JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

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Number of spectral lines falling in Balmer series when electrons are de-excited from

n^{\text {th }}

shell will be given as

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Correct option: B

(n-2)

in visible region

Option B is correct. When electrons de-excite from the

n^{th}

shell to the second shell (

n_f = 2

), the spectral lines fall in the visible region (Balmer series), and the number of lines is (n-2).

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n^{\text {th }}

\mathrm{A}

\times 10^{12}

\frac{1}{{ }^{\prime} \mathrm{B}^{\prime}}

\ell = 1,\,\,m = 0

1.25 \times {10^{ - 13}} \times {A^{1/3}}\mathrm{cm}.