Federal 11th Unit 8 (Acids, Bases and Salts)

1. Water cannot act as

    a. lewis acid
    b. lewis base
    c. bronsted acid
    d. bronsted base

    lewis acid

    2. pH of 0.01M HCl solution is

    a. 10-2
    b. 10+2
    c. 2
    d. 1

    c. 2

    3. An aqueous solution of ammonium chloride is

    a. acidic
    b. basic
    c. neutral
    d. amphoteric

    a. acidic

    4. An aqueous solution of which compound will be basic

    a. ammonium nitrate
    b. ammonium acetate
    c. calcium chloride
    d. potassium carbonate

    d. potassium carbonate

    5. Which statement about acids is not correct ? An acid

    a. contains hydrogen ions in solution
    b. contains oxygen
    c. has a pH of less than 7
    d. gives off carbon dioxide from a carbonate

    b. contains oxygen

    6. If a liquid has a pH of 7

    a. it must be colorless
    b. it has boiling point of 100oC
    c. it must be neutral
    d. it must be a solution

    c. it must be neutral

    7. When air is bubbled through pure water , the pH is lowered from 7 to 5.6. Which gas in the air is responsible for this change

    a. argon
    b. carbon dioxide
    c. nitrogen
    d. oxygen

    b. carbon dioxide

    8. Which of following oxide is classified incorrectly

    a. ZnO amphoteric oxide
    b. CO2 acidic
    c. CO Neutral
    d. Na2O Basic

    c. CO Neutral

    9. If 25cm3 of 1M nitric acid is added to 50cm3 of 0.5 KOH solution, what would be the pH of the resulting solution

    a. 5
    b. 7
    c. 9
    d. 14

    b. 7

    10. If dry citric acid crystals are placed on dry litmus paper they will

    a. turn yellow
    b. turn green
    c. turn red
    d. remains unchanged

    d. remains unchanged

    11. A base is a substance that will neutralize an acid . Which of these is not a base

    a. Aq ammonia
    b. copper oxide
    c. potassium chloride
    d. sodium carbonate

    c. potassium chloride

    12. A strong acid is

    a. is always partially ionized when in solution
    b. is always fully ionized when in solution
    c. always decomposes carbonates
    d. always contains oxygen

    b. is always fully ionized when in solution

    13. Which one of the following oxides dissolves in water to form acidic solution

    a. MgO
    b. Na2O
    c. SO2
    d. SiO2

    c. SO2

    14. When crystal of copper sulphate are heated , the color changes from blue to white. This is due to

    a. loss of water only
    b. loss of water and SO2
    c. Reaction with CO2 in the air
    d. loss of water, SO2 and O2

    a. loss of water only

    15. The oxide of metal was found to react with HCl and aq NaOH solution.Which of following is best description of the oxide

    a. acidic
    b. basic
    c. amphoteric
    d. neutral

    c. amphoteric

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