(Paper) Atomic Structure Quiz Exercise -2 (Part-3)

Paper : Atomic Structure Quiz Exercise -2 (Part-3)

Q.41 Number of orbitals having paired electrons for gaseous Fe are : [RPMT 1998]

[1] 4 
[2] 11 
[3] 15 
[4] 19

Q.42 [Ar] 3d6 is the configuration of the following ion : [RPMT 1998]

[1] Fe+2 
[2] Ti+3
[3] Co
+2 
[4] Cr+3

Q.43 Which triad of quantum number [n, l, m] is not applicable for 3d-electron : [RPMT 1998]

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

Q.45 The ratio of radii of 3rd and 2nd Bohr’s orbit of hydrogen atom is : [RPMT 1998]

[1] 3 : 2 
[2] 4 : 9 
[3] 9 : 4 
[4] 9 : 1

Q.46 The four quantum number for the valence shell electron or last electron of sodium is : [MP PMT 1999]

[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.47 Heaviest particle is : [MP PET 1999]

[1] Meson 
[2] Neutron 
[3] Proton 
[4] Electron

Q.48 Which is correct statement about proton : [MP PET 1999]

[1] Proton is nucleus of deuterium 
[2] Proton is ionized hydrogen molecule
[3] Proton is ionized hydrogen atom 
[ 4] P r o t o n i s α-particle

Q.49 The energy of an electron in nth orbit of hydrogen atom is : [MP PET 1999]

[1] (– 13.6/n4)eV
[2] (– 13.6/n3)eV
[3] (– 13.6/n2)eV
[4] (– 13.6/n)eV

Q.50 If wavelength of photon is 2.2 × 10–11 m, h = 6.8 × 10–34 Js, then momentum of photon is : [MP PET 1999]

[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.51 The electrons identified by quantum number n and l [IIT 1999]

(i) n = 4, l = 1 
(ii) n = 4,
l = 0
(iii) n = 3,
l = 2 
(iv) n = 3,
l = 1

can be placed in order of increasing energy from the lowest to highest, as :

[1] (iv) < (ii) < (iii) < (i) 
[2] (ii) < (iv) < (i) < (iii)
[3] (i) < (iii) < (ii) < (iv) 
[4] (iii) < (i) < (iv) < (ii)

Q.53 Which of the following has more unpaired d-electron : [CBSE 1999]

[1] Zn+ 
[2] Fe2+
[3] Ni
3+
[4] Cu
+

Q.54 The uncertainty in momentum of an electron is 1 × 10–5 kg-m/s. The uncertainty in its position will be : [CBSE 1999]

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

Q.55 The de-Broglie wavelength of a particle with mass 1g and velocity 100 m/s is : [CBSE 1999]

[1] 6.63 × 10–33
[2] 6.63 × 10
–34
[3] 6.63 × 10
–35
[4] 6.65 × 10
–32 m

Q.56 Which of the following set of quantum numbers belong to highest energy : [CPMT 1999]

[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.57 Which of the following are isoelectronic species : [CPMT 1999]

I – CH+3II – NH2III – NH+4IV – NH3

[1] I, II, III 
[2] II, III, I
[3]
I, II, I
[4]
I and II

Q.58 Which quantum number will determine the shape of the subshell : [CPMT 1999]

[1] Principal quantum number 
[2] Azimuthal quantum number
[3] Magnetic quantum number 
[4] Spin quantum number

Q.59 A metal in its di positive state has the electronic configuration 2, 8, 14 and has the atomic weight equal to 56. Number of neutrons in its nucleus would be : [RPMT 1999]

[1] 30 
[2] 32 
[3] 34 
[4] 28

Q.60 Which set of quantum number for an electron of an atom is not possible : [RPMT 1999]

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

Answer Key

Ques.

41

42

43

44

45

Ans.

2

1

2

1

3

Ques.

46

47

48

49

50

Ans.

2

2

3

3

1

Ques.

51

52

53

54

55

Ans.

1

1

2

3

1

Ques.

56

57

58

59

60

Ans.

4

2

2

1

2

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