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NEET Chemistry · Atomic Structure

Electromagnetic radiation and the hydrogen spectrum

Taught in NCERT Class 11 Chemistry, Chapter 2: Structure of Atom.

2 verified questions: Easy 0 · Medium 2 · NEET level 0

Sample questions

Sample 1Medium

An energy-level diagram of the hydrogen atom shows horizontal lines for n = 1 to n = 6, the gaps narrowing upwards. Four downward arrows are drawn: A from n = 2 to n = 1, B from n = 4 to n = 2, C from n = 5 to n = 3 and D from n = 6 to n = 4. Which arrow gives a line in the visible region of the spectrum?

  1. A

    B, a line of the Balmer series

  2. B

    A, a line of the Lyman series

  3. C

    C, a line of the Paschen series

  4. D

    D, a line of the Brackett series

Show the answer
The answer is A.

Lines of the hydrogen spectrum are grouped by the lower level: n = 1 Lyman (ultraviolet), n = 2 Balmer (visible), n = 3 Paschen and n = 4 Brackett (infrared). Arrow B ends at n = 2, so it is a Balmer line in the visible region.

  • B.

    Transitions ending at n = 1 form the Lyman series, which lies in the ultraviolet.

  • C.

    Transitions ending at n = 3 form the Paschen series, which lies in the infrared.

  • D.

    Transitions ending at n = 4 form the Brackett series, which lies in the infrared.

NCERT: Class 11 Chemistry, Chapter 2

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