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NEET CHEMISTRYStructure of AtomEasy

Question

Which of the following series of transitions in the spectrum of hydrogen atoms falls in the visible region?

A

Brackett series

B

Lyman series

C

Balmer series

D

Paschen series

Step-by-Step Solution

The spectral series of hydrogen are classified based on the principal quantum number of the final energy state (n1n_1) to which the electron transitions. Each series corresponds to a specific region of the electromagnetic spectrum:

  1. Lyman Series (n1=1n_1 = 1): Transitions to the first energy level fall in the Ultraviolet (UV) region.
  2. Balmer Series (n1=2n_1 = 2): Transitions to the second energy level fall in the Visible region.
  3. Paschen Series (n1=3n_1 = 3): Transitions to the third energy level fall in the Infrared (IR) region.
  4. Brackett Series (n1=4n_1 = 4): Transitions to the fourth energy level fall in the Infrared (IR) region.

Therefore, the Balmer series is the distinct series that produces lines visible to the human eye.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Structure of Atom. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYStructure of Atomfollowingseriestransitionsspectrumhydrogen

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A.211.6 pm
B.211.6 $\pi$ pm
C.52.9 $\pi$ pm
D.105.8 pm
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A.14
B.16
C.10
D.12
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If the principal quantum number n=6, the correct sequence of filling of electrons will be:

A.ns → np → (n-1)d → (n-2)f
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The measurement of the electron position is associated with an uncertainty in momentum which is equal to $1 \times 10^{-18} \text{ g cm s}^{-1}$. The uncertainty in velocity of the electron will be: (mass of an electron is $9 \times 10^{-28} \text{ g}$)

A.1 × 10⁹ cm s⁻¹
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The relation between $n_m$ ($n_m$ = number of permissible values of magnetic quantum number, $m_l$) for a given value of azimuthal quantum number ($l$) is:

A.$n_m = l + 2$
B.$l = \frac{n_m - 1}{2}$
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Which one of the following ions has electronic configuration [Ar]3d⁶? (At. no: Mn = 25, Fe = 26, Co = 27, Ni = 28)

A.Ni³⁺
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