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Q.

Indium (atomic weight = 114.82) has two naturally occurring isotopes, the predominant one form has isotopic weight 114.9041 and abundance of 95.72% .Which of the following isotopic weights is the most likely for the other isotope ?

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a

772.94

b

115.90

c

113.90

d

114.90

answer is A.

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Detailed Solution

Let atomic weight of other isotopoe is M
114.82=114.9041×95.72+M×4.28100
M =112.94

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Indium (atomic weight = 114.82) has two naturally occurring isotopes, the predominant one form has isotopic weight 114.9041 and abundance of 95.72% .Which of the following isotopic weights is the most likely for the other isotope ?