CHAPTER 2- ACIDS, BASES AND SALTS 1. Write the name of any one natural indicator. 2. A substance changes red litmus to blue. Write the nature of the substance. 3. What do you understand by neutralization reaction? Give an example. 4. Why do we take antacid to get relief from acidity? 5. Write an equation to show the reaction between Plaster of Paris and water. 6. Name the sodium compound which is used for softening hard water. Also write its chemical formula. 7. Write three differences between acids and bases. 8. (a) What happens when CO, is passed through lime water? (b) What do we observe when excess of CO is passed through lime water?(c) Write balanced chemical reactions in both cases. 9. (a) Write down the chemical name and chemical formula of bleaching powder. (b) How is it prepared? (c) Write down two applications of bleaching powder. 10. What is range of pH in which our body works?