1. Which is a natural colloid?
a) Sodium chloride
b) Urea
c) Blood
b) Cane sugar

2. Ultraviolet rays can be used in water treatment as _____
a) Flocculator
b) Precipitator
c) Hydrolyser
d) Disinfectant

3. Natural rubber is a polymer of ______
a) Styrene
b) Vinyl acetate
c) Propene
d) Isoprene

4. Gobar gas contains mainly
a) Butane
b) Carbon dioxide
c) Methane
d) Carbon monoxide

5. The pH of pure water is ______
a) 7
b) 14
c) 0
d) 1

6. Plaster of Paris is made from
a) Limestone
b) Gypsum
c) Marble
d) Bauxite

7. The science which deals with drugs is _______
a) Physiology
b) Odontology
c) Pharmacology
d) Chronology

8. The gas used to extinguish fire is ________
a) Neon
b) Nitrogen
c) Carbon dioxide
d) Carbon monoxide

9. Which of the following is used in making artificial sweetener saccharine?
a) Benzene
b) Toluene
c) Phenol
d) Aniline

10. Brine refers to ________
a) Salt water
b) Sweet Water
c) Pure water
d) Starch water