Acids, Bases and Salts

ACID BOSES AND SALTS

SHORT ANSWER TYPE QUESTIONS (SAQ)

1. What is the chemical formula of soda ash? Answer : Na2CO3 Soda Ash is the common name for sodium carbonate, which...

SHORT ANSWER TYPE QUESTIONS (SAQ)

1. Describe an activity to show that the effect of base is nullified by addition of an acid and vice versa. What is the...

2. Answer the following questions: (i) What is the importance of pH in everyday life? (ii) Why does tooth decay start wh...

3. Classify the following salts as acidic, basic or neutral salts. Answer : Potassium sulphate, ammonium chloride, S...

4. Define water of crystallisation with two examples. How will you prove their existence in the examples given by you?...

5. Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for th...

6. Answer the following questions : (i) Define olfactory indicators. Name two substances which can be used as olfactory...

7. Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate. Giving an activity to illustrat...

8. Answer the following questions: (i) While diluting an acid, why is it recommended that the acid should be added to wa...

9. Answer the following questions : (i) A white power is an active ingredient of antacids and is used in preparation of...

10. Write a chemical equation to describe how baking soda is produced on a large scale. Also, write chemical name of the...

11. How is sodium hydroxide manufactured in industries? Name the process. In this process a gas X is formed as by-produc...

12. Identify the acid and the base from which sodium chloride is obtained. Which type of salt is it? When is it called r...

13. A few crystals of copper sulphate are heated in a dry boiling tube: (i) What is the colour before and after heatin...

14. 2 ml of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the...

15. A student dropped few pieces of marble in dilute hydrochloric acid, contained in a test- tube. The evolved gas was t...

16. Illustrate any three chemical properties of acids with examples. Answer : 1. Reaction with Metals: Acids react wi...

17. Naman and Raghav performed an experiment in which they mixed concentrated sulphuric acid with water. Naman mixes wat...

18. Answer the following questions: (i) What is the action of litmus on : (a) Dry litmus paper (b) Solution of ammonia...

19. Answer the following questions : (i) How is pH paper used to find the pH of a solution? (ii) The pH value of water i...

20. What is the colour of FeSO4.7H2O crystals? How does this colour change upon heating? Give balanced chemical equation...

21. The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for it...

>22. A gas is liberated immediately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate p...

23. Answer the following questions: (i) Define a universal indicator. Mention one of its use. (ii) Solution A gives pin...

24. Lemon is used for restoring the shine of tarnished copper vessels. Why? Answer : When copper vessels are exposed...

25. List two observations when a pinch of sodium hydrogen carbonate is added to acetic acid in a test tube. Write a chem...

26. Name two salts each of calcium and magnesium which makes the water hard. Answer : These salts are: 1. Calcium...

27. A sanitary worker uses a white chemical having strong smell of chlorine gas to disinfect the water tank: (i) Identi...

26. Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red. (i)...

27. Answer the following questions : (i) State the number of water molecules present in crystals of washing soda and Pla...

28. Answer the following questions: (i) Two solutions X and Y are tested with universal indicator. Solution X turns oran...

29. Explain why an aqueous solution of sodium sulphate is neutral while an aqueous solution of sodium carbonate is basic...

30. What will be the action of liquid antacid on litmus paper? Is it acidic or basic? Answer : It is basic in nature...

31. What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry...

32. Answer the following questions : (i) What colour will be produced when we put a drop of distilled water on pH paper?...

33. What would a student report nearly after 30 minutes of placing duly cleaned strips of aluminium, copper, iron and zi...

34. Blue litmus solution is added to two test tubes A and B containing dilute HCl and NaOH solution respectively. In whi...

35. A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns...

36. What do you observe when you add few drops of acetic acid to a test tube containing : (i) Phenolphthalein (ii) Dis...

LONG ANSWER TYPE QUESTIONS (LAQ)

1. A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate b...

2. A remarkable property of acids is that they can 'dissolve' metals. When metals are added to an acid, they disintegra...

3. During the reaction of some metals with dilute hydrochloric acid, the following observations were made by a student:...

4. (i) State the chemical properties on which the following uses of baking soda are based: (a) As an antacid (b) As a so...

5. In the following schematic diagram for the preparation of hydrogen gas as shown in figure what would happen if follow...

6. For making cake, baking powder is taken. If at home your mother uses baking soda instead of baking powder in cake. (i...

7. A dry pellet of a common base B, when kept in open absorbs moisture and turns sticky. The compound is also a by-produ...

8. Answer the following questions: (i) Crystals of a substance changed their colour on heating in a closed test tube but...

9. Account for the following: (i) Rain water conducts electricity but distilled water does not. (ii) We feel burning s...

10. Write the name, method of preparation and uses of the following: (i) CaOCl2 (ii) CaSO2. 1...

11. Write uses of (i) Acids (ii) Bases (iii) Salts. Answer : (i) Uses of acid : 1. Hydrochloric acid is used in va...

NCERT SOLUTION

Page No. 18 1. You have been provided with three test tubes. One of them contains distilled water, and the other two...

Page No. 22 1. Why should curd and sour substances not be kept...

Page No. 25 1. Why do HCl, HNO 3, etc., show acidic characters in aqueous solutions while...

1. You have two solutions, A and B. The pH of solution A is 6 and the pH of solution B is 8. Which solution has mor...

1. What is the common name of the compound CaOCl2? The common name of the compound CaOCl2 is Bleaching Powder....

1. A solution turns red litmus blue, its pH is likely to be: Answer: A solution that turns red litmus blue is b...