(SEM II) THEORY EXAMINATION 2021-22 ENGINEERING CHEMISTRY

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