Class 8 Science Chapter 14 NCERT Solutions – Free PDF Download
The Class 8 Science Chapter 14 Solutions have been simplified to make it easier to grasp all of the chapter’s concepts and subjects. You can now check over the concise explanations provided in these NCERT Solutions for Class 8 Science to gain a better understanding of the various ideas covered in the chapter Chemical Effects of Electric Current. Leave your exam anxieties behind and use these tutorials to easily grasp challenging ideas in Chemical Effects of Electric Current. Now go to INFINITY LEARN’s main website and look at the Class 8 Science Chapter 14 question and answer PDF. INFINITY LEARN is a website that offers students free NCERT solutions and other study tools. Maths Students looking for better solutions can download Class 8 Maths NCERT Solutions to help them review the entire syllabus and improve their grades.
CHAPTER 14 _CHEMICAL EFFECTS OF ELECTRIC CURRENT
NCERT TEXTUAL QUESTIONS
1.Fill in the blanks :
a) Most liquids that conduct electricity are solutions of acids, bases and salts.
b) The passage of an electric current through a solution causes chemical
c) If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the negative terminal of the battery.
d) The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating.
2.When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason ?
A. The deflection in the compass needle shows that current is flowing through the wounded wire and hence, through the circuit. The circuit is complete since free ends of the tester are dipped in a solution. The solution is certainly a conducting solution. This is the reason why the compass needle shows a deflection.
3.Name three liquids, which when tested in the manner as shown in the figure, may cause the magnetic needle to deflect.
A. Liquids like lemon juice, salt water and vegetable oil allow electricity to pass through them.
4. The bulb does not glow in the setup shown in figure. List the possible reasons. Explain your answer.
A. The bulb may not glow because of the following reasons :
i) Liquid in the beaker is non – conducting. In such case, the electric current would not be able to pass through the liquid. Hence, the circuit is not complete.
ii) Electric current in the circuit is very weak. This can happen if the material used for making the circuit is not a good conductor of electricity or the battery may used up.
5. A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that
i) Liquid A is a better conductor than liquid B.
ii) Liquid B is a better conductor than liquid A.
iii) Both liquids are equally conducting.
iv) Conducting properties of liquid cannot be compared in this manner.
A. i) Liquid A is a better conductor than liquid B.
6. Does pure water conduct electricity ? If not, what can we do to make it conducting ?
A. No. Pure water does not conduct electricity. This is because pure water does not have any salts. Pure water can conduct electricity when salt is added to it, as salt solution is conducting in nature.
7.In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.
A. Water may conduct electricity. If the electrical supply for the area is not shut off and water is poured over electrical appliances, then electricity may pass through water and firemen may get electric shock. That is why, in case of a fire, the firemen shut off the main electrical supply for the area before they use the water houses.
8. A child staying in a coastal region tests the drinking water and also the seawater with his tester. He find that the compass needle deflects more in the case of seawater. Can you explain the reason?
A. Sea water contains more dissolved salts than the drinking water. Hence, it is more conducting than the drinking water. Hence, the compass needle deflects more in seawater than in the drinking water.
9. Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour ? Explain.
A. No. It is not safe to repair electrical appliances outdoors during heavy downpour. This is because rain water contains dissolved salts. Therefore, rain water can conduct electricity. The electrician may get electrical shocks while working outdoors during rain.
10.Paheli heard that rain water is as good as distilled water. So, she collected some rain water in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons ?
A. Rain water contains dissolved salts. This makes it a conducting solution. There are no dissolved salts present in the distilled water. Hence, rain water can allow electricity to pass through it while distilled water cannot.
11. Prepare a list of objects around you that are electroplated.
A. Examples of electroplated objects are as follows :
i) Chromium plating is done on different parts of cars, buses and motor cycles to give them shiny appearance.
ii) A fine layer of gold is deposited on the silver ornaments and they are called gold – plated ornaments.
iii) Iron used in constructing a building is coated with a layer of zinc. This protects iron from corrosion and rusting.
12.The process that you saw in Activity 14.7 (in NCERT Text Book) is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrodes should be attached to the positive terminal of the battery and why ?
A. Copper ion is positively charged. It is attracted towards the plate which is connected to the negative terminal of the battery. As copper ions are transferred to the thin copper plate, this thin pure copper plate must be connected to the negative terminal of the battery. Consequently, impure copper rod is connected to the positive terminal of the battery.
13. After doing the electroplating activity, if you interchanged the electrodes and repeated the activity. What would you observe at this time ?
A. If we interchange the two terminals after electroplating then the ions deposited on the plate will move again towards their original position.
Class 8 Science NCERT Solutions – Free PDF Download
Have you been having trouble finding dependable study materials to help you prepare for your upcoming exams? INFINITY LEARN has made it easy for you to understand key concepts in Chemical Effects of Electric Current by providing free NCERT Solutions for Class 8 Chapter 14 in PDF format, which includes all themes and subtopics as well as related question banks.
NCERT Solutions for Class 8 Science Chapter 14 – Chemical Effects of Electric Current
Electric Currents: An Overview
There are five sections in this NCERT Solutions Class 8 Science Chapter 14 guide. The first portion covers fundamental concepts about electric current and how it operates. Students will also learn why it is dangerous to touch any electrical item with damp hands. Chemical Effects of Electric Current also aims to assist pupils to understand how electricity passes from their bodies and which materials are good conductors for allowing electricity to flow freely.
Students will also study what constitutes a bad conductor, what might prevent electricity from traveling through these conductors, the operating mechanism, and much more. Students can use the Science Chapter 14 Class 8 PDF to discover everything they need to know about electricity, including whether or not they can pass electricity through specific materials. Chapter 14 also provides students with a variety of examples to help them grasp how electricity works. Finally, you will learn about whether or not liquids conduct electricity and which types of solids conduct electricity.
14.1 Do Liquids Conduct Electricity?
While the first part of Chapter 14 focuses on helping students comprehend what electricity is all about, this section explains whether or not liquids conduct electricity. This section entails completing a variety of exercises in order to determine whether liquids are good conductors of electricity. Students are recommended to be cautious and take all essential precautions while conducting these experiments in order to have a safe and educational experience. Every exercise in this section is designed to help students learn more about electrical regulations.
The NCERT Class 8 Science Chapter 14 Question Answer guide also provides students with information on why they should not undertake various tests with their bare hands. Additionally, kids will be taught about the dangers of electricity and how it can injure us. You’ll also learn about the heating effect that occurs when electricity is transferred through a certain filament of a bulb or even a copper wire linked by nails. Another fascinating idea you’ll learn about in this part is the difference between a weak and strong current.
14.2 Electric Current Chemical Effects
The NCERT Science Class 8 Chapter 14 PDF also provides a quick overview of the chapter’s third section, Chemical Effects of Electric Current. Students will study more about the fundamental effects of electric current in this section. The entire chapter is built on pupils performing physical experiments and activities in order to learn about the many impacts of electric current.
This section entails learning more about the various effects that occur when a current is passed through various conducting solutions. Students should go through these activity sections carefully to understand how electricity causes certain effects and how to protect themselves from getting shocked while conducting these activities.
Furthermore, you will learn more about William Nicholson, a British scientist who engaged in a number of tasks involving the analysis of different conditions of electrodes while they were passed through water.
Students will also learn about electrodes and some of their essential chemical effects in the NCERT Solutions of Class 8 Science Chapter 14 guide. There is also a full section dedicated to electroplating. Students will learn about what happens when electricity is sent through a copper sulphate solution and how copper sulphate is separated from sulphate and copper, as well as a brief process for doing so.
You’ll also learn about electro plating’s various applications and usage in real life. This section of the Class 8 Science Chapter 14 Solutions guide contains concise questions to aid students in their test preparation.
You must complete the surveys after thoroughly revising this chapter and undertaking distinguishing exercises. In this activity, you must answer around 12 questions. All of these questions are focused exclusively on the four key subjects described above, and they will test your knowledge of the Chemical Effects of Electric Current. The questions may be difficult to comprehend. As a result, pupils are required to read each question twice before responding.
Ncert Solutions for Class 8 Chapter 14: Key Features
- A few of the most important characteristics of NCERT answers for class 8 Chemical Effects of Electric Current are listed here.
- Acquire a thorough understanding of the various impacts of electric current.
- Recognize the various safety precautions to consider when undertaking operations that require transferring electricity through an object.
Learn more about the three subjects covered in depth in this chapter.