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a
The amount of substance containing the same number of chemical units as the number of atoms in exactly 12 g of C12
b
The amount of substance containing Avogadro number of chemical units.
c
The unit for expressing amount of a substance.
d
All the above
answer is D.
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Detailed Solution
Mole was introduced as seventh base quantity for expressing amount of a chemical substance. It contains Avogadro number of particles.It contains the same number of chemical units as the number of atoms in exactly 12 g of C12.