Master the fundamentals of laws and chemistry. Take the first step towards passing with this one book. This book is a basic preparation problem collection (NO.1) that fully supports the Poisonous and Deleterious Substances Handler Examination, with a total of 100 questions + detailed answers and explanations. Focusing on the Poisonous and Deleterious Substances Control Law, it clearly organizes important items frequently appearing on the exam, such as the basics of chemistry, handling methods, first aid, and safety management. ⸻ Contents of this book • Chapter 1: Laws Regarding Poisonous and Deleterious Substances (Basic Edition) Systematic explanation of the legal field with the highest frequency of questions on the exam, including the definition of poisonous and deleterious substances, the sales registration system, restrictions on transfer and receipt, and labeling obligations. • Chapter 2: Basic Chemistry (Introductory Edition) Careful organization of basic chemistry that examinees tend to find difficult, such as pH, acids and bases, oxidation-reduction, and mole calculations. • Chapter 3: Properties, Storage, and Handling Methods of Poisonous and Deleterious Substances Explanation of the properties, dangers, and storage methods of major chemical substances such as cyanide, concentrated sulfuric acid, formaldehyde, and chlorine. • Chapter 4: Practical Problems (First Aid and Safety Management) Includes many problems useful for on-site response, such as procedures for dealing with accidental ingestion, leakage, and fire, worker protection, and identification of signs and labels. ⸻ Features • 100 multiple-choice questions + detailed explanations that allow you to learn laws, chemistry, and practical skills in a balanced manner. • Each question includes "legal basis + supplementary knowledge + on-site memo"