About this previous year paper
This document contains the complete and authentic B.Tech (Semester II) Theory Examination Question Paper for Engineering Chemistry (Subject Code: KAS202T) for the 2021–22 academic session. The paper is designed to comprehensively evaluate a student’s conceptual, analytical, and application-based understanding of fundamental and applied chemistry related to engineering. Topics covered include molecular orbital theory, spectroscopy techniques, corrosion, water treatment, electrochemistry, organometallic chemistry, fuel analysis, phase rule, polymer chemistry, and calorimetry.
The exam consists of three structured sections, each focusing on different levels of knowledge—from short theoretical answers to detailed numerical and diagram-based explanations.
SECTION A – Short Conceptual Questions (10 × 2 = 20 marks)
Section A contains ten concise questions that test basic principles and quick conceptual clarity across major chemistry units. Topics include:
Why helium is monatomic while hydrogen is diatomic
Increasing order of bond stability of nitrogen species (N₂²⁻, N₂⁻, N₂)
Concentration calculation using Beer–Lambert Law
Definition of Raman active molecules
Difference between 3-component and 4-component systems in phase rule
EMF calculation of a galvanic cell
Percentage of sulphur in coal using bomb calorimeter residue
Hardness conversion from ppm to French and Clarke degrees
Monomers of Buna-S and Nylon-66
Structures of Ferrocene and Dibenzene Chromium
These questions check foundational understanding and essential formula familiarity.
SECTION B – Analytical, Numerical & Descriptive Questions (10 × 3 = 30 marks)
Students must attempt any three of the following five questions. This section includes derivations, chemical mechanisms, numerical calculations, and explanation of practical chemistry applications.
Topics include:
Applications and properties (electrical & lubrication) of graphite
Raman spectroscopy, chromophores, and auxochromes in UV spectroscopy
Electrochemical theory of corrosion, including hydrogen evolution and oxygen absorption mechanisms, and cathodic protection
Process of lime–soda water softening and calculation of required lime and soda for given water hardness composition
Introduction to organometallic compounds, preparation of Grignard reagents, and five key applications
This section links theoretical chemistry to real-world industrial and engineering processes.
SECTION C – Long Descriptive & Problem-Solving Questions (10 × 4 = 40 marks)
Each subsection allows students to attempt one detailed question, covering higher-level understanding of spectroscopy, electrochemistry, calorimetry, and polymer chemistry.
Major topics include:
Q3 – Molecular Orbital Theory & Carbon Allotropes
MO diagrams explaining paramagnetic O₂ and diamagnetic N₂
Structure, preparation, properties, and applications of fullerenes
Q4 – Spectroscopy
Rotational spectroscopy, microwave instruments, and conditions for microwave activity
Infrared spectroscopy, molecular vibrations, and applications
Q5 – Electrochemistry & Phase Rule
Secondary storage batteries, reactions of lead–acid battery, and applications
Phase rule, degree of freedom of triple point, and phase diagram of water
Q6 – Calorimetry & Fuel Chemistry
Detailed bomb calorimeter method
Calculations involving gross calorific value (GCV) and net calorific value (NCV) of coal samples
Q7 – Polymer Chemistry
Synthesis and applications of polymers such as Buna-S, Neoprene, Nylon-66, and Dacron
Conducting polymers, their classification, and applications
These questions test analytical reasoning, numerical competency, chemical interpretation skills, and the ability to apply chemical concepts to engineering contexts.
Sample Questions from This Paper (1–2 included)
“Explain why helium is monatomic and hydrogen is diatomic?”
— A conceptual question testing understanding of atomic structure and bonding.
“Explain the mechanism of electrochemical theory of corrosion with hydrogen evolution and oxygen absorption reactions. Describe cathodic protection in detail.”
— A long descriptive question reflecting applied industrial chemistry.
These sample questions demonstrate the depth and variety of the complete paper.
Overall Coverage of This Question Paper
This Engineering Chemistry paper thoroughly covers the important units from the curriculum:
Molecular orbital theory & chemical bonding
Spectroscopy (UV, Raman, IR, rotational/microwave)
Electrochemistry & EMF calculations
Corrosion mechanisms & protection techniques
Water softening & hardness calculations
Phase rule & phase diagrams
Fuel analysis, calorific value, bomb calorimetry
Organometallic chemistry & Grignard reagents
Polymers, polymer synthesis & applications
Carbon allotropes (graphite, fullerenes)
Coordination compounds (Ferrocene, organometallics)
The paper balances theoretical concepts with numerical problem-solving and practical application-based question