Question list – Acids, Bases and Salts

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Here is a question list for chapter 3- Acids, Base and Salts, Physical Science text book, TS.

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                                            Topic: Acid, Base and Salts

Short Q&A (2 or 1 marks)

  1. What are olfactory indicators? Give examples
  2. What colours do the following indicators turn when added to base
    1. Methyl orange    b. Red Litmus    c. Turmeric    d.Phenolphthalein
  3. Give the names of any 2 strong acids and any 2 weak acids.
  4. Give the names of any 2 strong bases and any 2 weak bases.
  5. Name a natural source for the following acids
    1. Citric acid    b.Acetic acid        c.Oxalic acid        d.Lactic acid
  6. What is an indicator? Give some examples.
  7. What are organic acids? What are mineral acids?
  8. You are provided with 3 test tubes, each containing distilled water, acid and base solution. If you are given only blue litmus paper, how do you identify the contents of the test tube.
  9. Complete the table
    Sample Solution Red Litmus Paper Blue Litmus Paper Phenolphthalein Methyl Orange
    HCl Red
    HNO3 Colourless
    NaOH Yellow
    Ca(OH)2 No change
  10. Which gas is evolved when acid reacts with metal? How do you test it?
  11. Why are acids not stored in metal containers?
  12. What happens when HCl is reacted with Aluminium metal. Write an equation.
  13. How is Sodium Zincate formed?
  14. What happens when dil.HCl is reacted with baking soda. Write an equation.
  15. A solution reacts with crushed egg shells to produce a gas which extinguishes a burning candle and also turns lime water milky. Identify the solution. Which gas is evolved? Write an equation for the given reaction.
  16. What is neutralisation reaction?
  17. Tap water conducts electricity but distilled water does not. Why?
  18. A metal compound A reacts with dil.HCl to produce effervescence. The gas evolved extinguishes a burning candle and also turns lime water milky. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.
  19. Why do aqueous solution of acids conduct electricity?
  20. Why does dry HCl gas does not change the colour of litmus paper?
  21. What happens when sulphuric acid is added to copper oxide?
  22. While diluting an acid, it is always recommended to add acid to water and never water to acid. Why?
  23. Equal length of Magnesium ribbon are dipped into test-tube A and test-tube B. Test-tube A contains aqueous HCl and test-tube B contains vinegar. In which test-tube will there be more fizzing (or more vigorous reaction) and why?
  24. What is alkali? Give example
  25. What is tooth decay?
  26. Ramesh was suffering from stomach pain due to indigestion. He was asked to take an antacid. Will antacid help in mitigating his pain? Justify.
  27. Give examples of antacids?
  28. Write a chemical reaction to prepare washing soda?
  29. How do you treat a honey bee sting?
  30. What is a Universal Indicator?
  31. Complete the table
    Sample Solution Colour on pH paper pH value Nature of Sample
    Soft drinks Weakly Acidic
    Blood Greenish-Blue
    Pure water 7
    Lemon Juice Acidic
    Toothpaste 8
    Milk of Magnesia Purple
  32. What is acid rain? How does it affect aquatic life?
  33. What is meant by brine solution?
  34. You have 2 solutions A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which solution is acidic?
  35. Give 2 examples of Acidic Salts.
  36. Give 2 examples of Alkaline Salts.
  37. Classify the given salts into Families- Calcium Chloride, Sodium Sulphate, Potassium Sulphate, Potassium Chloride, Ammonium Carbonate, Calcium Carbonate, Sodium Chloride, Potassium Nitrate.
  38. Write the formula for the following salts and identify the acid and bases from which these salts are obtained: Potassium Sulphate, Sodium Sulphate, Sodium Nitrate, Ammonium Chloride.
  39. What is Chlor-Alkali process?
  40. List the uses of products formed from Chlor-Alkali process.
  41. How is bleaching powder prepared? Write an equation.
  42. When baking powder is added to dough, it makes the cake soft and spongy. Why? Write a chemical equation.
  43. List the uses of washing soda.
  44. What is water of crystallization?
  45. List the uses of Calcium Sulphate Hemihydrate.
  46. How is gypsum prepared?
  47. What happens when copper sulphate crystals are heated?
  48. Five solutions A,B,C,D and E have pH as 4,1,11,7 and 9, respectively. Arrange the solutions in increasing order of hydrogen ion concentration. Classify the solutions as acidic, alkaline and neutral
  49. Why should Plaster of Paris be stored in water-proof container?
  50. To dil.HCl solution, Phenolphthalein was added and subsequently, Sodium Hydroxide solution was added drop-wise and an appearance of pink colour was observed. What do you infer from this observation?

4 Marks Q&A

  1.  Compounds such as alcohols and glucose contain hydrogen but are not categorized as acids. Describe an activity to prove it.
  2. Write an activity for the chemical reaction between metals with acids. How would you identify the gas which is released in this reaction?
  3. A white shirt has yellow stain of curry. When soap is rubbed on the shirt during washing, the yellow stain turns reddish-brown.
      1. Name the natural indicator present in the curry stain.
      2. Explain the changes in the color of the indicator which takes place during washing.
      3. What is the nature of soap as shown by the indicator.
  4.  You have two solutions A & B. The pH of0 solution A is 6. The pH of solution B is 8. Which solution has more hydrogen ion concentration? What colours will be seen on the universal indicator for A & B? Which solution is acidic / alkaline.
  5. Describe an activity show the reaction between metal carbonate and acid.
  6. Through an activity show the reaction between metal oxide and acid. From the product of the reaction, comment on the nature of metal oxide.
  7. Acids behave as acids only in solutions. Justify this statement through an activity.
  8. List and discuss the importance of pH in daily life.
  9. Through an activity, discuss on water of crystallization.
  10. Read the information given in the table and answer the following questions.
      1. List out the acids in the below table.
      2. What is the nature of the solution which gives pink color with Phenolphthalein solution.
      3. List out neutral solution
      4. Name the strongest acid and strongest base among the given solutions.

     

    Solution pH Value With Phenolphthalein With Methyl Orange
    HCl 1 No color change Turns into red
    Distilled water 7 No color change No color change
    NaOH 13 Turns into pink Turns into yellow
    Lemon juice 2.5 No color change Turns into red
    NaCl 7 No color change No color change
    Baking soda 8 Turns into pink Turns into yellow

     Questions