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The mole is the amount of substance containing the same number of chemical units as there are atoms in exactly 12 g of $^{12} C .$

Avogadro’s number is the number of units in a mole.

The weight of one gram-atom of an element means its atomic weight in g

One g-atom of each element contains the same number of atoms

answer is A, B, C, D.

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Detailed Solution

$\Rightarrow Both have N_{A} particle , \Rightarrow N_{A} particle means 1 mole, \Rightarrow 1 gram atom = Atomic wt in gram = 1 mole, \Rightarrow {1 gram atom N}_{A} atom.$

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