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NEET Sample Paper NEET Sample Test Paper-80

  • question_answer
    Boron exist in two allotropic forms called amorphous and crystalline forms. Amorphous boron is a brown powder of specific gravity 2.34. The crystalline boron exists in several different modification. The structure of crystalline boron is

    A)  icosahedron

    B)  tetrahedron

    C)  octahedron

    D)  pentagonal bipyramidal

    Correct Answer: A

    Solution :

    \[{{B}_{12}}\] has 12 B units


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