SEBA Class 8 Science Important Chapter 8 Chemical Effects of Electric Current

SEBA Class 8 Science Important Chapter 8 Chemical Effects of Electric Current Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 8 General Science Additional Solutions and select need one. SCERT Important Solutions For Class 8 General Science Download PDF. Important Notes for Class 8 Science SCERT.

SEBA Class 8 Science Important Chapter 8 Chemical Effects of Electric Current

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 8 Science Additional Question Answer are part of All Subject Solutions. Here we have given SCERT Class 8 General Science Important Notes for All Chapters, You can practice these here.

Chemical Effects of Electric Current

Chapter: 8

PART – I

IMPORTANT QUESTION ANSWER

A. Very Short Type Question & Answer:

1. What is the main condition for a liquid to conduct electricity?

Ans: A liquid must contain dissolved ions to conduct electricity.

2. Why does a bulb glow in a tester circuit?

Ans: The bulb glows when electric current flows through the circuit and heats the filament.

3. Why do we use copper plates in electroplating?

Ans: Copper plates are used because they are good conductors of electricity and can easily be coated with other metals.

4. What happens during the electrolysis of water?

Ans: Water splits into hydrogen and oxygen gases at the electrodes when current flows through it.

5. What is electroplating?

Ans: Electroplating is the process of depositing a thin layer of metal on the surface of another object using electric current.

6. Why is distilled water a poor conductor of electricity?

Ans: Distilled water lacks dissolved salts and ions, which are necessary for conducting electricity.

7. What is the effect of electric current on a conducting solution?

Ans: It causes chemical reactions, which can result in gas formation, color changes, or metal deposition on the electrodes.

8. What is the role of a battery in the tester circuit?

Ans: The battery provides the voltage needed to push the electric current through the tester and the liquid.

9. What are the gases produced when current passes through water?

Ans: Hydrogen and oxygen gases are produced.

10. Why should we never handle electrical appliances with wet hands?

Ans: Water conducts electricity, and wet hands can lead to electric shock or injury.

B. Fill in the Blanks:

1. Electric current passing through a conducting solution causes ________.

Ans: Chemical reactions.

2. The process of depositing a layer of metal on another metal using electricity is called ________.

Ans: Electroplating.

3. Distilled water is a ________ conductor of electricity.

Ans: Poor.

4. In electrolysis, ________ gas is produced at the positive terminal of the battery.

Ans: Oxygen.

5. An LED glows with ________ electric current.

Ans: Weak.

C. True or False:

1. Electroplating can only deposit gold on metal.

Ans: False.

2. Distilled water is a good conductor of electricity.

Ans: False.

3. The current passing through a conducting solution can produce gas bubbles at the electrodes.

Ans: True.

4. A conducting liquid can cause the tester bulb to glow only if the current is strong.

Ans: True.

5. Electrolysis splits water into hydrogen and oxygen gases.

Ans: True.