B TECH (REGULAR+CARRYOVER) (SEM I) THEORY EXAMINATION 2017-18 ENGG. CHEMISTRY

This question paper is a complete and structured Engineering Chemistry exam designed as per the 70-mark university pattern. It covers all core concepts of first-year engineering chemistry including:

Molecular orbital theory

Polymers and polymerization

Water treatment (Lime–soda & Zeolite processes)

Thermochemistry and calorific value

Electrochemistry (Galvanic cell, EMF calculation)

Fuel chemistry (Coal analysis)

Nanotechnology

NMR spectroscopy

Cement, lubricants, organometallic compounds

Phase rule and liquid crystals

The paper is divided into three sections (A, B, C) and includes short conceptual questions, numerical problems, derivations, chemical reasoning, and structural predictions. This makes the paper highly valuable for exam preparation, revisions, competitive exams, and viva practice.

SECTION A – Short Answer Questions (7 × 2 = 14 Marks)

This section tests quick conceptual understanding:

Condition when GCV = NCV

Reducing power order using standard reduction potentials

Applications of nanotechnology

Bond energy order for oxygen species (O₂, O₂²⁺, O₂²⁻)

Hardness calculation from MgSO₄ equivalent

Whether acrylonitrile undergoes anionic or cationic polymerization (with reason)

Number of NMR signals in mesitylene

These short questions aim at evaluating clarity of fundamental chemical concepts.

SECTION B – Descriptive Questions (Attempt Any 3 × 7 = 21 Marks)

Molecular Orbital Diagram

MO diagram of N₂

Bond order

Magnetic properties

Polymers

Thermoplastic vs thermosetting

Addition vs condensation polymerization

Galvanic Cell

Construction & working

EMF calculation using Nernst equation

Cell reactions for Zn/Ag cell

Lime–Soda Process

Principle & reactions

Lime and soda calculations for large-scale water softening

Use of sodium aluminate (coagulant)

Bomb Calorimeter

Working principle

High & low calorific value calculation

These questions strengthen the student’s understanding of key topics and numerical problem-solving.

SECTION C – Long Questions (7 Marks Each)

Q3 – Allotropes & Liquid Crystals

Choose one:

Option (a)

Structure, bonding, properties, and applications of graphite

Option (b)

Liquid crystals

Difference between nematic & smectic phases

Applications

Q4 – Polymers & Organometallics

Choose one:

Option (a)

Organometallic compounds

Classification, preparation, applications

Option (b)

Preparation, properties, uses of:

Nylon-6

Bakelite

Q5 – Cement & Lubricants

Choose one:

Option (a)

Portland cement

Setting & hardening reactions

Option (b)

Lubricants

Fluid film theory & boundary lubrication theory

Q6 – Water Softening & Phase Rule

Choose one:

Option (a)

Phase rule

Application to water system (P-V-T diagram, triple point, degrees of freedom)

Option (b)

Zeolite softening process with regeneration

Hardness calculation using brine regeneration data

Q7 – Coal Analysis & NMR Spectroscopy

Choose one:

Option (a)

Rank of coal

Proximate analysis

Ultimate analysis

Option (b)

Shielding vs deshielding in NMR

Interpretation of given NMR signals and identification of unknown aromatic compound