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A hydrogen atom makes a transition from ...

A hydrogen atom makes a transition from `n=2` to `n=1` and emits a photon. This photon strikes a doubly ionized lithium atom `(Z=3)` in excited state and completely removes the orbiting electron. The least quantum number for the excited stated of the ion for the process is:

A

2

B

5

C

3

D

4

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The correct Answer is:
d
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