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Physical Chemistry -- Atomic Structure
21.
The frequency of one of the lines in the Paschen series of a hydrogen atom is 2.34 x 10 14Hz. The quantum number n 2 which causes this transition is
- A.3
- B.4
- C.6
- D.5
- Answer
- Report
Answer : [D]
22.
The line spectra of two elements are not identical because
- A.the elements do not have the same number of neutrons
- B.they have different mass numbers
- C.their outermost electrons are at different energy levels
- D.they have different valencies
- Answer
- Report
Answer : [C]
23.
In which of the following transitions will the wavelength be minimum?
- A.n = 6 to n = 4
- B.n = 4 to n = 2
- C.n = 3 to n = 1
- D.n = 2 to n = 1
- Answer
- Report
Answer : [C]
24.
In which of the following is the radius of the first orbit minimum?
- A.A hydrogen atom
- B.A tritium atom
- C.Triply ionized beryllium
- D.Doubly ionized helium
- Answer
- Report
Answer : [C]
25.
When the electron of a hydrogen atom jumps from the n = 4 to the n = 1
state, the number of spectral lines emitted is
- A.15
- B.6
- C.3
- D.4
- Answer
- Report
Answer : [B]
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