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Acids Bases and Salts Test - 9

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Acids Bases and Salts Test - 9
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  • Question 1
    1 / -0

    Name an indicator which indicates the various levels of hydrogen ion concentration.

    Solution

    pH paper is used on which the strength of acidic and basic solutions is represented by making use of the hydrogen ion concentrations in them. 

  • Question 2
    1 / -0

    When concentrated  acid is added to H2O, the reaction 

    Solution

    On adding concentrated acid to water, a large amount of heat energy is evolved resulting in an exothermic reaction.

  • Question 3
    1 / -0

    The basic nature of sodium hydroxide (NaOH) is due to the presence of ____________ in solution.

    Solution

    Any compound behaves as a base when it dissociates hydroxide ions (OH-) in its solution.

  • Question 4
    1 / -0

    A liquid sample is suspected to be either an acid or water. You are provided a strip of red litmus paper. How would you confirm the nature of the sample? 

    Solution

    NaOH is a base that turns red litmus blue. Now add drops of both the samples separately on the blue litmus paper. The one that turns red will be acidic and the other that has no effect on blue litmus paper will be neutral in nature. This is because an acid turns blue litmus red and a neutral substance has no effect on litmus

  • Question 5
    1 / -0

    A bud of petunias become reddish purple after first shower of rain because

    Solution

    The buds of Petunia act as indicators and change their color in acidic medium.

    As the first shower of rain is acidic, therefore the buds of Petunia change their color.

  • Question 6
    1 / -0

    Which of the following is used in the refining of petroleum to remove sulphur and other compounds?

    Solution

    Sulphuric acid is used in refining of petroleum to remove sulphur and other impurities from it.

  • Question 7
    1 / -0

    Which of the following compound is/are acidic in nature?

    Solution

    Triple bonds are the most acidic in nature than other classes of compounds.

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