Class 10 Science 2. Acids, Bases and Salts Unit Test Papers

Chapter 2. Acids, Bases and Salts

Q1. What is the name given to a reaction between an acid and a base?

Q2. Name the raw materials used for preparing bleaching powder.

Q3. What is the chemical name and chemical formula of baking soda?

Q4. Under what soil conditions do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

Q5. What effect does the concentration of H+ (aq) have on the acidic nature of the solution?

Q6. A house-wife found that the cake prepared by her in hard and small in size. Which ingredient has she forgotten to add that would have made the cake fluffy. Give reason. 

Q7. Equal lengths of magnesium ribbon are taken in test tubes ‘A’ and ‘B’. Hydrochloric acid (HCI) is added to testtube A while acetic acid (CH3COOH) is added to test-tube ‘B’. In which test tube will the fizzing occur more vigorously and why?

Q8. Plaster of Paris should be stored in a moisture – proof container. Explain why?

Q9. Why do HCI, HNO3, etc. show acidic characters in aqueous solutions while solution of compounds like alcohol and glucose do not show acidic character?

Q10. You have been provided that three test-tubes? One of them contains distilled water and the other two contains an acidic solution and a basic solution respectively. If you are given red litmus paper, how will you identify contents of each test-tube?

Q11. A milkman adds a very small amount of baking soda to fresh milk”

(i) Why does he shift the pH of the fresh from ‘6’ to slightly alkaline?

(ii) What do you expect to observe when this milk comes to boil?

(iii) Why does this milk take a long time to set as cur?

Q12. A compound X of sodium form a white powder. It is a constituent of baking powder and is used in some antacid prescriptions. When heated, X gives out of a gas and steam. The gas forms a white precipitate with lime water. Write the chemical formula and name of X and the chemical equation for its decomposition on heating. What is its role in baking powder and in antacids?

Q13. Answer the followings.

(a) What is acid rain? How does it affect our aquatic life?

(b)What happens during a bee sting? What is its remedy?

(c)Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solution is a stronger acid? 

1.What is the colour change when you add blue litmus to sour substances? 2.Name two synthetic indicators. 3.Which acid is present in lemon juice? 4.Baking soda solution can be used as a remedy for which type of ailments? 5.What is meant by neutralization? 6.Name two natural indicators. 7.What is the colour of methyl orange in acidic solution? 8.What is meant by dilution? 9.What is a universal indicator? 10.On what factors does the strength of a base depend? 11.Give example of common antacid. 12.Write the chemical name & formula of bleaching powder. 13.Name the compound used for removing hardness of water. 14.Which gas is released when an acid reacts with a metal? 15.What are the salts of sulphuric acid called? 16.What is difference between washing soda and soda ash? 17.Give one point difference between an alkali and a base. 18.Name the natural source of acetic acid. 19.When metal carbonates react with acids which gas is produced? 20.What do all acids and bases have in common? 21.Give one example of strong acid and weak acid.

22.What is the chemical name of hardest substance in our body? 23.What is dead burnt plaster ? 24.What is milkiness due to when carbon dioxide gas is passed through lime water? 25.What are olfactory indicators ? 26.On what factors does the strength of an acid depend? 27.What happens when metal oxides react with acids? 28.Nmae four families of salts. 29.What happens when sodium hydrogen carbonate is heated? 30.What is the pH range between which our body works? 31.Why is sulphuric acid called king of chemicals? 32.What are anhydrous and hydrated salts? Explain with examples. 33.What is the difference between a strong base and weak base? Give two example of each. 34.What is deliquescent salt? Give example. 35.Why is tartaric acid added into baking soda to get baking powder? 36.With the help of chemical equation explain how a soda acid fire extinguisher helps in putting out fire. 37.A tarnished copper vessel begins to shine when rubbed with lemon. Why? 38.How is plaster of Paris different chemically different from gypsum? How may they be interconverted? 39.What is efflorescence? Give example. 40.Write any three chemical properties of acids. 41.What happens when chlorine is passed through slaked lime? 42.Define monobasic, dibasic and tribasic acids. 43.Define an acid in terms of ions. 44.What is the role of water in litmus test of an acid? 45. Define base in terms of ions. 46.Differentiate between acids and bases.