1. CHEMISTRY DEPARTMENT WAID ACADEMY Standard Grade Topic 5

2. Which of the following is the test for oxygen ? 1.Oxygen turns lime water milky. 2.Oxygen relights a glowing splint.. 3.Oxygen burns with a 'pop‘. 4.Oxygen extinguishes a flame. 20

3. Which of the following shows the approximate composition of the air? 1.Nitrogen 10% Oxygen 90% 2.Nitrogen 20% Oxygen 80% 3.Nitrogen 90% Oxygen10% 4.Nitrogen 80% Oxygen 20% 20

4. What is meant when fossil fuels are described as being finite? 1.Fossil fuels are difficult to find. 2.Fossil fuels take a long time to form. 3.Fossil fuels cannot be replaced. 4.Fossil fuels are expensive. 20

5. The compounds found in crude oil and natural gas are mainly 1.hydrocarbon compounds. 2.carbohydrate compounds. 3.pure carbon. 4.sulphur containing compounds. 20

6. A hydrocarbon compound contains 20 1.hydrogen, carbon and oxygen only. 2.hydrogen and carbon only. 3.hydrogen, carbon and sulphur only. 4.hydrogen, carbon, oxygen and sulphur only.

7. When a hydrocarbon burns in a plentiful supply of air it forms 20 1.Carbon dioxide only. 2.Carbon dioxide and carbon monoxide. 3.Carbon monoxide and water. 4.Carbon dioxide and water.

8. The process used to separate crude oil into useful components in an oil refinery is called. 20 1.Filtration. 2.Fractional distillation. 3.Evaporation. 4.Purification.

9. Which of the oil fractions shown is the most viscous? 20 1.Refinery gas. 2.Kerosene. 3.Petrol. 4.Residue.

10. Which of the oil fractions shown is used as diseel fuel? 20 1.Gas Oil. 2.Naphtha. 3.Petrol. 4.Kerosene.

11. Identify the poisonous gas produced during the incomplete combustion of hydrocarbons. 20 1.SO 2. 2.NO 2 3.CO 4.CO 2