Chapter 5 – Acids, Bases and Salts
Assignment 3
Q.1. How are salts named? Give two examples.
Q.2. If you get a turmeric (haldi) stain on your clothes while eating food, and try to wash it off with soap, the stain becomes red. Why? Find out how to remove haldi stains from clothes.
Q.3. Is the meaning of 'weak acid' the same as that of 'dilute acid'?
Q.4. The wastes of many factories contain acids. Why is it considered necessary to neutralize them before allowing the wastes to flow into water bodies?
Q.5. You are given equal quantities of two liquids in beakers. You are told that one of them is a strong acid and the other is a weak acid. Both are in concentrated from. You are also given a basic solution and an indicator. How will you determine which beaker has the strong acid and which has the weak acid?
Q.6. What do you mean by a neutralization reaction? How can a neutralization reaction be used to prepare common salt?
Q.7. Some acids are dangerous, other are not. Explain, giving examples.
Q.8. What are bases? What are their physical properties?
Q.9. Give two main uses each of
(a) calcium hydroxide
(b) ammonium hydroxide
(c) sodium hydroxide
Q.10. What is soap? How can you make soap in the laboratory?
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