For H-atom some spectral lines are observed as shown ( n 1 to n 6 are successive shells). The spectral line 'e' belongs to visible region and shell n 1 is the ground state. (i) There c

Question

For H-atom some spectral lines are observed as shown ( $n_{1}$ to $n_{6}$ are successive shells). The spectral line 'e' belongs to visible region and shell $n_{1}$ is the ground state.

(i) There cannot be any line in UV region.
(ii) Lines b and d belong to infrared region.
(iii) Line having shortest wavelength is a.
(iv) Line having least energy is c.
Number of correct statement(s) for the above transitions are :

TestHub · Accepted Answer

Line e (n3 to n2) is Balmer, hence visible.
(i) Correct: no transition ends at n1, so no Lyman (UV) line exists.
(ii) Correct: b (n4 to n3) and d (n5 to n3) are Paschen lines, i.e. infrared.
(iii) Correct: a (n6 to n2) spans the largest energy gap, hence shortest wavelength.
(iv) Correct: c (n6 to n5) spans the smallest gap, hence least energy. All four are correct.
Answer (D).

Chemistry - Atomic Structure Question with Solution | TestHub

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