Modern atomic mass scale is based on the mass of:

H - 1

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C - 12

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C - 14

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C - 16

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Solution

The correct option is B $C - 12$
Modern atomic weight scale is based on $C - 12$ .
The standard unit for expressing the mass of atom is amu (atomic mass unit).
It is equal to 1/12 of the mass of an atom of carbon-12 equal to $1.6605 \times 10^{- 19} g$ .
amu is also called as avogram.
Avogram is a unit of mass and weight equal to one gram divided by the Avogadro's number.

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