Q.

An element is found in nature in two isotopic forms with mass numbers (A1) 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

75%

b

25%

c

66.6%

d

50%

answer is C.

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Detailed Solution

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Let relative abundance of heavier isotope be X %

A=(100X)(A1)+X(A+3)100

100A=100AxA100+x+3x+xA

4x=100

x=25.

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