Theory Examination (Semester-II) 2015-16 ENGINEERING CHEMISTRY

This question paper evaluates knowledge of physical chemistry, organic chemistry, spectroscopy, polymers, fuels, water treatment, crystallography, and corrosion engineering.
It is divided into three sections: short answers, medium-length descriptive answers, and long analytical questions.

SECTION – A (10 × 2 = 20 Marks)

This section contains ten short-answer questions testing conceptual understanding.
Topics include:

Hydrogen bonding and boiling point trends (H₂O > HF)

Crystal symmetry, lattice planes, and NaCl unit cell

Proton splitting in ethanol (CH₃–CH₂–OH) in ¹H-NMR

Vulcanization of natural rubber

Addition vs condensation polymerisation

Triple point significance

“IR spectra as molecular fingerprints”

Copolymers: Buna-S vs Buna-N

Polymer preparation (Bakelite, Nylon-6, Nylon-66, Dacron)

Calgon vs phosphate conditioning, calorific value, biomass

This section checks core definitions and principles of chemistry.

SECTION – B (5 × 10 = 50 Marks)

This section contains five medium-length descriptive questions on:

Calculation of lime & soda required for water softening

Optical isomerism (racemic mixture, inversion in SN2, lactic acid chirality)

IR spectroscopy: definition & molecular vibrations

NaCl crystal density → calculation of unit cell edge

Air required for complete combustion of coal

Corrosion mechanism: oxide-film growth law

This section examines numerical ability, structural chemistry, spectroscopy concepts, and industrial chemistry processes.

SECTION – C (2 × 15 = 30 Marks)

This section contains two long-answer questions assessing deeper understanding.

Topics include:

Fullerenes

Structure, properties, and applications

Bond order calculations for N₂⁻, CO, NO, O₂

Fuel Technology

Determination of calorific value using bomb calorimeter

Expression of hardness as CaCO₃ equivalent & its units

Corrosion & Water Treatment

Anodic and cathodic corrosion inhibitors

Bomb-calorimeter calculation (gross & net calorific value)

Zeolite process for water softening

This section evaluates advanced concepts, derivations, industrial methods, and numerical calculations.