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Standard XII
Chemistry
Question

All the electrons in a sample of the hydrogen atom are excited to n = 7 level. The number of emission spectral lines possible are:
  1. 12
  2. 15
  3. 18
  4. 21

A
15
B
18
C
12
D
21
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Solution
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The transition of an electron from n=7 to n=1 energy level gives a unique emission spectral line.

Therefore, the number of emission spectral lines =(n2−n1)(n2−n1+1)2.

=(7−1)(7−1+1)2

=21

Hence, option C is correct.

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