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  1. What is the fundamental unit of amount of a substance?

    2. A.

     Mole
    B.

     Candela
    C.

     Kelvin
    D.

     Meter

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    Answer : Option A

    Explanation :

    The mole, symbol mol, is the SI unit of amount of substance of a specified elementary entity, which may be an atom, molecule, ion, electron, any other particle or a specified group of such particles; its magnitude is set by fixing the numerical value of the Avogadro constant to be exactly 6.022 141 29 × 1023 when it is expressed in the SI unit mol–1.

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