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A gaseous mixture contains hydrogen atom...

A gaseous mixture contains hydrogen atoms in the `4^(th)` excited state, `He^(+)` ions in `3^(rd)` excited state and `Li^(2+)` in `2^(nd)` excited state. The number of spectral lines obtained in the emission spectrum of this sample when all these atoms/ions return to the ground state is

A

19

B

20

C

16

D

18

Text Solution

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The correct Answer is:
D
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AAKASH SERIES-ATOMIC STRUCTURE-Level - I (MAIN) (Exercise - VI (Miscellaneous))
  1. (A) Schrodinger wave equation (B) Heisenberg uncertainty principle ...

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  2. A gaseous mixture contains hydrogen atoms in the 4^(th) excited state,...

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  3. When photons of energy 4.25 eV strike the surface of a metal A, the ej...

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  4. Let A(n) be the area enclosed by n^(th) orbit in the H-atoms. The grap...

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  5. Which of the following is incorrect for d-subshell (or) orbital

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  6. Maximum probability of finding an electron along xy orbital is

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  7. Which of the following relationship is correct ?

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  8. How many electrons in atom can have n =4, =2, m=-2 and s = +(1)/(2) ?

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  9. The quantum numbers of four electrons (e(1) " to " e(4)) are given bel...

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  10. A metal surface having v(0) as threshold frequency is incident by ligh...

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  11. Which statement are correct ?

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  12. The work function (phi) of some metals is listed below. The number of ...

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  13. The orbital angular momentum of 3p electrons is :

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  14. H-atoms in ground state (13.6 eV) are excited by monochromatic radiati...

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  15. Balmer series spectral lines are observed in visible region, in the sp...

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  16. The potential energy of an electron in the hydrogen atom is -6.8 eV. I...

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  17. Which of the following rules could explains the presence of three unpa...

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  18. Number of waves produced by an electron in one complete revolution in ...

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  19. The mass of a particle is 10^(10)g and its radius is 2 xx 10^(-4)cm. I...

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  20. What is the shortest wavelength line in the Paschen series of Li^(2+) ...

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