Acids, Bases and Salts Model Question Paper

9th Standard

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Science

Time : 01:30:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Zn + 2HCI \(\longrightarrow \) ZnCl2 + ____\(​​​​\uparrow \)(H2' 02' CO2)

    (a)

    H2

    (b)

    02

    (c)

    CO2

    (d)

    CO2

  2. Acids in plants and animals are organic acids. Whereas acids in rocks and minerals are_________

    (a)

    Inorganic acids

    (b)

    Weak acids

    (c)

    citric acid

    (d)

    ascorbic acid

  3. Since metal carbonate and metal bicarbonate are basic they react with acids to give salt and water with the liberation of__________

    (a)

    NO2

    (b)

    SO2

    (c)

    CO2

    (d)

    SO2

  4. The nature of the tooth paste commonly used is in nature

    (a)

    acidic

    (b)

    basic

    (c)

    neutral

    (d)

    neutral

  5. The hydrated salt of copper sulphate has______colour

    (a)

    Red

    (b)

    White

    (c)

    Blue

    (d)

    White

  6. 5 x 1 = 5
  7. Acid reacts with base to form a neutral product called_____

    ()

    Salt

  8. _________ contain one or more replaceable hydrogen atoms

    ()

    Acids

  9. Acids react with metallic oxides to produce______

    ()

    salt and water

  10. _______acid is used in aerated drinks

    ()

    Carbonic acid

  11. ______are bitter in taste

    ()

    Bases

  12. 5 x 1 = 5
  13. Tomato

  14. (1)

    Calcium phophate

  15. H3O+

  16. (2)

    Hydronium ion

  17. Oxalic acid

  18. (3)

    Alkaline soil

  19. Hardest substance in our body

  20. (4)

    Removing black stains

  21. Citrus fruits

  22. (5)

    Oxalic acid

    5 x 2 = 10
  23. Complete the equation Mg+? ⟶ ?+H2

  24. Complete the equation CaO+H2SO⟶ ?+H2O

  25. Interpret: CH4 and NH3 are not acids

  26. Interpret: Al(OH)3 & Zn(OH)2 are not alkalis.

  27. Interpret: NHSO4 is an acid salt

  28. 5 x 3 = 15
  29. Name any two metals which do not react with sodium hydroxide.

  30. Write any four uses of acids.

  31. When does the acid rain occur?

  32. Define aquaregia

  33. What is neutralization reaction? Give an example.

  34. 2 x 5 = 10
  35. Write any four uses of bases.

  36. Write any five uses of salts.

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