UPSC CSE Prelims 2006 Q6 — Science & Technology PYQ with Answer

Consider the following statements:

1. Caffeine, a constituent of tea and coffee, is a diuretic.

2. Citric acid is used in soft drinks.

3. Ascorbic acid is essential for the formation of bones and teeth.

4. Citric acid is a good substitution for ascorbic acid in our nutrition.

Which of the statements given above are correct?