CHEMISTRY DEPARTMENT WAID ACADEMY

1. CHEMISTRY DEPARTMENT WAID ACADEMY Unit 1 Acids and Alkalis

2. 12 Acid solutions have a pH value of • Between 5 and 9. • Equal to 7. • Less than 7. • More than 7

3. 12 Pure water has a pH value of • 3 • 6 • 7 • 9

4. 12 Which of the following pH values shows the most alkaline solution? • 1 • 6 • 9 • 14

5. 12 The pH scale goes from • Below 0 to above 14 • 0 to 10 • 1 to 13 • 5 to 12

6. 16 In which line are all three substances acidic? • vinegar, baking soda and oven cleaner • lime water, Coke and lemonade • bleach, baking soda and limewater • vinegar, Coke and lemonade

7. 16 In which line are all three substances alkaline? • vinegar, baking soda and sodium hydroxide • sodium hydroxide baking soda and limewater • lime water, Coke and lemonade • lime water, Coke and ammonia solution

8. 20 Which is a true statement about what happens when water is added to an acid solution? • The pH rises and the acidity decreases. • The pH decreases and the acidity decreases. • The pH rises and the acidity increases • The pH decreases and the acidity increases

9. 16 The salt formed when nitric acid is neutralised using potassium hydroxide is • Potassium chloride • Potassium nitrate • Sodium nitrate • Potassium sulphate

10. 20 Which line shows the products of the reaction between an acid and a metal carbonate? • A salt and water • Water and carbon dioxide • A salt and hydrogen. • A salt, water and carbon dioxide

11. 20 Which line shows the two gases mostly responsible for causing acid rain? • Carbon dioxide and oxygen • Sulphur dioxide and carbon dioxide • Sulphur dioxide and nitrogen dioxide • Nitrogen dioxide and carbon dioxide