(Paper) Atomic Structure Quiz Exercise -1 (Part-3)

Paper : Atomic Structure Quiz Exercise -1 (Part-3)

Dual nature of electron, Uncertainty principle and Schrodinger wave equation

Q.47  What is the de-broglie wavelength associated with the hydrogen electron in its third orbit

[1] 9.96 × 10–10 cm 
[2] 9.96 × 10–8 cm 
[3] 9.96 × 104 cm 
[4] 9.96 × 108 cm

Q.48 Which one is not the correct relation in the following

[ 1 ] h = E / υ 
[2] E = mc2  
[3] ∆x ×∆p = h/4π 
[4] λ = h/mυ

Q.49 The uncertainty in momentum of an electron is 1 × 10–5 kg – m/s. The uncertainty in its position will be (h = 6.62 × 10–34 kg –m2/s)

[1] 1.05 × 10–28
[2] 1.05 × 10–26
[3] 5.27 × 10–30
[4] 5.25 × 10–28 m

Q.50 The uncertainty in the position of a moving bullet of mass 10 gm is 10–5 m. Calculate the uncertainty in its velocity

[1] 5.2 × 10–28 m/sec 
[2] 3.0 × 10–28 m/sec 
[3] 5.2 × 10–22 m/sec 
[4] 3 × 10–22 m/sec

Q.51 The ratio of energy of photons having wavelength 2000 Å and 4000Å respectively would be

[1] 1/4 
[2] 4 
[3] 1/2 
[4] 2

Q.52 Helium atom is twice as heavy as hydrogen molecule. At 298 K the average kinetic energy of helium atom would be

[1] Equal to that of hydrogen molecule 
[2] Four times that of hydrogen molecule
[3] Twice that of hydrogen molecule 
[4] Thrice that of hydrogen molecule

Q.53 K.E. of the electron is 4.55 × 10–25 J. Its de Broglie wave length is

[1] 4700 Å 
[2] 8300 Å 
[3] 7200 Å 
[4] 7400 Å

Quantum Number, Electronic Configuration and Shape of Orbitals

Q.54 Nitrogen has the electronic configuration 1s2, 2s2 2px1 2py1 2pz1 and not 1s2, 2s2 2px2 2py1 2pz0  which is determined by

[1] Aufbau’s principle 
[2] Pauli’s exclusion principle 
[3] Hund’s rule  
 [4] uncertainty principle

Q.55 2p orbitals have

[1] n = 1, l = 2 
[2] n = 1, l = 0 
[3] n = 2, l = 1 
[4] n = 2, l = 0

Q.56 An element has the electronic configuration 1s2, 2s2 2p6, 3s2 3p2. Its valency electrons are

[1] 6 
[2] 2 
[3] 3 
[4] 4

Q.57 Which of the following sets of quantum numbers represent an impossible arrangement         

                   n             l            m          ms                                
       [1]       3             2             –2           (+)1/2  
      
       [2]      4              0              0            (-)1/2        
       [3]      3             2             –3            (+)1/2                                   
       [4]      5             3              0             (-)1/2

Q.58 The electronic configuration of calcium ion (Ca2+) is

[1] 1s2, 2s2 2p6, 3s2 3p6, 4s2  
[2] 1s2, 2s2 2p6, 3s2 3p6, 4s1
[3] 1s2, 2s2 2p6, 3s2 3p6 3d2  
[4] 1s2, 2s2 2p6, 3s2 3p6, 4s0

Q.69 The structure of external most shell of inert gases is

[1] s2 p3  
[2] s2p6  
[3] s1p2  
[4] d10s2

Q.60 The number of orbitals in the fourth principal quantum number will be

[1] 4 
[2] 8 
[3] 12 
[4] 16

Q.61 Which set of quantum numbers are not possible from the following

[1] n = 3, l = 2, m = 0, s = -1/2
[2] n = 3, l = 2, m = –2, s = -1/2
[3] n = 3, l = 3, m = –3, s = -1/2
[4] n = 3, l = 0, m = 0, s = -1/2

Q.62 The four quantum number for the valence shell electron or last electron of sodium (Z = 11) is

[1] n = 2, l = 1, m = –1, s = -1/2 
[2] n = 3, l = 0, m = 0, s = +1/2
[3] n = 3, l = 2, m = –2, s = -1/2
[4] n = 3, l = 2, m = 2, s = +1/2

Q.63 In a potassium atom, electronic energy levels are in the following order

[1] 4s > 3d 
[2] 4s > 4p 
[3] 4s < 3d 
[4] 4s < 3p

Q.64 How many electrons can be accommodated in a sub-shell for which n = 3, l = 1

[1] 8 
[2] 6 
[3] 18 
[4] 32

Answer Key

Ques.

47

48

49

50

51

Ans.

2

3

3

1

4

Ques.

52

53

54

55

56

Ans.

2

3

3

3

4

Ques.

57

58

59

60

61

Ans.

3

4

2

4

3

Ques.

62

63

64

Ans.

2

3

2

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