(SEM I) THEORY EXAMINATION 2018-19 CHEMISTRY

This is the complete B.Tech 1st Semester Engineering Chemistry (KAS102) question paper designed according to the official 100-mark university pattern. The paper includes Section A (short questions), Section B (descriptive), and Section C (long answer questions), covering all major units of the Engineering Chemistry syllabus such as:

Spectroscopy (IR, Raman, UV-Vis)

Phase rule & water system

Organometallics & Grignard reagents

Fuel chemistry & calorific values

Coal analysis & thermodynamics

Water softening (Lime–Soda, Zeolite, RO method)

Nanotechnology

Polymer chemistry

Liquid crystals, Fullerenes & Molecular orbital theory

Electrochemical cells & Nernst equation

Corrosion & its prevention

This question paper is extremely useful for AKTU students preparing for semester exams, internal assessments, competitive exams, and last-minute revision.

SECTION A – Short Conceptual Questions (10 × 2 = 20 marks)

This part tests basic concepts from all chapters:

Molecules showing rotational spectra

Polarizability in Raman spectroscopy

Why GCV > NCV

Lime requirement for Mg(HCO₃)₂

Monomers of neoprene & terylene

Role of dry ether in Grignard reagent formation

Cell potential calculation using Nernst equation

Using aluminum instead of zinc for cathodic protection

Applications of nanotechnology

Bond length order of nitrogen species

These questions help with conceptual clarity and quick revision.

SECTION B – Descriptive Questions (Attempt Any 3 × 10 = 30 marks)

This section includes explanations, derivations, and numericals:

Fullerenes

Structure, preparation, properties, and applications of C₆₀.

Nernst Equation & Thermodynamic Parameters

Calculate ΔG, ΔS, ΔH using EMF of a given electrochemical cell.

IR Spectroscopy

Finger-print vs functional group region + structural assignment to two C₃H₆O isomers using peak positions (1650 cm⁻¹ & 1710 cm⁻¹).

Water Softening

Hardness of water, permutit/zeolite process, chemical reactions & working principle.

Grignard Reagent

Preparation methods + reactions with HCHO, R₂NH, CO₂, alcohol, and esters.

These questions strengthen theory-plus-numerical understanding.

SECTION C – Long Answer Questions (5 × 10 = 50 marks)

Attempt one part from each question.

Q3 – Liquid Crystals / Molecular Orbital Theory

Nematic & Smectic liquid crystals + applications
OR

BMO vs ABMO, MO diagram of NO⁺, bond order & magnetic behavior

Q4 – Raman/IR/UV-Vis Spectroscopy

Raman selection rule + which spectroscopy to use for different bonds
OR

Beer–Lambert law + absorptivity & molar absorptivity calculation + UV distinction between compounds

Q5 – Phase Rule / Corrosion

Phase rule terms, water system diagram, triple point & metastable curve
OR

Electrochemical corrosion mechanism + cathodic protection

Q6 – Water Treatment / Fuel Chemistry

Reverse osmosis + lime-soda calculation using purity factors
OR

Proximate analysis of coal + Hydrogen % + GCV calculation

Q7 – Polymer Chemistry

Polymer blends & polymer composites + elastomers vs fibers
OR

Preparation, properties & uses of Buna-S, Buna-N, and Neoprene