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Acids Bases and Salts Test - 16

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Acids Bases and Salts Test - 16
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  • Question 1
    1 / -0

    Which one of the following will turn red litmus blue?

    Solution

    The vinegar should turn the blue litmus paper red; the water should not change the color of either paper, and the baking soda water should turn red litmus paper blue.

     

  • Question 2
    1 / -0

    Name an element which is common to all acids?

    Solution

    All acids contain hydrogen, but not all hydrogen-containing compounds are acids. Most acids also contain oxygen. Acids dissociate in water to produce hydrogen ions. Basically, acids are just ionic compounds that contain hydrogen. A strong acid completely ionizes, breaking down into positive hydrogen ions and negatively charged ions.

     

  • Question 3
    1 / -0

    The pH of the gastric juices released during digestion is

    Solution

    The pH of gastric juice secreted by the oxyntic or parietal cells of the stomach is acidic in nature. The protein digesting enzymes of the stomach such as pepsin do not work well in basic medium so the pH is maintained between 1.5 to 3.5 in the stomach.

     

  • Question 4
    1 / -0

    Preservatives are used to preserve

    Solution

    Preservatives are added to food to fight spoilage caused by bacteria, molds, fungus, and yeast. Preservatives can keep food fresher for longer periods of time, extending its shelf life.

     

  • Question 5
    1 / -0

    How does a base solution feel in touch?

    Solution

    Bases are the substances which are bitter in taste and soapy in touch, they turn red litmus solution blue. They give OH− ions in aqueous solution.

     

  • Question 6
    1 / -0

    What happen when lime water Ca(OH)2 (aq) reacts with carbon dioxide CO2?

    Solution

    When Ca(OH)2 (aq) reacts with carbon dioxide CO2 then CaCO3(s)+H2O(l) is formed with white precipitate.

     

  • Question 7
    1 / -0

    An acid which is completely ionized in water and produces (H+) is called

    Solution

    An acid which is completely ionized in water and produces (H+) is called Strong Acid.

    Examples: Hydrochloric acid (HCl), Sulphuric acid (H2SO4), Nitric acid (HNO3).

     

  • Question 8
    1 / -0

    What is the formula of bleaching powder

    Solution

    Bleaching powder is also known as chloride of lime. It is a solid and yellowish white in colour. Bleaching powder can be easily identified by the strong smell of chlorine.

    When calcium hydroxide (slaked lime) reacts with chlorine, it gives calcium oxychloride (bleaching powder) and water is formed.

     

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