BCHCT-131 IGNOU Guess Paper 2026-27

Course Scope & Syllabus Overview

BCHCT-131, titled “Atomic Structure, Bonding, General Organic Chemistry and Aliphatic Hydrocarbons,” is a core component of the Bachelor of Science (BSCG) curriculum under the School of Sciences (SOS). The course follows the IGNOU CBCS structure, emphasizing conceptual clarity and application across atomic theory, chemical bonding, organic fundamentals, and hydrocarbon chemistry. Students gain a solid foundation in atomic models, valence concepts, hybridization, and reaction mechanisms, enabling them to tackle both theoretical examinations and practical problem‑solving scenarios.

The Guess Paper is meticulously curated to mirror the actual exam pattern: it includes solved papers from the past 5–10 years (June & December cycles), a detailed chapter‑wise question weightage, and a compilation of highly recurrent questions. A dedicated section on 3‑hour time management equips candidates to allocate their effort efficiently, ensuring maximum marks within the stipulated duration.

• Unit 1: Atomic Structure Covers the evolution of atomic models, quantum numbers, electron configuration, and periodic trends.
• Unit 2: Chemical Bonding And Molecular Structure Explores ionic, covalent, metallic, and coordinate bonds, hybridization, and VSEPR theory.
• Unit 3: Fundamentals of Organic Chemistry Introduces nomenclature, functional groups, isomerism, and basic reaction mechanisms.
• Unit 4: Hydrocarbons Discusses alkanes, alkenes, alkynes, aromatic compounds, and their characteristic reactions.

Frequently Asked Questions

Q: What is the marking scheme for the IGNOU Term-End Examination in BCHCT-131?
A: The exam comprises objective and subjective sections with a total of 100 marks; objective questions carry 1 mark each, while subjective answers are worth 2–3 marks depending on depth.

Q: How many questions are typically asked from each unit in the exam?
A: Approximately 25–30% of questions are drawn from each unit, with a higher emphasis on Units 1 and 2 due to their conceptual depth.