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SSC Ecology And Environment Sample Paper NCERT Sample Paper-4

  • question_answer
    Which among the following metallic mineral is used both for nuclear reactors as well as stainless steel?

    A)  Niobium          

    B)  Vanadium

    C)  Thorium          

    D)  Radium

    Correct Answer: A

    Solution :

    [a] Niobium, formerly columbium, is a chemical element with symbol Nb (formerly Cb) and atomic number 41 is a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite. Niobium has physical and chemical properties similar to those of the element tantalum, and the two are therefore difficult to distinguish.


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