Bases

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  • Q1

    A base used for the manufacture of bleaching powder is

    Marks:1
    Answer:

    Calcium hydroxide.

    Explanation:

    Calcium hydroxide is used for the manufacture of bleaching powder.

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  • Q2

    An amphoteric hydroxide among the following is

    Marks:1
    Answer:

    Zn(OH)2.

    Explanation:

    The hydroxides of zinc, aluminium and lead are amphoteric, that is, they react with acids as well as bases to produce salt and water.

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  • Q3

    A compound of two non-metals that dissolves in water to form an alkali is

    Marks:1
    Answer:

    Ammonia.

    Explanation:

    Ammonia is made of two non-metals namely nitrogen and hydrogen. Ammonia dissolves in water to form ammonium hydroxide (an alkali).

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  • Q4

    When potassium reacts with water, potassium hydroxide is formed and a gas is evolved. The gas evolved is

    Marks:1
    Answer:

    hydrogen.

    Explanation:

    When potassium reacts with water, potassium hydroxide is formed and hydropgen gas is evolved.

     

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  • Q5

    An example of a weak base is

    Marks:1
    Answer:

    NH4OH

    Explanation:

    A weak base dissociates partially in aqueous solution to produce a few OH ions in solution.

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