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Q.

Statement-I :  12C has atomic mass of exactly 12 atomic mass unit (amu).

Statement-II : One amu is defined as a mass exactly equal to 1/12 of the mass of one carbon-12 atom. 

Select the correct option : 

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a

Only statement-II is correct.

b

Statement-I and II both are incorrect.

c

Only statement-I is correct.

d

Both the Statement-I and II are correct.

answer is C.

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Detailed Solution

  • One atomic mass unit is defined as one-twelfth of the mass of one carbon - 12 atom because C-12 is chosen as the standard atom. This is because it has the equal number of protons and neutrons (6) and constitutes most of the matter.
     
  • The most abundant isotope of carbon is Carbon - 12.
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Statement-I :  12C has atomic mass of exactly 12 atomic mass unit (amu).Statement-II : One amu is defined as a mass exactly equal to 1/12 of the mass of one carbon-12 atom. Select the correct option :