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Variable Oxidation States

The electron ...

Question

The electron present in excited state of $H e^{\oplus}$ ion shows separation on collision with an electron having 2.5 eV energy. What will be the minimum value of n for this electrons of $H e^{\oplus}$ ion ?

A

4

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B

5

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C

6

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D

3

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Solution

The correct option is B 5
$\begin{matrix} E = \frac{z^{2}}{n^{2}} 13.6 e V = 2.5 e V \Rightarrow n = \sqrt{\frac{2^{2} \times 13.6}{2.5}} = \frac{2}{5} \sqrt{136} = 0.4 \sqrt{136} n \approx 5 A n s . (B) \end{matrix}$

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