RRB Group-D Model Paper 11 with answers for online practice

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Question : 35 of 100

Marks: +1, -0

The relative atomic masses of all elements have been found with respect to an atom of ________.

N-14
O-16
C-12
C-16

Solution:

The International Union of Chemists selected the most stable carbon isotope (C-12) or $↖{12}C$ as the standard for comparison of the atomic masses of various elements.
The mass of C-12 is taken as a 12 atomic mass unit (standard).
A Carbon-12 contains six protons, six neutrons, and six electrons.

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