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Acids Bases and Salts Test - 3

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Acids Bases and Salts Test - 3
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  • Question 1
    1 / -0

    Litmus solution is a purple dye, which is extracted from

    Solution

    Litmus solution is a purple dye, which is extracted from Lichen, a plant belonging to division Thallophyta and is commonly used as an acid-base indicator.

     

  • Question 2
    1 / -0

    Which of the following is a base?

    Solution

    Metal oxides, metal hydroxides and metal carbonates, all are basic in nature.

     

  • Question 3
    1 / -0

    In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations. ,  
    Sample taken      pH paper colour turned to , 

    (I) Water                    Green

    (II) Dil. HCl                 Red

    (III) Dil. NaOH            Blue

    (IV) Dil. acetic acid    Orange

    Que - Which one will have pH value of 7?

    Solution

    Sample I will show up pH = 7 since water is neutral and hence turns the pH paper green.

     

  • Question 4
    1 / -0

    Citric acid is an example of

    Solution

    Organic acids are acids present in plant materials and animals. Citric acid is found in oranges.

     

  • Question 5
    1 / -0

    Antacids used to treat indigestion in the stomach contains

    Solution

    The pH of our digestive system is acidic due to presence of HCl. Antacids are bases which give relief from pain and acidity. Common antacid used to treat indigestion is magnesium hydroxide.

     

  • Question 6
    1 / -0

    Hydrogen and respective metallic sulphates are produced when metals react with

    Solution

    Metals react with dilute sulphuric acid to produce hydrogen with the formation of their respective metallic sulphates.

    Mg + H2SO4 → MgSO4 + H2 ↑

    Zn + H2SO4 → ZnSO4 + H2 ↑

    Fe + H2SO4 → FeSO4 + H2 ↑

     

  • Question 7
    1 / -0

    Which of the following substances is used for supporting fractured bones?

    Solution

    CaSO4.1/2 H2O commonly known as plaster of paris is used for supporting fractured bones.

     

  • Question 8
    1 / -0

    A substance 'A' does not dissociate completely into its ions in aqueous solutions. It is bitter in taste and soapy to touch. Identify the substance A.

    Solution

    A base is bitter in taste and soapy to touch. A weak base does not dissociate completely into its ions in aqueous solutions.

     

  • Question 9
    1 / -0

    Rain water with a pH less than 5.6 is called

    Solution

    Rain water with a pH less than 5.6 is called Acid rain.

     

  • Question 10
    1 / -0

    Water soluble bases are called

    Solution

    Water soluble bases are called alkalis.

     

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