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    The p-Block Elements

    Multiple Choice QuestionsShort Answer Type

    11.

    What is the structure of BO subscript 3 superscript minus ion?

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    Answer
    12.

    Name a hydride of boron which is used as reducing agent in organic chemistry. 

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    Answer
    13.

    Does a molecule of BH3 exist?

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    Answer
    14.

    What is relative stability of +1 oxidation state in group 13.

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    15.

    Are all the B-H bonds in diborane equivalent?

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    Answer
    16.

    What is tincal ?

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    Answer
    17.

    What is tau or banana bond?

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    Answer
    18.

    Name two elements used as semiconductors in electronic devices.

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    19.

    Why does boron not form B+3?

    boron does not form B+3 because of its small size and the high sum of first three ionisation energies it does not lose its three valence electrons to form B+3 ions.

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    20.

    Arrange BCl3, BBr3 and BF3 in the decreasing order of Lewis acid character.

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