An element B, has two isotopes \( ^{20}_{10}B and ^{22}_{10}B = 2:3 \) present in
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An element B, has two isotopes \( ^{20}_{10}B and ^{22}_{10}B = 2:3 \) present in ratio 2:3. The relative atomic mass of B is
- A) 20.5
- B) 21.2
- C) 23.4
- D) 25.0
Correct Answer: B) 21.2
Explanation
\( ^{20}_{10}B : ^{22}_{10}B = 2:3 \)
\( ^{20}_{10}B = \frac{2}{5} \times 100 = \) 40%
\( ^{22}_{10}B = \frac{3}{5} \times 100 = \) 60%
\( \frac{40 \times 20}{100} + \frac{60 \times 22}{100} = 21.2 \)
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