(SEM I) THEORY EXAMINATION 2020-21 ENGINEERING CHEMISTRY

This document contains the official AKTU B.Tech 1st Semester (2020–21) Theory Examination question paper for Engineering Chemistry (KAS102T). It is a full 100-mark, 3-hour exam paper and follows the complete AKTU pattern with Section A, Section B, and Section C. This question paper is essential for students preparing for end-semester exams, internal tests, or quick revision of key chemistry concepts relevant to engineering applications.

Engineering Chemistry plays a vital role in helping first-year students build a strong foundation in chemical bonding, spectroscopy, water treatment, fuel analysis, polymer science, material chemistry, thermodynamics, phase rule, and Grignard reactions. This paper covers both theoretical and numerical concepts commonly asked in the AKTU examination.

Detailed Breakdown of the Question Paper

SECTION A – 10 Short Questions (20 Marks)

This section contains 10 very short questions, each worth 2 marks. Topics include:

Impurity defects in solids

Chemical resistance of Teflon

Selection rule

IR spectra: Intermolecular vs intramolecular H-bonding

Phase, components, and degree of freedom (Gibbs Phase Rule)

Calgon process for water treatment

Preparation of Grignard reagent

Paramagnetism of O₂ and diamagnetism of N₂

Estimation of sulfur by ultimate analysis

Rust yield from iron

These questions help with quick revision before exams.

SECTION B – 3 Long Questions (30 Marks)

Students must attempt any 3 out of 5 questions. These include:

Metallic bonding using Molecular Orbital Theory

Criteria for Raman/IR/Rotational/UV spectra

Vibrational degrees of freedom of CO₂, H₂O, C₂H₂

Coal analysis: air required, GCV & NCV (Dulong’s formula)

Nernst equation + EMF calculation of electrochemical cell

Addition vs condensation polymerization + monomers & applications of PMMA, PE, Bakelite, PVC, Nylon-6,6, Buna-S

This section strengthens conceptual understanding and numerical problem-solving skills.

SECTION C – 5 Long Answer Questions (50 Marks)

Students must attempt one part from each question. Each question carries 10 marks and includes detailed concepts:

Question 3 — Solid State & Bond Order

Non-stoichiometric defects

Bond order, magnetic behavior, stability of NO, NO⁻, NO⁺

Question 4 — Thermodynamics & Phase Rule

Calculation of ΔH, ΔG, ΔS
OR

Water phase diagram, triple point & metastable state

Question 5 — Molecular Spectroscopy

Chromophores, auxochromes, UV transitions
OR

Microwave spectra of diatomic molecules + applications

Question 6 — Fuel Chemistry & Water Softening

Bomb calorimeter + proximate analysis of coal
OR

Ion exchange water softening + hardness calculation

Question 7 — Grignard Reagent & Composites

Preparation of acids, ketones, alcohols, alkanes, organometallic compounds from Grignard reagent
OR

Composite materials + classifications

This section tests deep understanding, derivations, numerical reasoning, and chemical applications.