Redox Reactions

Key Concepts

1. What is redox reaction?
2. Types of redox reactions.
3. Balancing of redox reactions various methods
   • Oxidation number method
   • Ion electron method
   • Algebraic method

Prior Knowledge

1. Molecular formula and chemical name
   • https://saitechinfo.com/molecular-formula-drill/
2. Determination of oxidation number
   • https://saitechinfo.com/determination-of-oxidation-number-worksheet/
   • https://youtu.be/Ssv4xC0afGg?si=vtTCrZFMQUhkaDss
3. Identifying oxidising and reducing agents
   • https://youtu.be/LK0tCLJ5VJI?si=PBtdDjqwkpwuT3Oj

Rust formation is the best example of redox reactions. The rust on car wheel rims occurs due to the oxidation of iron when exposed to moisture and oxygen over time. This process is accelerated in the presence of road salts, humidity, and poor maintenance. Here’s how rust forms and how to manage or prevent it:

Causes:

1. Moisture: Rain, snow, or washing water trapped on the rim surface leads to rust.
2. Road Salt: Salt used in de-icing accelerates the corrosion process.
3. Scratches or Chips: Damage to the protective coating exposes the metal underneath to air and water.
4. Poor Maintenance: Dirt and debris left on the rim can retain moisture, promoting rust.

Prevention:

1. Regular Cleaning: Clean rims thoroughly using soap and water to remove dirt, salt, and grime.
2. Wax or Protective Coatings: Apply wax or specialized rim protectors to prevent direct exposure to water and oxygen.
3. Inspect for Damage: Repair scratches or chips in the paint or coating promptly.
4. Dry Thoroughly: After washing or driving in wet conditions, dry the rims completely.
5. Anti-Rust Treatment: Use anti-rust sprays or coatings designed for automotive parts.

Treatment:

1. Rust Removal:
   • Sand the affected area with sandpaper or a wire brush to remove rust.
   • Use a rust remover solution or vinegar for stubborn rust.
2. Repainting:
   • Apply a rust-inhibiting primer to the cleaned surface.
   • Paint with durable automotive paint or rim-specific paint.
3. Replace Severely Damaged Rims: If the rust is extensive and compromises structural integrity, replace the rim.

Video Lectures

Identifiying oxidising agents and reducing agents

Determination of oxidation number of nitrogen in different oxides.

Balancing of Redox Reactions

Oxidation number method of balancing redox reactions

Redox reactions part-1

Redox reactions part-2

Balancing of Redox Reactions by Ion electron method (Half cell method)

Redox reactions in d block elements – KMnO4 and K2Cr2O7

Balancing of Redox reactions by oxidation number method

Half cell method

d Block Redox reactions

The Chemistry of Rusting

Ion Electron method

Redox reactions part-1

Redox reactions part-2

Ion electron method

Reaction of phophorus with water in alkaline medium – ion electron method

Board Exam Question in Redox reaction – analysis

KMnO4 with Iodide in acidic and alkaline media

Calculation of Cell EMF

Balancing of Chemical Equation by Algebraic Method