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Iron (Fe) is used as a catalyst in the Haber process for ammonia synthesis ( N₂ + 3H₂ -> 2NH₃ ). This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Enzymes, which are proteins, act as biological catalysts, speeding up reactions without being consumed.
Ref: NCERT Class 12 Chemistry > Chapter 14: Biomolecules > Topic: Enzymes - Nomenclature, Properties and Mechanism
Variable oxidation states allow transition metals to form unstable intermediates.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Oxidation States and Colour and Magnetic Properties of d-Block
23S/28S rRNA is the scientifically accurate answer to this question. Within the study of Acid, Base, pH, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of 23S/28S rRNA directly address what is being asked. Among the other options, ribosomal proteins, tRNA, and mRNA do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2
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