NCERT Exemplar Solution for Class 8 Science Chapter-14 – Chemical Effects of Electric Current
Electricity is not only used for lighting homes and operating machines, but it also produces several chemical changes when passed through certain liquids. Chapter 14 of Class 8 Science introduces students to the fascinating relationship between electricity and chemical reactions. The chapter explains how some liquids conduct electricity, the process of electroplating, and the chemical effects caused by electric current. Students also learn about conductors and insulators in liquids through practical activities and experiments. The NCERT Exemplar Solution for Class 8 helps learners understand these scientific concepts in a simple and application-based manner. It includes conceptual questions, logical explanations, and practical examples that make learning more engaging. The NCERT Exemplar Solution is especially useful for students preparing for school exams because it improves analytical thinking and scientific understanding. By practicing with NCERT solutions for class 8, students gain confidence in answering both theoretical and activity-based questions effectively.
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Conducting Liquids and Electric Current
One of the major topics covered in this chapter is the ability of certain liquids to conduct electricity. Students already know that metals are good conductors of electricity, but this chapter explains that some liquids can also allow electric current to pass through them. Liquids such as lemon juice, tap water, salt solution, and acidic solutions conduct electricity because they contain dissolved salts or minerals. Distilled water, however, is a poor conductor because it lacks impurities and ions required for conduction.
The chapter introduces the use of simple tester devices to check whether a liquid conducts electricity or not. Students learn that when electric current passes through a conducting liquid, chemical reactions may occur inside the solution. These reactions are called the chemical effects of electric current. Through exemplar questions, students understand why ordinary water conducts electricity better than pure distilled water. Practical examples make these concepts easier to remember and help learners connect classroom science with everyday life. The chapter also explains that the magnetic effect of electric current can be used to detect electricity in weak conducting liquids. This makes the learning process more interesting and activity-oriented for students.
Chemical Effects of Electric Current
When electric current flows through a conducting liquid, it can produce visible chemical changes. This is one of the most important concepts explained in Chapter 14. The chapter discusses how electric current can create bubbles of gas, change the color of solutions, or deposit materials on electrodes.
Formation of Chemical Changes
Chemical reactions occur because electric current breaks down substances present in the liquid. During experiments, students may observe bubbles forming at electrodes due to the release of gases. In some cases, metals get deposited on objects placed in the solution.These observations help students understand that electricity can cause physical as well as chemical transformations. The exemplar solutions explain these processes step by step, making complex concepts easier to understand. The chapter also introduces electrodes, which are conductors placed in liquids to allow electric current to pass. Students learn about positive and negative terminals and their role during chemical reactions.
Electroplating and Its Uses
Electroplating is one of the most interesting applications discussed in this chapter. It is the process of depositing a thin layer of one metal over another using electric current.
For example, objects made of iron are often coated with chromium or nickel to protect them from rusting and improve their appearance. Jewellery is sometimes coated with gold or silver through electroplating to make it attractive and affordable. The chapter explains how electroplating is widely used in industries to improve the durability and appearance of products. Bicycle handlebars, bathroom fittings, kitchen utensils, and car parts are common examples of electroplated objects. Students understand that electroplating not only enhances beauty but also prevents corrosion and increases the lifespan of materials. The exemplar solutions provide detailed explanations and practical examples that make this topic highly engaging.
Importance of NCERT Exemplar Questions in Exam Preparation
The NCERT Exemplar Solution and questions for Chapter 14 are designed to improve conceptual understanding and scientific reasoning. These questions encourage students to think beyond memorization and apply concepts in practical situations.
Students get practice with multiple-choice questions, short-answer questions, and activity-based exercises that strengthen problem-solving skills. Detailed solutions help learners understand the logic behind every answer and remove confusion during revision. Regular practice also improves answer-writing techniques and scientific vocabulary. Students learn how to explain experiments, observations, and conclusions in a structured format suitable for examinations. Teachers often recommend exemplar questions because they cover important concepts from different perspectives. Solving these questions regularly increases confidence and prepares students for higher-level science topics in future classes.
The chapter becomes more interesting when students realize how electricity is used in industries, manufacturing, and scientific applications around them. This practical connection makes learning more meaningful and enjoyable.
Real-Life Applications of Chemical Effects of Electric Current
The chemical effects of electric current are used in many industries and technologies. Electroplating helps protect metals from rusting and improves product quality. Purification of metals and extraction processes in industries also depend on chemical reactions caused by electricity. Medical equipment, batteries, and water purification systems use principles related to conducting liquids and electric current. Understanding these concepts helps students appreciate the importance of science in modern life.
The chapter encourages curiosity and scientific thinking by showing how simple classroom experiments are connected to real industrial processes. This practical understanding helps students develop a stronger interest in science and technology.