About this previous year paper
This document contains the complete Engineering Chemistry (RAS202) Theory Examination Paper for B.Tech Semester II, conducted in the academic year 2017–18. The exam carries 70 marks and has a duration of 3 hours. It evaluates a student’s understanding of chemical bonding, polymers, electrochemistry, corrosion, water treatment, fuels, phase rule, nanomaterials, spectroscopy, and industrial chemistry concepts.
The paper is divided into three major sections—A, B, and C—covering definitions, theory, numerical problems, and applied chemistry concepts.
SECTION A – Short Conceptual Questions (14 Marks)
This section consists of seven short-answer questions, covering:
Bond order calculation
Electrical conductivity of graphite
Functionality of polymers
Electrochemical reactions in a lead-acid storage cell
Corrosion behavior in metals
Calgon conditioning (water softening)
Calculation of GCV and NCV of coal
These questions test essential definitions and fundamental chemical principles.
SECTION B – Descriptive & Numerical Questions (21 Marks)
Students must attempt any three of the following, covering applied chemistry topics:
Molecular Orbital Theory and differentiation among conductors, semiconductors, and insulators
Preparation, properties, and applications of BUNA-N, Terylene, and intrinsically conducting polymers
Construction & working of Galvanic cell and mechanisms of lubrication
Lime–soda calculation for water softening and application of the phase rule to water
Air requirement for complete combustion of fuel and composition & working of a biogas plant
This section assesses applied chemistry problem-solving skills.
ENGINEERING-CHEMISTRY-RAS202-1
SECTION C – Advanced Theory, Defects, Materials & Instrumentation (35 Marks)
Each question carries 7 marks; students attempt one from each pair:
Part 1 – Solid State Chemistry & Nanoscience
Schottky and Frenkel defects
Properties and applications of fullerenes
Paramagnetism of O₂
Applications of nanomaterials in electronics and medicine
Part 2 – Organic & Composite Materials
Grignard reagents, preparation, and applications
Definition and classification of composite materials
Part 3 – Corrosion & Cement Manufacturing
Electrochemical theory of corrosion and sacrificial protection with zinc
Manufacturing process & chemical composition of Portland cement, including setting and hardening
Part 4 – Water Softening & Phase Rule
Zeolite process, regeneration, and hardness calculation
Explanation of phase, components, and degree of freedom
Part 5 – Spectroscopy & Fuel Analysis
Chemical shift, shielding/deshielding, interpretation of proton NMR data
Explanation of GCV, NCV, and working of the bomb calorimeter
This section evaluates deep conceptual understanding of materials chemistry, electrochemistry, spectroscopy, and industrial processes.