THEORY EXAMINATION (SEM–II) 2016-17 ENGINEERING CHEMISTRY

This question paper is designed for Engineering Chemistry and covers important topics such as water treatment, spectroscopy, bonding, polymers, stereochemistry, corrosion, fuels, biogas, IR vibrations, and molecular structure.
It is divided into three sections that test conceptual clarity, numerical ability, and applied understanding.

SECTION – A (10 × 2 = 20 Marks)

This section contains ten short answer questions focusing on basic definitions and direct concepts.
Topics include:

Temporary & permanent hardness of water

β-carotene and visible absorption

NCV vs GCV

Bonding vs antibonding orbitals

Polymer & polymerization

Unit cell types

Elastomers

Bond order of O₂

Number of NMR signals in ethanol

Priming & foaming in boilers

This section checks fundamental chemistry knowledge.

SECTION – B (5 × 10 = 50 Marks)

Students must attempt any five medium-length descriptive questions.
Topics include:

Metallic bonding and MO theory; bond order of N₂ and O₂

Addition vs condensation polymerization; preparation of PMMA, Orlon, Polystyrene

Zeolite water softening process and hardness calculation

Optical isomerism in tartaric acid; enantiomers vs diastereomers

Chromophores and auxochromes; UV absorbance numerical

Electrochemical corrosion: mechanism and rust calculation

Structure of graphite and its conductivity; SN1 vs SN2 mechanism

This section tests application, diagrams, numericals, and chemical mechanisms.

SECTION – C (2 × 15 = 30 Marks)

Students must attempt any two long descriptive questions.
Topics include:

Biogas

Production process, biogas plant diagram

Potable water & its chemical requirements

Biodegradable polymers

Uses and preparation

Synthesis of Bakelite, Perspex, and cis-1,4 polyisoprene

IR Spectroscopy & Water Hardness

Vibrational modes (stretching & bending) of XY₂ bent molecule

Calculation of temporary and total hardness

This section evaluates deep understanding, derivations, numerical solutions, and process-based chemistry.