Assertion : One atomic mass unit (amu) is mass of an atom equal to exactly one twelfth the mass of Carbon-12 atom.Reason : Carbon-12 isotope was selected as standard.
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One atomic mass unit is defined as one-twelfth of the mass of one carbon - 12 atom because C-12 is chosen as the standard atom. This is because it has the equal number of protons and neutrons (6) and constitutes most of the matter.
The most abundant isotope of carbon is Carbon - 12.
Thus both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
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Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
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