(Paper) Atomic Structure Quiz Exercise -2 (Part-4)

Paper : Atomic Structure Quiz Exercise -2 (Part-4)

Q.61 Outer electronic configuration of the element of atomic number 24 is : [RPMT 1999]

[1] 3s2 3p6 3d5 4s1  
[2] 3s2 3p6 3d4 4s2
[3] 3s
2 3p6 3d6
[4] None

Q.62 The basis of three unpaired electrons in the configuration of nitrogen is : [RPMT 1999]

[1] Aufbau principle 
[2] Pauli’s principle 
[3] Hund’s principle 
[4] Uncertainty principle

Q.63 Correct order of size is : [RPMT 1999]

[1] I > I+ > I  
[2]
I > I > I+  
[3] I > I > I+
[4]
I+ > I > I

Q.64 Which is not electromagnetic radiation : [RPMT 2000]

[1] Infrared rays 
[2] X–ray 
[3] Cathode rays 
[4] Gamma rays

Q.65 Which of the following pair of orbitals posses two nodal planes : [RPMT 2000]

[1] pxy, dx2-y2  
[2] d
xy, dzx  
[3] pyz, dzx
[4] dz2 , dx2-y2

Q.66 The mass of a neutron is of the order of : [RPMT 2000]

[1] 10–23 kg 
[2] 10
–24 kg 
[3] 10
–26 kg 
[4] 10
–27 kg

Q.67 Smallest cation is : [RPMT 2000]

[1] Na+
[2] Mg
2+  
[3] Ca2+
[4] Al
3+

Q.68 Electron enters the sub-shell for which (n + l) value is minimum. This is enunciated as : [RPMT 2000]

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

Q.69 The minimum real charge on any particle which can exist is : [RPMT 2000]

[1] 1.6 × 10–19 coulomb 
[2] 1.6 × 10
–10 coulomb
[3] 4.8 × 10
–10 coulomb 
[4] Zero

Q.70 Which sub-shell is not permissible : [RPMT 2000]

[1] 2d 
[2] 4f 
[3] 6p 
[4] 3s

Q.71 Sub-shell designated by azimuthal quantum number l = 3 can have maximum number of electrons : [RPMT 2000]

[1] 14 
[2] 6 
[3] 10 
[4] 0 

Q.72 Quantum number n = 3, l = 2, m = + 2 shows how many orbitals : [CPMT 2001]

[1] 1 
[2] 2 
[3] 3 
[4] 4

Q.73 Which is isoelectronic with sulphide ion : [RPMT 2001]

[1] Cl 
[2] Ne 
[3] Ar 
[4] Kr

Q.74 Ground state electronic configuration of nitrogen is : [RPMT 2001]

[1] 1s2, 2s2, 2px1, 2py1, 2pz1
[2] 1s
2, 2s2, 2px2, 2py1
[3] 1s
2, 2s2, 2px2, 2pz1
[4] 1s
2, 2s2, 2px3

Q.75 In the Bohr’s orbit, what is the ratio of total kinetic energy and total energy of electron : [RPMT 2002]

[1] – 1 
[2] – 2 
[3] 1 
[4] + 2

Q.76 Rutherford α-particle dispersion experiment concludes : [RPMT 2002]

[1] All positive ions are deposited at small part 
[2] All negative ions are deposited at small part
[3] Protons moves around the electrons 
[4] Neutrons are charged particles

Q.77 Which of the following element outermost orbit’s last electron has magnetic quantum number m = 0 ? [RPMT 2002]

[1] Na 
[2] O 
[3] Cl 
[4] N 

Q.78 The value of Planck’s constant is 6.63 × 10–34 Js. The velocity of light is 3.0 × 108 m s–1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 × 1015 s–1 ? [CPMT 2003]

[1] 5 × 10–18  
[2] 4 × 101  
[3] 3 × 107  
[4] 2 × 10–25

Q.79 The orbital angular momentum for an electron revolving in an orbit is given by l(l+1).(h/2π).  This momentum for an s-electron will be given by : [AIEEE 2003]

[1] √2.(h/2π)
[2] +1/2.(h/2π)
[3] zero
[4] h/2π

Q.80 The number of d-electrons retained in Fe2+ (At. no. of Fe = 26) ion is : [AIEEE 2003]

[1] 6 
[2] 3 
[3] 4 
[4] 5

Q.81 The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately : [AIEEE 2003]

[1] 10–25 metres 
[2] 10
–33 metres 
[3] 10
–31 metres 
[4] 10
–16 metres

Q.82 In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen ? [AIEEE 2003]

[1] 2 ®
[2] 3
®
[3] 5
®
[4] 4
® 1

Q.83 Which of the following sets of quantum number is correct for an electron in 4f orbital ? [AIEEE 2004]

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

Q.84 consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively : [AIEEE 2004]

[1] 16 and 5 
[2] 12 and 5 
[3] 16 and 4 
[4] 12 and 4

Q.85 The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097 × 107 m–1) : [AIEEE 2004]

[1] 9.1 × 10–8 nm 
[2] 192 nm 
[3] 406 nm 
[4] 91 nm

Q.86 Which one of the following sets of ions represents the collection of isoelectronic species ? [AIEEE 2004]

[1] Na+, Mg2+, Al3+, Cl  
[2] Na
+, Ca2+, Sc3+, F  
[3] K+, Cl, Mg2+, Sc3+  
[4] K+, Ca2+, Sc3+, Cl

Q.87 Consider the following nuclear relations : [AIEEE 2004]

92M238 → yNx + 22He4                        yNx → BL+ 2β+

The number of neutrons in the element L is :

[1] 146 
[2] 144 
[3] 140 
[4] 142

Q.88 Which of the following have same radius as hydrogen n = 1 : [IIT Scr. 2004]

[1] He+, n = 2 
[2] Be
+3, n = 2 
[3] Li
+2, n =2 
[4] Li
+2, n = 3

Q.89 In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields ? [AIEEE 2005]

(A) n = 1, l = 0, m = 0   (B) n = 2, l = 0, m = 0  (C) n = 2, l = 1, m = 1  (D) n = 3, l = 2, m = 1  (E) n = 3, l = 2, m = 0

[1] (D) and (E) 
[2] (C) and (D) 
[3] (B) and (C) 
[4] (A) and (B)

Q.90 Which of the following statements in relation to the hydrogen atom is correct ? [AIEEE 2005]

[1] 3s, 3p and 3d orbitals all have the same energy
[2] 3s and 3p orbitals are of lower energy than 3d orbitals
[3] 3p orbital is lower in energy than 3d orbital
[4] 3s orbitals is lower in energy than 3p orbital

Q.91 Which of the following factors may be regarded as the main cause of lanthanide contraction ? [AIEEE 2005]

[1] Greater shielding of 5d electron by 4f electrons
[2] Poorer shielding of 5d electron by 4f electrons
[3] Effective shielding of one of 4f electrons by another in the subshell
[4] Poor shielding of one of 4f electron by another in the subshell

Q.92 Which of the following molecules/ions does not contain unpaired electrons ? [AIEEE 2006]

[1] B2
[2] N
2+ 
[3] O2
[4] O
22–

Q.93 According to Bohr's theory, the angular momentum of an electron in 5th orbit is [AIEEE 2006]

[1] 1.0 h/Õ
[2] 10 h/
Õ 
[3] 2.5 h/Õ
[4] 25 h/
Õ

Q.94 Uncertainty in the position of an electron (mass = 9.1 × 10–31 Kg) moving with a velocity 300 ms–1, accurate upto 0.001%, will be (h = 6.63 × 10–34 Js) [AIEEE 2006]

[1] 5.76 × 10–2
[2] 1.92 × 10
–2
[3] 3.84 × 10
–2
[4] 19.2 × 10
–2 m

Q.95 Which one of the following sets of ions represents a collection of isoelectronic species ? [AIEEE 2006]

[1] Ba2+, Sr2+, K+, Ca2+
[2] N
3–, O2–, F, S2–  
[3] Li+, Na+, Mg2+, Ca2+
[4] K
+, Cl, Ca2+, Sc3+

Q.96 Lanthanoid contraction is caused due to [AIEEE 2006]

[1] the appreciable shielding on outer electrons by 5d electrons from the nuclear charge
[2] the same effective nuclear charge from Ce to Lu
[3] the imperfect shielding on outer electrons by 4f electrons from the nuclear charge
[4] the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

Answer Key

Ques.

61

62

63

64

65

Ans.

1

3

3

3

2

Ques.

66

67

68

69

70

Ans.

4

4

2

1

1

Ques.

71

72

73

74

75

Ans.

1

1

3

1

1

Ques.

76

77

78

79

80

Ans.

1

1

2

3

1

Ques.

81

82

83

84

85

Ans.

2

3

3

2

4

Ques.

86

87

88

89

90

Ans.

4

2

2

1

1

Ques.

91

92

93

94

95

Ans.

4

4

3

2

4

Ques.

96

Ans.

3

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