Odia Medium Class 8 Science Chapter 11 Question Answer

BSE Odisha Class 8 Science Chapter 11: Chemical Effects of Electric Current (ବିଦ୍ୟୁତ୍ ସ୍ରୋତର ରାସାୟନିକ ପ୍ରଭାବ)

Mastering the concepts of Chemical Effects of Electric Current is essential for understanding how we use electricity to transform matter. At Odisha Board Solutions, we provide simplified, stepwise answers for Class 8 Science Chapter 11, specifically updated for the 2026-27 session.

1. Conductors and Insulators (ପରିବାହୀ ଓ କୁପରିବାହୀ)

Just like solids, some liquids allow electric current to pass through them while others do not.

  • Good Conductors: Liquids that conduct electricity are usually solutions of acids, bases, or salts (e.g., Tap water, Lemon juice).

  • Poor Conductors: Liquids like distilled water, honey, and vegetable oil do not conduct electricity well.

2. What is Electrolysis? (ବିଦ୍ୟୁତ୍ ବିଶ୍ଳେଷଣ)

When an electric current passes through a conducting solution, it causes chemical reactions. This is known as the chemical effect of electric current.

Key Observations during Electrolysis:

  1. Gas Bubbles: Bubbles of gas (Oxygen and Hydrogen) may be formed on the electrodes.

  2. Metal Deposits: Deposits of metal may be seen on the electrodes.

  3. Color Change: The color of the solution may change due to chemical reactions.

3. Electroplating: A Major Application (ବିଦ୍ୟୁତ୍ ପ୍ରଲେପନ)

The process of depositing a layer of any desired metal on another material by means of electricity is called Electroplating. This is one of the most common applications of the chemical effects of electric current.

Common Examples of Electroplating:

  • Chromium Plating: Used on car parts, bath taps, and bicycle handlebars because it is shiny and resists scratches.

  • Gold/Silver Plating: Used by jewelers to make less expensive metals look like gold or silver.

  • Zinc Plating (Galvanization): Coating iron with zinc to prevent rust and corrosion in bridges and automobiles.

4. LED: The Modern Tester (ଏଲ୍.ଇ.ଡି.)

Sometimes the electric current is too weak to make the bulb of a tester glow. In such cases, we use an LED (Light Emitting Diode) because it glows even with a very weak current.

  • Note: The longer lead of the LED is always connected to the positive terminal of the battery.

5. Download Class 8 Science Chapter 11 PDF (Odia Medium)

We offer a FREE PDF Download of the Class 8 Science Chapter 11 Questions and Answers. This PDF is optimized for Odia medium students to ensure the diagrams and scripts are perfectly clear, helping you maintain a high-quality standards.

Revision Tip: Practice the diagram of a simple electroplating circuit using copper sulphate solution, as it is a mandatory long-form question in the BSE Odisha SA2 exams.