1. CHEMISTRY DEPARTMENT WAID ACADEMY Standard Grade Topic 14

2. Which three plants have nitrogen fixing bacteria in root nodules? 20 1.Peas, beans and clover. 2.Peas, beans and carrots. 3.Beans, carrots and potatoes. 4.Peas, beans and potatoes.

3. Which three elements are essential for healthy plant growth? 1.Nitrogen, phosphorus and sulphur. 2.Nitrogen, phosphorus and potassium. 3.Nitrogen, sulphur and potassium. 4.Sulphur, potassium and phosphorus. 20

4. What is the function of the nitrogen fixing bacteria present in plants such as peas? 30 1.The bacteria turn nitrogen in the air directly into ammonia. 2.The bacteria break down nitrate compounds in the soil directly into ammonia. 3.The bacteria turn ammonia in the air directly into nitrate compounds in the soil. 4.The bacteria turn nitrogen in the air directly into nitrate compounds in the soil.

5. In nature nitrogen is recycled between the soil and the atmosphere by 30 1.farmers adding artificial fertilisers to the soil. 2.farmers using natural fertilisers such as compost and manure. 3.the decay of deal plants and animals. 4.farmers planting peas and beans in their fields every 2 or 3 years.

6. In the Haber process ammonia is manufactured using the reactants 25 1.nitrogen and water 2.ammonium nitrate and soda lime 3.hydrogen and air 4.nitrogen and hydrogen

7. The catalyst used in the Haber Process is 20 1.platinum 2.iron 3.lead 4.an enzyme

8. The reaction conditions used in the Haber Process are 30 1.1 atm. pressure and room temperature. 2.1000 atm. pressure and 200 o C 3.200 atm. pressure and 500 o C 4.1000 atm. pressure and 1000 o C

9. The test for ammonia is that 30 1.It turns moist pH paper blue. 2.it is very soluble in water. 3.it turns moist pH paper orange. 4.It has a characteristic smell.

10. Ammonia can be prepared in the laboratory by 30 1.heating a mixture of nitrogen and hydrogen. 2.heating a mixture of an ammonium compound and hydrochloric acid. 3.heating a mixture of an ammonium compound and an alkali. 4.reacting ammonium hydroxide and nitric acid.

11. What is the percentage of nitrogen in ammonium nitrate, NH 4 NO 3 ? 60 1.17.5% 2.25% 3.35% 4.40%