Take into account the time required for following processes. Classify them into two groups and give titles to the groups:

Cooking gas starts burning on ignition Iron article ungergoes rusting Erosion of rocks takes place to form soil Alcohol is formed on mixing yeast in glucose solution under proper condition. Effervescence is formed on adding baking soda into a test tube containing dilute acid A white precipitate is formed on adding dilute sulphuric acid to barium chloride solution

→ The above reactions can be classified as fast reactions and slow reactions as shown below: Fast Reactions Slow Reactions 1. Cooking gas starts burning on ignition 2. Iron article ungergoes rusting. 5. Effervescence is formed on adding baking soda into a test tube containing dilute acid. 3. Errosion of rocks takes place to form soil. 6. A white precipitate is formed on adding dilute sulphuric acid to barium chloride solution. 4. Alcohol is formed on mixing yeast in glucose solution under proper condition. 3 Marks