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9th Science - Acids, Bases and Salts Model Question Paper Oct-12 , 2019

Acids, Bases and Salts 

9th Science - Acids, Bases and Salts Model Question Paper

Acids, Bases and Salts Model Question Paper

9th Standard

    Reg.No. :
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Science

Time : 01:30:00 Hrs
Total Marks : 50
    5 x 1 = 5

  1. Zn + 2HCl \(\longrightarrow \) ZnCl2 + ____\(​​​​\uparrow \)(H2' O2' CO2)

    (a)

    H2

    (b)

    O2

    (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)

    SO4

  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)

    Pink

    6. 5 x 1 = 5

  6. Acid reacts with base to form a neutral product called_____

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    Salt

  7. _________ contain one or more replaceable hydrogen atoms

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    Acids

  8. Acids react with metallic oxides to produce______

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    salt and water

  9. _______acid is used in aerated drinks

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    Carbonic acid

  10. ______are bitter in taste

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    Bases

    11. 5 x 1 = 5

  11. Tomato

    12. (1)

    Removing black stains

  12. H3O+

    13. (2)

    Alkaline soil

  13. Oxalic acid

    14. (3)

    Hydronium ion

  14. Hardest substance in our body

    15. (4)

    Calcium phophate

  15. Citrus fruits

    16. (5)

    Oxalic acid
    5 x 2 = 10

  16. Complete the equation Mg+? ⟶ ?+H2

  17. Complete the equation CaO+H2SO4 ⟶ ?+H2O

  18. Interpret: CH4 and NH3 are not acids

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

  20. Interpret: NHSO4 is an acid salt

    21. 5 x 3 = 15

  21. Name any two metals which do not react with sodium hydroxide.

  22. Write any four uses of acids.

  23. What are the various uses of Aquaregia.

  24. Define aquaregia.

  25. What is neutralization reaction? Give an example.

    26. 2 x 5 = 10

  26. Write any four uses of bases.

  27. Write any five uses of salts.

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