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Question

The modern atomic mass unit is based on the mass of :


A
C-12 isotope
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B
hydrogen
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C
oxygen
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D
nitrogen
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Solution

The correct option is A C-12 isotope
One a.m.u. or one 'u' is equal to $$1.66053892  10^{-24}\ g $$  or $$1.66053892  10^{-27}\ kg$$. It is equal to $$\dfrac{1}{12}$$ of the mass of an atom of carbon-12.
It is used as a standard. The masses of all other atoms are determined relative to the mass of an atom of carbon-12.

Chemistry

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