(Paper) Atomic Structure Quiz Exercise -1 (Part-2)

Paper : Atomic Structure Quiz Exercise -1 (Part-2)

Atomic models and Planck’s quantum theory

Q.22 Bohr’s model can explain

[1] The spectrum of hydrogen atom only
[2] Spectrum of atom or ion containing one electron only
[3] The spectrum of hydrogen molecule
[4] The solar spectrum

Q.23 When an electron jumps from L to K shell

[1] Energy is absorbed
[2] Energy is released
[3] Energy is sometimes absorbed and sometimes released
[4] Energy is neither absorbed nor released

Q.24 When an electron jumps from lower to higher orbit, its energy

[1] Increases 
[2] Decreases 
[3] Remains the same 
[4] None of these

Q.25 The energy of second Bohr orbit of the hydrogen atom is – 328 kJ mol–1, hence the energy of fourth Bohr orbit would be

[1] – 41 kJ mol–1  
[2] – 1312 kJ mol–1  
[3] –164 kJ mol–1  
[4] – 82 kJ mol–1s

Q.26 If wavelength of photon is 2.2 × 10–11 m, h = 6.6 × 10–34 J-sec, then momentum of photon is

[1] 3 × 10–23 kg ms–1  
[2] 3.33 × 1022 kg ms–1  
[3] 1.452 × 10–44 kg ms–1
[4] 6.89 × 1043 kg ms–1

Q.27 If electron falls from n = 3 to n = 2, then emitted energy is

[1] 10.2 eV 
[2] 12.09 eV 
[3] 1.9 eV 
[4] 0.65 eV

Q.28 The specific charge of proton is 9.6 × 106 C kg–1 then for an α -particle it will be

[1] 38.4 × 107 C kg–1  
[2] 19.2 × 107 C kg–1  
[3] 2.4 × 107 C kg–1  
[4] 4.8 × 107 C kg–1

Q.29 Radius of the first Bohr’s orbit of hydrogen atom is

[1] 1.06 Å 
[2] 0.22 Å  
[3] 0.28 Å  
[4] 0.53 Å 

Q.30 Energy of electron of hydrogen atom in second Bohr orbit is

[1] – 5.44 × 10–19
[2] – 5.44 × 10–19 kJ 
[3] – 5.44 × 10–19 cal 
[4] – 5.44 × 10–19 eV

Q.31 The radius of first Bohr’s orbit for hydrogen is 0.53 Å. The radius of third Bohr’s orbit would be

[1] 0.79 Å 
[2] 1.59 Å 
[3] 3.18 Å 
[4] 4.77 Å

Q.32 The value of the energy for the first excited state of hydrogen atom will be

[1] –13.6 eV 
[2] – 3.40 eV 
[3] – 1.51 eV 
[4] – 0.85 eV

Q.33 Which of the following is not true in Rutherford’s nuclear model of atom

[1] Protons and neutrons are present inside nucleus
[2] Volume of nucleus is very small as compared to volume of atom
[3] The number of protons and neutrons are always equal
[4] The number of electrons and protons are always equal

Q.34 Ratio of radii of second and first Bohr orbits of H atom

[1] 2 
[2] 4 
[3] 3 
[4] 5

Q.35 The energy of the electron in the first orbit of He+ is – 871.6 × 10–20 J. The energy of the electron in the first orbit of hydrogen would be

[1] – 871.6 × 10–20
[2] – 435.8 × 10–20
[3] – 217.9 × 10–20
[4] – 108.9 × 10–20 J

Q.36 The Bohr orbit radius for the hydrogen atom (n = 1) is approximately 0.530 Å. The radius for the first excited state (n = 2) orbit is

[1] 0.13 Å 
[2] 1.06 Å 
[3] 4.77 Å 
[4] 2.12 Å

Q.37 In case of hydrogen atom when electron falls from higher level to M shell, the corresponding spectral line will form the part of

[1] Balmer series 
[2] Lyman series 
[3] Paschen series 
[4] Pfund series

Q.38 The velocity of an electron on 1, 2 and 3rd orbit of hydrogen atom is given respectively as V1, V2, V3. They maintain the order

[1] V1 > V2 > V3  
[2] V1 < V2 < V3  
[3] V1 = V2 = V3  
[4] V1 > V2 = V3

Q.39 I.P. of hydrogen atom is equal to 13.6 eV. What is the energy required for the process : He+ + energy   He+2 + e

[1] 2 × 13.6 eV 
[2] 1 × 13.6 eV 
[3] 4 × 13.6 eV 
[4] None of these

Q.40 E1, E2, E3 and E4 respectively are the energies of the first line of Lyman, Balmer, Paschen and Brackett series. The decreasing order of their energy is

[1] E1, E2, E3, E4
[2] E4, E3, E2, E1  
[3] E1, E3, E2, E4  
[4] E2, E1, E4, E3

Q.41 If x is the velocity of an electron in first Bhor’s orbit. What would be the velocity of the electron in third Bhor’s orbit ?

[1] x/9 
[2] x/3 
[3] 3x 
[4] 9x

Q.42 What should be the maximum number of lines obtained in the spectrum, if total number of energy levels are four ?

[1] 4 
[2] 6 
[3] 2 
[4] 3

Q.43 Which of the following transitions in hydrogen atom should emit a radiation of highest frequency ?

[1] n = 5 to n = 2 Balmer 
[2] n = 3 to n = 2 Balmer
[3] n = 4 to n = 2 Balmer 
[4] n = 3 to n = 1 Lymen

Q.44 Which of the following should be the correct value of the wave number of first line in Balmer Series of hydrogen atom ?

[1] 5R/36 
[2] –5R/36 
[3] R/9 
[4] –R/9

Q.45 What should be the value of wave number of the radiation produced when electron jumps from the second orbit to first orbit in hydrogen atom ?

[1] 82276 cm–1  
[2] 3200 cm–1  
[3] 52276 cm–1  
[4] 83376 cm–1

Q.46 What should be the quantum number of the highest energy state when an electron falls from the highest energy state to Lymen Series and for this transition the wave number will be = 97492.2 cm–1 ?

[1] 2 
[2] 3 
[3] 4 
[4] 5

Answer Key

Ques.

22

23

24

25

26

Ans.

2

2

1

4

1

Ques.

27

28

29

30

31

Ans.

3

4

4

1

4

Ques.

32

33

34

35

36

Ans.

2

3

2

3

4

Ques.

37

38

39

40

41

Ans.

3

1

3

1

2

Ques.

42

43

44

45

46

Ans.

2

4

1

1

2

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