Worksheet Chapter 6: Acid and Alkali

1. True or False: Acids show their acidic properties even in the complete absence of water.

2. Describe THREE applications of neutralisation in daily life or industrial operations.

3. True or False: An antacid tablet works by neutralising excess hydrochloric acid in the human stomach.

4. Write word equations for the following neutralisation reactions: (a) Hydrochloric Acid + Sodium Hydroxide → ________ + ________ (b) Sulphuric Acid + Potassium Hydroxide → ________ + ________

5. State TWO physical properties of an alkali.

6. Explain why dry blue litmus paper does not change color when tested with solid oxalic acid crystals, but turns red when water is added.

7. Fill in the blank: The chemical reaction between an acid and an alkali to produce salt and water only is known as ________.

8. A farmer finds that his crops are not growing well because the soil has become too acidic. (a) Suggest a substance the farmer can add to treat the soil. (b) Explain how this substance helps.

9. Which indicator turns pink in an alkaline solution and remains colorless in an acidic solution?

10. A student carries out a laboratory titration between dilute Hydrochloric Acid and 25 cm³ of Sodium Hydroxide using phenolphthalein indicator. (a) Describe the color change at the end point. (b) What chemical reaction has taken place when the end point is reached?