The tip of the matchstick contains
1). phosphor us pentoxide
2). white phosphorus
3). red phosphorus
4). phosphorus trichloride
1. By which organic compound all the oils arc known ?
2. Which of the following vegetable oils does not contain essential fatty acids ?
3. Which one of the following contributes largely to the greenhouse effect ?
4. What is the chemical name for Baking Soda
5. The enzyme that converts glucose to ethyl alcohol is :
6. Piped Natural Gas (PNG) is used for
7. Question 14.13:What do you mean by Biochemical Oxygen Demand (BOD)?
8. The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :
9. Question 1.16:What do you mean by significant figures?
10. Silver halides are used in photographic plates because they are