This book is exclusively written for the students of various branches of diploma in engineer throughout the country in general and for the students of State of Jharkhand in particular, keeping in view of their professional requirements, after entering into their practical life. The objective of the present book is to serve the students with an elementary knowledge of chemistry. The syllabus of chemistry taught in the name of engineering chemistry in different diploma colleges are fairly diverse in nature. It is therefore quite impossible to provide a complete coverage of all the topics in a limited space for all students. However, author has dealt with modern view of the topics of the syllabi and attempted to give a major coverage at the recent syllabi taught in various diploma level institutions.* Electrochemistry * Metals and Metallurgy * Alloys * Non-Metallic Engineering Materials * Water * Corrosion * Paints and Varnishes * Lubricant and Lubrication