SSC Ecology And Environment Sample Paper NCERT Sample Paper-3

  • question_answer
    When acid rain falls on buildings made of marble, what is the final product that flakes off easily?

    A)  Calcium carbonate

    B)  gypsum

    C)  Dolomite          

    D)  epsom

    Correct Answer: B

    Solution :

    [b] The sulfuric acid (in acid rain) reacts with limestone (or marble) in a neutralization reaction.  Limestone and marble buildings sometimes show blackened crusts that have peeled off to reveal crumbling stone beneath it. This black crust is called "gypsum". Gypsum is a mineral that forms from the reaction between calcite, water and sulphuric acid. Gypsum is soluble in water. It is usually washed away with time.

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