ICSE Worksheet for Chapter - 9 Electrolysis Class 8

Worksheets For class 8

Find ICSE Worksheet for chapter-9 Electrolysis class 8

CLASS-8

1. BOARD: ICSE
2. Chemistry Worksheet - 9
3. TOPIC: Electrolysis
4. For other ICSE Worksheet for class 8 Science check out main page of Physics Wallah.

    

SUMMARY-

• Electrolyte – (strong and weak).
• Electrolytic cell, electrodes.
• Electrolysis – Definition.
• Electrolysis of –
  1. Molten sodium chloride.
  2. Acidified water.
  3. Copper sulphate solution.
• Applications of electrolysis-
  1. Electroplating.
  2. Electrorefining.

SECTION -1

1. Select the correct answer :
   1. A covalent compound which in aqueous solution conducts electricity is_______(NH₃/CCl₄)
   2. Electrolysis is ___________(redox reaction/precipitation reaction)
   3. ___________ (H₂CO₃, H₂SO₄) is a weak electrolyte.
   4. ___________ (C₆H₁₂O₆, CuSO₄) is a non-electrolyte.
2. Complete each of the following statement with the help of a suitable word or a statement.
   1. An electrically charged atom is called ________.
   2. Calcium atom becomes a calcium ion by ________.
   3. A ferric ion becomes a ferrous ion by _________.
   4. The gas given off at cathode during the electrolysis of acidulated water is _______.
   5. The solution of a substance which conducts electricity is called _______.
   6. Electrolysis is the passage of _________ through a liquid or a solution accompanied by a ________ change.
3. Give the equations for the reactions at the cathode and anode for the following :
   1. Electrolysis of molten sodium chloride
   2. Electrolysis of acidulated water
   3. Electrolysis of copper sulphate solution.
4. Give two example for each of the following :
   1. Strong electrolyte
   2. Weak electrolyte
   3. Non-electrolyte
   4. Substances used to make electrodes
5. State three applications of electrolysis.

    

SECTION -2

1. Differentiate between :
   1. Cation and anion.
   2. Cathode and anode.
   3. Electrolyte and non-electrolyte.
   4. Strong electrolyte and weak electrolyte.
2. What is electroplating ? In the electroplating of an article by nickel name the cathode, anode and metal ions present in the electrolyte
3. Define the following statements with suitable example:
   1. Weak electrolyte
   2. Anode and cathode
   3. Ion
4. What is electrometallurgy ? What kind of metals are extracted by electrometallurgy and why ?
5. Why is it necessary to add acid to water before proceeding with the electrolysis of water?