s Sample papers for Railways General Science & Technology Occurence and Extraction of Metals Occurence and Extraction of Metals Sample Test Paper-18 - Studyadda.com
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Railways General Science & Technology Occurence and Extraction of Metals Sample Paper Occurence and Extraction of Metals Sample Test Paper-18

  • question_answer
    Until the nineteenth century, aluminium was almost as expensive as gold. The invention of an inexpensive way to extract this metal by a 22-year-old American made this metal inexpensive subsequently. The investor was

    A)  Goldschmidt     

    B)  Mond

    C)  Charles-Martin Hall

    D)  Parkes

    Correct Answer: C

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