These topics are highly relevant today and often impress external examiners due to their practical significance.
| Tea Sample | Mass of tea (g) | Mass of caffeine (mg) | Caffeine content (mg/g) | |------------|----------------|----------------------|-------------------------| | Black Tea (Brand A) | 5.0 | 160 | 32.0 | | Green Tea (Brand B) | 5.0 | 110 | 22.0 | | Local Loose Leaf | 5.0 | 195 | 39.0 | class 12 cbse chemistry investigatory project topics