Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceChemistrySome Basic Concepts of Chemistry1 Mark
MCQ
Modern atomic mass scale is based on the mass of :
A
$H −1$
✓
$C −12$
C
$C −14$
D
$C −16$
✓
Answer
Correct option: 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 $\frac{1}{12}$ 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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