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Q.

An element is found in nature in two isotopic forms with mass numbers (A−1) and (A+3). If the average atomic mass of the element is found to be A, then the relative abundance of the heavier isotope in the nature will be

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a

66.6%

b

75%

c

25%

d

50%

answer is C.

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Detailed Solution

detailed_solution_thumbnail

Let relative abundance of heavier isotope be X %

A=(100−X)(A−1)+X(A+3)100

100A=100A−xA−100+x+3x+xA

4x=100

∴x=25.

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