You can now go through the concise explanations offered in these NCERT Solutions for Class 8 Science to get the utmost clarity on different concepts under the chapter Chemical Effects of Electric Current. Copper from impure rod is sought to be transferred to the thin copper plate. The articles to be plated should be cleaned throughly to remove dust, grease or any deposit on it. Students of class 8 will be writing national level exams … Class 8 is one of the crucial stages of a student’s life. [NCERT] Given here is the complete explanation of the lesson, along with all the exercises, Question and Answers given at the back of the lesson. (b) pole Question 6. Answer: Does lemon juice or vinegar conduct electricity? Question 5. Hydrogen and Oxygen. Class 8 Science Chapter 14 MCQ with Answers 1. If not, what can we do to make it conducting? You can refer to NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects of Electric Current to revise the concepts in the syllabus … How can the magnetic effect be used as a tester ? So, the compass needle showed deflection. Class 8 Science Chapter 16 Answers NCERT Solutions for Class 8 Science Chapter 16 Light is given below to download in PDF or view online without downloading. By volume of hydrogen gas is twice the volume of oxygen gas. Topics and Sub Topics in Class 8 Science Chapter 14 Chemical Effects of Electric Current: Question 1. Do you find a deflection in the compass (b) Alcohol Protection of the surface of bases metals which corrode for e.g., iron is plated with chromium. (i) liquid A is a better conductor than liquid B. Therefore, we can be electrocuted in case we touch appliances with wet hands. Hydroxyl ions (OH )move towards the anode and oxygen is collected on it. (b) chemical (d) Nitric acid Write its one use. Answer: Dinesh can study the chemical effect of current at home very easily. In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. If you are a student of class 8 who is using NCERT Textbook to study Science, then you must come across chapter 14 Chemical Effects of Electric Current . This chapter will strengthen your base for future complex topics. Answer: synthetic fibres and plastics class 8 notes. Question 11. Explain. Question 13. The Class 8 Science Chapter 14 Solutions are now made easy to understand all the concepts and topics related to the chapter precisely. LED is Light Emitting Diode. (b), Question 8. Question 16. When electric current is passed through copper sulphate solution, the copper sulphate breaks up into copper and sulphate ions. Maths Students who are looking for better solutions, they can download. Class 9 Science Chapter 10 Extra Questions and Answers Gravitation. Electroplating. The electrode, connected to the positive terminal of a battery, is called Do Liquids Conduct Electricity? A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Answer: The compass needle will show deflection with tap water, lemon juice and sodium chloride solution. (Instead of carbon rods, you may take two iron nails about 6 cm long.) Water is a solution of salts and so it is a good conductor of electricity. Air is an insulator of electricity. Question 1. He finds that the compass needle deflects more in the case of seawater. 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CBSE Class 8 Geography Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources – Detailed explanation of the chapter ‘Land, Soil, Water, Natural Vegetation and Wildlife Resources’ along with question answers. Good/Poor Conducting Liquids. … Answer: The salts separate out and deposit on the sides of the container. Question 12. What is the basic principle of electric pen ? The passage of an electric current through a solution causes ……………….. effects. The iodide ions (I- ) react with starch to turn blue black. Which one of the following is a weak electrolyte ? (d) The process of depositing a layer of any desired metal on another material by means of electricity is called _______ In containers, water evaporates slowly. Answer: Now connect one free end of the wire to the terminal of a battery. What is the disadvantage of electroplating done in the factories ? Class 8 Science Chapter 14 Chemical Effects of Electric Current So, the fire¬men shut off the electric supply before spraying water to save themselves and other people from electrocution. Vinegar, lemon juice and tap water. Chemical Effects of Electric Current Class 8 Extra Questions Science Chapter 14 Chemical Effects of Electric Current Class 8 Extra Questions Very Short Answer Questions Question 1. [NCT 2011] of distilled water in a clean and dry beaker. [NCERT] Clean copper plates with sand paper. First and second cap with acid and base respectively, conducts electricity whereas third cap having sugar dissolved in distilled water do not conduct electricity. Answer: The thick rod of impure copper plate is to be attached to the positive terminal of the battery because when electric current is passed through the copper sulphate solution, it gets dissociated into copper and sulphate. Add a teaspoonful of salt or a few drops of lemon juice to water to make it more conducting. (b) insulator What is the difference between current flowing through metals and current flowing through liquids ? A cell is an example of conversion of After removing the electrodes from the solution, we find that copper metal gets deposited on the plate at the negative of the battery. Answer: Chromium is used for electroplating because it has a shiny appearance, does not corrode and is scratch resistant. In each case observe whether the magnetic needle shows deflection or not. Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? [NCERT] Question 3. Answer: The water used in the water hoses is not pure water and is a good conductor of electricity. When People Rebel Class 8 Extra Questions and Answers Social Science History Chapter 5 CBSE Pdf free download are part of Extra Questions for Class 8 Social Science.Here we have given NCERT Extra Questions for Class 8 Social Science SST History Chapter 5 When People Rebel. A tester is used to check the conduction of electricity through two liquids, labelled A and B. When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Also Read : – Class 6 Science NCERT Solution NCERT Class 6 Science Chapter 14 […] Question 1. Thus, lemon juice, vinegar, tap water, milk, curd and water, and soda are good conductors of electricity while vegetable oil, honey, kerosene oil, and distilled water are poor conductors of electricity or insulators. (b) solids only. Can we do electroplating on it to protect is from corrosion ? Explain your answer. What colour is the coating? (c) semi-conductor It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. We have provided Chemical Effects of Electric Current Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Question 4. Question 6. Answer: Prepare a list of objects around you that are electroplated. (i) The wires in the circuit may be loosely connected. Leave your worries of acing the exams and refer to these guides to understand difficult concepts of Chemical Effects of Electric Current with ease. Explain. Noise pollution, its causes, impacts, and control measures are explained towards the finish off the chapter. Can we call the change taking place in the solution a chemical change? Connect the negative terminal of battery to the metal sheet. The bulb does not glow in the set-up shown in figure. Answer: Artificial jewellery is plated with silver or gold. Materials which do not allow electric current to flow through them are called insulators. (a) conductor We will need copper sulphate and two copper plates of size around 10 cm x 4 cm. and ………….. Why ? Bring your tester over this cap and let the ends of the tester dip into lemon juice or vinegar as shown in Fig. (b) coating Answer: Question 1. Question 8. The temperature around the electroplating equipment should be optimum. Take out carbon rods carefully from two discarded cells. NCERT solutions Class 8 Science Chapter 13 provided by Vedantu offers proper guidance for the students. The lesson covers the complete explanation of class 8 Chapter 9 Reproduction. NCERT Solutions for Class 8 Science Chapter 14 Chemical Effects of Electric Current What could be the reasons? Question 8. All Pollution of Air and Water Exercise Questions with Solutions to help you to revise complete Syllabus and Score More marks. (c) Sodium . Revise concepts such as synthetic fibres and types of synthetic fibres … No, it is not advisable for electrician to carry out electrical repairs during heavy downpour because water is a good conductor of electricity and the person can get shock. A metal is released in the electrolysis of a salt. (ii) The bulb may be fused. What can be the possible reasons for this ? Question 13. Answer: However, if the bulb does not glow, it means that the tester is not working. Define the following terms. Electrolytes conduct current at a slow rate than metals. Answer: (a) conduction Extra Questions for Class 9 Science Chapter 10 Gravitation with Answers Solutions. Answer: NCERT Solutions for Class 8 Maths Chapter 14 Factorisation. What are good conductors? Question 3. An electric current can produce (a) heating effect only. What results do you obtain? Answer: The longer lead (leg) from the LED should be connected to the positive terminal of the battery and the shorter lead to the negative terminal of the battery. Living Science 2019, 2020 Solutions for Class 8 Science Chapter 14 - Some Natural Phenomena Living Science 2019, 2020 Solutions for Class 8 Science Chapter 15 - Chemical Effects of Electric Current Living Science 2019, 2020 Solutions for Class 8 Science Chapter 16 - Reflection of Light Answer: The two free ends of wire are connected to the material to be tested. Now repeat Activity 14.2 using this tester. Objective Questions existing will help in scoring well in the board exams as they are highly scoring and give you an extra edge to … Answer: Materials which allow electric current to flow through them are called conductors. Answer: Place a small compass needle inside it. What is electrolysis ? Name one non-metal which a good conductor of electricity. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Answer: Answer: 14.6. If the magnetic compass shows deflection glows, it is a conductor, but if it does not deflect, it is an insulator. Activity 6 (NCERT Textbook, Page 176) LEDs emitting white light can be used instead of bulbs. Why ? The bulb does not glow even though the circuit is complete because the current is too small. Explain how it can be used for writing. Check the below NCERT MCQ Questions for Class 8 Science Chapter 13 Sound with Answers Pdf free download. Is air an insulator or conductor of electricity ? Gravitation Class 9 Extra Questions Very Short Answer Type. The deflection in magnetic needle shows that the circuit is complete and the solution conducts electricity, i.e., it is a good conductor. The bulb does not glow because distilled water is an insulator, since it does not have dissolved salts. Free PDF download of NCERT Solutions for Class 8 Science (Chemistry) Chapter 18 - Pollution of Air and Water solved by Expert Teachers as per NCERT (CBSE) Book guidelines. Activity 1 (NCERT Textbook, Page 173) (d) electro refining [NCERT] We have provided Sound Class 8 Science MCQs Questions with Answers to help students understand the concept very well. The NCERT Class 8 Science Chapter 14 Question Answer guide further offers students some details on why they shouldn’t use their bare hands while performing different tests. This process is known as chemical effects of current. Vedantu is a platform that provides free, and other study materials for students. Can you ex¬plain the reason? Answer: Answer: (a) anode Repeat the activity with other liquids such as tap water, vegetable oil, milk, honey. Dissolve two teaspoonfuls of copper sulphate in it. This happens because the when current is passed, the K+ ions are attracted to the metal sheet. CBSE Topper Answer Sheet; CBSE Sample Papers for Class 12; CBSE Sample Papers for Class 11; ... NCERT Solutions for Class 10 Science Chapter 14; ... RD Sharma Class 8: RD Sharma Class 7: CBSE Previous Year Question Papers Class 12: CBSE Previous Year Question Papers Class 10: NCERT Books: Maths Formulas: CBSE Sample Papers: Vedic Maths . NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations. So, the deflection of the compass needle is more. Can you explain the reason ? (a) acids, bases, salts Why ? Question 2. All questions and answers from the Living Science 2019 Book of Class 8 Science Chapter 14 are provided here for you for free. Now, check the Class 8 Science Chapter 14 question answer PDF on the main website of Vedantu. (b) cathode Answer: (c) electrolysis Question 9. Video Format solutions of all chapters are also available. In this activity the bulb glows which shows that lemon juice and vinegar both conducts electricity, hence they are good conductors of electricity. Subtopics of Class 8 Science Chapter 14 Chemical Effects of Electric Current. (iii) The cells may be used up. Mark ‘T’ if the statement is true and ‘F’ if it is false. We have Provided Motion Class 9 Science MCQs Questions with Answers to help students understand the concept very well. Electric current can produce magnetic effect also. Sound talks about the distinction between music and noise. Solution: Does pure water conduct electricity ? We should not do the experiments on electricity by using electric supply from the mains because there is large amount of current and the person using it can get electrocuted. Answer: The free copper, being positively charged, gets drawn to the negative terminal of the battery and gets deposited on it. Question 7. Can you explain the reason? What are insulators ? (c) negative … Electroplating is the process of depositing a thin film of one metal over another metal by passing electric current through an electrolyte. Answer: The Sound Class 8 NCERT solutions provide questions and answers from the NCERT books in a very detailed way. (c) half on the anode and half on the cathode Question 3. (d) Potassium It gets deposited on the In Class 8 Science Chapter 3, the descriptions of man-made fires and their uses are given. Answer: Rainwater is pure water which is an insulator but it gets mixed with air pollutants like sulphur dioxide and nitrogen oxides and form acidic solution, which is a good conductor of electricity. How are bridges and automobiles prevented from rusting ? Liquid A is a better conductor of electricity because the bulb glows more in it. Liquid B is a better conductor than liquid A. Answer: Use plating artificial jewellery with gold. Answer: Graphite. Electrolysis is the breaking up of a compound from its solution on passing electric current through the electrolyte. Question 9. Give some uses of LED. Answer: Now remove the electrodes from the solution and look at them carefully. Answer: Which properties of chromium make it useful for electroplating on iron ? Wrap copper wires around the metal caps of the carbon rods and join them to a battery (Fig. Answer: Answer: Which is the most common application of chemical effect of current ? Answer: The substances that […] as a point source of light in laser beam torches. (Remember to wash and wipe the ends of tester after testing each liquid). (c) Dilute sulphuric acid Compass needle shows deflection due to magnetic effect of electric current. Join the free ends of two wires momentarily. 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