Atomic mass unit is defined as-

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1/12^ththe mass of Carbon atom

1/16^th the mass of Oxygen atom

1/16^th the mass of Argon atom

1/40^th the mass of Nitrogen atom

answer is B.

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Detailed Solution

AMU is defined as one-twelfth the mass of an atom of carbon-12 (12-C). 12-C is the most abundant natural carbon isotope, accounting for over 98% of carbon found in nature. It has an AMU of 12.

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