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SSC CGL 2022 PYQ — Question 38

SSC CGL - 18 April 2022 - Shift 3 • General Awareness • Q38

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What is the atomic mass of oxygen (expressed in ‘u’)?

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Correct answer: C

Explanation

The correct answer is option 3 i.e. 16.

  • The relative atomic mass of oxygen is 16.
  • The atomic mass of an element is defined as the average of the isotopic masses, weighted according to the naturally occurring abundances of the isotopes of the element. 
  • The mass of one atom of oxygen-16 is 1.33291 times the mass of one carbon-12 atom, the mass of one oxygen-16 atom should be equal to 1.33291 x 12 = 15.99492 atomic mass units.