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Q.

The atomic mass of Cu is 63.546. There are only two naturally occurring isotopes of copper Cu⁶³ and Cu⁶⁵. The percentage of natural abundance of Cu⁶³ is nearly

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An Intiative by Sri Chaitanya

a

30

b

10

c

50

d

73

answer is D.

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Detailed Solution

$\begin{aligned} 63 .546 = \frac{a \times 63 + (100 - a) \times 65}{100} \\ a = 72 .7 % \approx 73 % \end{aligned}$

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