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Atoms and Molecules — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
MCQ
Which of the following is not a molecule?
    • A
      O
    • B
      O2​
    • C
      CO2​
    • D
      N2​
    ✓

    Answer

    1. O

    Explanation:

    A molecule may be homonuclear, that is, it consists of atoms of a single chemical element, as with oxygen (O2​ or N2​), or, it may be heteronuclear, a chemical compound composed of more than one element, as with water (H2​O or CO2​).

    Out of all the options, O  represents a single oxygen atom and not a molecule.

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