SSC General Science & Technology Sample Paper NCERT Sample Paper-1

  • question_answer
    Aluminium in the earth's crust is found as

    A)  Gypsum          

    B)  bauxite

    C)  Native metal    

    D)         cryolite

    Correct Answer: B

    Solution :

    [b] Because aluminum metal reacts with water and air to form powdery oxides and hydroxides, aluminium metal is never found in nature. Many common minerals, including feldspars, contain aluminum, but extracting the metal from most minerals is very energy-intensive, and therefore expensive. The main ore of aluminum is bauxite, the source of over 99% of metallic aluminum.

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