

Oxyacids are acids that contain hydrogen, oxygen, and another element, which is often a nonmetal such as a halogen. When it comes to halogens, the oxyacids can be categorized into several types based on the number of oxygen atoms present. Examples include halous acids (like HXO₂), halic acids (such as HXO₃), and perhalic acids (for instance, HXO₄).

For each halogen, the 'X' in the oxyacid formulas HXO_n represents the halogen atom. The nomenclature is indicative of the oxygen content: 'halous' represents an oxyacid with one less oxygen than the 'halic' acid, and 'perhalic' indicates an oxyacid containing more oxygen. Understanding how to interpret these formulas is an invaluable skill that students must attain for competency in chemical nomenclature, as it aids in predicting the properties and behavior of such compounds.