(Paper) Atomic Structure Quiz Exercise -1 (Part-4)

Paper : Atomic Structure Quiz Exercise -1 (Part-4)

Q.65 Azimuthal quantum number for last electron of Na atom is

[1] 1
[2] 2
[3] 3
[4] 0

Q.66 Which of the following set of quantum numbers belong to highest energy

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

Q.67 Which of the following sets of quantum numbers is not allowed

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

Q.68 Which of the following has maximum energy

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

Q.69 Correct statement is

[1] K = 4s1, Cr = 3d4 4s2, Cu = 3d10 4s2  
[2] K = 4s2, Cr = 3d4 4s2, Cu = 3d10 4s2
[3] K = 4s2, Cr = 3d5 4s1, Cu = 3d10 4s2  
[4] K = 4s1, Cr = 3d5 4s1, Cu = 3d10 4s1

Q.70 The number of unpaired electrons in an O2 molecule is

[1] 0 
[2] 1 
[3] 2 
[4] 3

Q.71 The number of unpaired electrons in carbon atom in excited state is

[1] 1 
[2] 2 
[3] 3 
[4] 4

Q.72 Which of the following has the least energy

[1] 2p 
[2] 3p 
[3] 2s 
[4] 4d

Q.73 The correct order of increasing energy of atomic orbitals is

[1] 5p < 4f < 6s < 5d 
[2] 5p < 6s < 4f < 5d 
[3] 4f < 5p < 5d < 6s 
[4] 5p < 5d < 4f < 6s

Q.74 The orbital angular momentum of an electron in 2s-orbital is

[1] (1/2) h/2π
[2] h/2π
[3] (√2)h/2π
 [4] 0

Q.75 If the values of (n + l) is not > 3, then the maximum number of electrons in all the orbitals would be

[1] 12
[2] 10 
[3] 2 
[4] 6

Q.76 Given : Orbital – A Orbital – B  n = 3, l = 2 n = 5, l = 0  The order of their energies would be 
[1] B > A
[2] A > B 
[3] A = B 
[4] None of these

Q.77 Quantum numbers of 13th electron of silicon (Z = 14) are 3, 1, 1, +½. Which one of the following is true set of quantum numbers for the 14th electron ?

[1] 3, 1, 0, +½ 
[2] 3, 0, 1, +½ 
[3] 3, 1, 1, –½ 
[4] 3, 1, –1,

Q.78 Using hund’s rule to decide which of the following is not the ground state electronic configuration
[1] [He] 2s 2p
[2] [He] 2s 2p
[3] [He] 2s 2p
[4] [He] 2s 2p

Q.79 What are the chances that the electron in a hydrogen atom has a spin quantum number of +½

[1] 25% 
[2] 100% 
[3] 50% 
[4] 0%

Q.80 Which species shows the electronic configuration 1s2, 2s2 2p5, 3s2 ?

[1] Ne (Ground state)
[2] Al+2 (Ground state) 
[3] Mg+ (Excited state) 
[4] Na+ (Excited state)

Answer Key

Ques.

65

66

67

68

69

Ans.

4 4 2 2 4
Ques. 70 71 72 73 74
Ans. 3 4 3 2 4
Ques. 75 76 77 78 79
Ans. 1 1 4 4 3
Ques. 80
Ans. 3

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