The relative atomic mass of boron (which exists in two isotopic forms ^ 10 B and ^ 11 B) is 10·81. What will be the abundance of ^ 10 B and ^ 11 B, respectively (consider a sample of 100 atoms) ?

NDA 2024 Chemistry question

The relative atomic mass of boron (which exists in two isotopic forms and ) is 10·81. What will be the abundance of and , respectively (consider a sample of 100 atoms) ?

(A)19% and 81%Correct
(B)81% and 19%
(C)38% and 62%
(D)62% and 38%

Answer: (A)

Solution

Let the fraction of be . Then , so

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Question ID VK-032655