Code: cheMechanical Engineering2nd Semester10 Examination Papers

Engineering Chemistry

Official Bihar Engineering University examination question papers, marks distribution, and questions transcript. Available exam sessions: 2026, 2025, 2024, 2022, 2021, 2020.

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Official Exam Paper TranscriptB.Tech 2nd Semester Examination, 2026
Bihar Engineering University, Patna
B.Tech 2nd Semester Examination - 2026

Engineering Chemistry

Time: 03 HoursCode: 100215Full Marks: 70

Instructions:

  1. The marks are indicated in the right-hand margin.
  2. There are NINE questions in this paper.
  3. Attempt FIVE questions in all.
  4. Question No. 1 is compulsory.
Q.1 Choose the correct option / answer the following (Any seven question only):[2×7=14]

  1. The shape of the ammonia (NH₃) molecule according to VSEPR theory is?

    1. Trigonal planar
    2. Linear
    3. Trigonal pyramidal
    4. Tetrahedral

  2. Which of the following metal carbonyls obeys the 18-electron rule?

    1. Fe(CO)₅
    2. Ni(CO)₄
    3. Cr(CO)₄
    4. Mn(CO)₂

  3. UV-Visible spectroscopy mainly involves transitions of

    1. Nuclear spins
    2. Core electrons only
    3. Protons only
    4. Valence electrons

  4. The resonance frequency, in NMR spectroscopy depends mainly on

    1. Molecular weight
    2. External magnetic field
    3. Density
    4. Melting point

  5. The Nernst equation is used to determine

    1. Rate of reaction
    2. Heat of reaction
    3. Molecular weight
    4. Cell potential under non-standard conditions

  6. Which electrolyte is used in a lead-acid battery?

    1. NaOH
    2. Dilute H₂SO₄
    3. HCl
    4. KOH

  7. Temporary hardness of water is mainly due to

    1. Calcium chloride
    2. Magnesium sulfate
    3. Sodium chloride
    4. Calcium bicarbonate

  8. Which process removes hardness by exchanging Ca²⁺ and Mg²⁺ ions with Na⁺ ions?

    1. Lime-soda process
    2. Zeolite process
    3. Distillation
    4. Reverse osmosis

  9. Which polymer is an example of a thermoplastic?

    1. Bakelite
    2. Melamine
    3. Polyethylene
    4. Epoxy resin

  10. Silicones are classified as

    1. Natural polymers
    2. Condensation monomers
    3. Biopolymers
    4. Inorganic polymers
Q.2

  1. Discuss the Photoelectric Effect and Heisenberg's Uncertainty Principle with suitable examples.

    [7]

  2. Describe the formation of Molecular Orbitals using the Linear Combination of Atomic Orbitals. Draw and explain the molecular orbital diagram of O₂.

    [7]
Q.3

  1. Explain the principles of rotational and vibrational spectroscopy and applications of these techniques in structural elucidation of organic molecule.

    [7]

  2. Describe the principle, instrumentation, and applications of UV-Visible spectroscopy in chemistry.

    [7]
Q.4

  1. Derive the Nernst equation and explain its significance in determining the EMF of electrochemical cells under non-standard conditions.

    [7]

  2. Explain the mechanism of corrosion. Discuss different types of corrosion with suitable examples.

    [7]
Q.5

  1. What is hardness of water? Explain the types of hardness and describe the estimation of hardness by the EDTA method.

    [7]

  2. Discuss in details the Lime-Soda process for the removal of hardness of water.

    [7]
Q.6

  1. Differentiate between thermoplastics and thermosetting plastics. Discuss the preparation, properties and applications of commercially important thermoplastics such as Polyethylene, Polyvinyl Chloride and Polystyrene.

    [7]

  2. Describe the preparation, properties and applications of Phenol-Formaldehyde resin (Bakelite).

    [7]
Q.7

  1. Explain the Diels–Alder cyclization reaction and epoxide ring-opening reaction and their applications in organic synthesis.

    [7]

  2. Discuss the synthesis of aspirin from salicylic acid. Explain the reaction mechanism and significance of aspirin as an important pharmaceutical drug.

    [7]
Q.8 Write Short note on:

  1. Chemical Shift in NMR spectroscopy.

    [7]

  2. Working and advantages of fuel cells.

    [7]
Q.9 Write short note on any two of the following:[7×2=14]

  1. Bonding metal carbonyls

  2. Boiler problems such as sludge formation, scale formation, priming and foaming

  3. Oxidation-reduction reactions in organic chemistry

  4. Mechanism of free radical polymerization reaction

Related Official Syllabus

Programming for Problem Solving

100203

Official BEU curriculum units & topics for this examination subject.

Unit 1.0: Introduction to Programming

Introduction to components of a computer system (disks, memory, processor, where a program is stored and executed, operating system, compilers etc.) • Idea of Algorithm: steps to solve logical and numerical problems • Representation of Algorithm: Flowchart/ Pseudo code with examples • From algorithms to programs; source code • Variables (with data types) variables and memory locations • Syntax and Logical Errors in compilation • Object and executable code

Unit 2.0: Operators, Conditional Branching and Loops

Arithmetic expressions/arithmetic operators • Relational operators • Logical operators • Bitwise operators and precedence • Writing and evaluation of conditionals and consequent branching • Iteration and loops

Unit 3.0: Arrays and String

Array declaration & initialization • Bound checking arrays (1-d, 2-d) • Character arrays and strings

Unit 4.0: Function, Recursion and Pointers

Functions (including using built in libraries) • Parameter passing in functions • Call by value • Passing arrays to functions: Recursion, as a different way of solving problems • Example programs, such as Finding Factorial, Fibonacci series, Ackerman function etc. • Idea of pointers • Defining pointers • Use of Pointers in self- referential structures • Idea of call by reference

Unit 5.0: User defined Data Types and File handling

Structure: defining, declaring, initializing; accessing structure members, processing of structure, array of structures, structures within structure, structure and function, type definition • Union: definition, declaration, accessing union members, initializing union • Introduction, file declaration, opening and closing a file, working with text and binary files, I/O operations on file, error handling, random access to files

View Complete 2nd Semester Syllabus

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