SOLUTIONS
to
THEORETICAL QUESTIONS
from
ENGINEERING CHEMISTRY
QUESTIONNAIRES
for
SEMESTER I
ACADEMIC YEAR 2025-2026
Meet Mandar Jagtap () | 1
, DISCLAIMER
This document has been prepared solely for reference and study purposes by a
student and is not an official answer key or material issued by the Institute,
department, or faculty.
While every effort has been made to ensure accuracy, errors, omissions, or
differences in interpretation may exist. The answers provided here may not
exactly match the expected answers in the actual examination, and evaluation
criteria may vary.
Students are advised to use this document at their own discretion and risk.
The compiler of this document shall not be held responsible for:
• Any answers being marked incorrect
• Loss of marks
• Any academic consequences arising from the use of this material in
examinations or assessments
Sources Used
The content of this document has been prepared using only the following sources:
1. Notes provided via Google Classroom by Prof. Harsha Mishra
2. Class notes prepared by students during Prof. Abhishek M.’s lectures
It is explicitly stated that neither of these individuals bear any responsibility
whatsoever for any errors, inaccuracies, or consequences arising from the use of
this document.
This material is unofficial and intended strictly as a study aid, not a substitute for
prescribed textbooks, official notes, or faculty guidance.
Use this document at your own risk.
Meet Mandar Jagtap () | 2
, TABLE OF CONTENTS
Module Page
Module Name
No. No.
1 CORROSION 4
2 WATER 15
3 FUELS & COMBUSTION 19
NON-CONVENTIONAL
4 23
ENERGY SOURCES
GREEN CHEMISTRY &
5 26
SYNTHESIS OF DRUGS
6 PRINCIPLES OF SPECTROSCOPY 31
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, Module 1 : CORROSION
Q What is cathodic protection?
Cathodic protection is a method of corrosion control in which the metal to be protected
is forced to behave like a cathode, thereby preventing corrosion. Since corrosion occurs
at the anode, making the metal act as a cathode stops corrosion.
Q Explain sacrificial anodic protection with the help of a diagram.
In sacrificial anodic protection, the metal to be protected is connected by a wire to a
more anodic (more active) metal. The corrosion is concentrated on this more active
metal, which gets corroded instead of the parent structure. This active metal is called the
sacrificial anode. Metals such as magnesium, zinc, aluminium, and their alloys are
commonly used. This method is used for buried pipelines, underground cables, and
marine structures.
Q Explain impressed current cathodic method with the help of a diagram.
In impressed current cathodic protection, an external direct current is applied in the
opposite direction to the corrosion current to nullify it and convert the corroding metal
from anode to cathode. The current is supplied from a DC source (such as a rectifier on
an AC line) using an insoluble anode like graphite or stainless steel. This method is used
for protecting water tanks, box coolers, and buried oil or water pipelines.
Meet Mandar Jagtap () | 4
to
THEORETICAL QUESTIONS
from
ENGINEERING CHEMISTRY
QUESTIONNAIRES
for
SEMESTER I
ACADEMIC YEAR 2025-2026
Meet Mandar Jagtap () | 1
, DISCLAIMER
This document has been prepared solely for reference and study purposes by a
student and is not an official answer key or material issued by the Institute,
department, or faculty.
While every effort has been made to ensure accuracy, errors, omissions, or
differences in interpretation may exist. The answers provided here may not
exactly match the expected answers in the actual examination, and evaluation
criteria may vary.
Students are advised to use this document at their own discretion and risk.
The compiler of this document shall not be held responsible for:
• Any answers being marked incorrect
• Loss of marks
• Any academic consequences arising from the use of this material in
examinations or assessments
Sources Used
The content of this document has been prepared using only the following sources:
1. Notes provided via Google Classroom by Prof. Harsha Mishra
2. Class notes prepared by students during Prof. Abhishek M.’s lectures
It is explicitly stated that neither of these individuals bear any responsibility
whatsoever for any errors, inaccuracies, or consequences arising from the use of
this document.
This material is unofficial and intended strictly as a study aid, not a substitute for
prescribed textbooks, official notes, or faculty guidance.
Use this document at your own risk.
Meet Mandar Jagtap () | 2
, TABLE OF CONTENTS
Module Page
Module Name
No. No.
1 CORROSION 4
2 WATER 15
3 FUELS & COMBUSTION 19
NON-CONVENTIONAL
4 23
ENERGY SOURCES
GREEN CHEMISTRY &
5 26
SYNTHESIS OF DRUGS
6 PRINCIPLES OF SPECTROSCOPY 31
Meet Mandar Jagtap () | 3
, Module 1 : CORROSION
Q What is cathodic protection?
Cathodic protection is a method of corrosion control in which the metal to be protected
is forced to behave like a cathode, thereby preventing corrosion. Since corrosion occurs
at the anode, making the metal act as a cathode stops corrosion.
Q Explain sacrificial anodic protection with the help of a diagram.
In sacrificial anodic protection, the metal to be protected is connected by a wire to a
more anodic (more active) metal. The corrosion is concentrated on this more active
metal, which gets corroded instead of the parent structure. This active metal is called the
sacrificial anode. Metals such as magnesium, zinc, aluminium, and their alloys are
commonly used. This method is used for buried pipelines, underground cables, and
marine structures.
Q Explain impressed current cathodic method with the help of a diagram.
In impressed current cathodic protection, an external direct current is applied in the
opposite direction to the corrosion current to nullify it and convert the corroding metal
from anode to cathode. The current is supplied from a DC source (such as a rectifier on
an AC line) using an insoluble anode like graphite or stainless steel. This method is used
for protecting water tanks, box coolers, and buried oil or water pipelines.
Meet Mandar Jagtap () | 4
