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

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

Q.21 Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon : [CPMT 1997]

[1] 3s 
[2] 2p 
[3] 2s 
[4] 1s 

Q.22 An electron has principal quantum number 3. The number of its : [MT PET 1997]

(i) subshells and (ii) orbitals would be respectively

[1] 3 and 5 
[2] 3 and 7 
[3] 3 and 9 
[4] 2 and 5

Q.23 Aufbau principle is not satisfied by : [MP PMT 1997]

[1] Cr and Cl 
[2] Cu and Ag 
[3] Cr and Mg 
[4] Cu and Na

Q.24 The first use of quantum theory to explain the structure of atom was made by : [IIT 1997]

[1] Heisenberg 
[2] Bohr 
[3] Planck 
[4] Einstein

Q.26 In an element going away from nucleus, the energy of particle : [RPMT 1997]

[1] Decreases 
[2] Unchanged 
[3] Increases 
[4] None of these

Q.27 In neutral atom, which particles are equivalent : [RPMT 1997]

[1] p+, e+ 
[2] e, e+
[3] e
, p+ 
[4] p+, n0

Q.28 If n + l = 6, then total possible number of subshells would be : [RPMT 1997]

[1] 3 
[2] 4 
[3] 2 
[4] 5

Q.29 The configuration 1s2 2s2 2p5 3s1 shows : [AIIMS 1997]

[1] Ground state of fluorine atom 
[2] Excited state of fluorine atom
[3] Excited state of neon atom 
[4] Excited state of ion O
2ion

Q.30 The electron configuration of gadolinium (atomic no. 64) is : [CBSE 1997]

[1] [Xe] 4f8 5d9 6s2  
[2] [Xe] 4f7 5d1 6s2  
[3] [Xe] 4f3 5d5 6s2
[4] [Xe] 4f
6 5d2 6s2

Q.31 If electron falls from n = 3 to n = 2, then emitted energy is : [AFMC 1997]

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

Q.32 Number of protons, neutrons and electrons in the element 89X231 is : [AFMC 1997]

[1] 89, 231, 89 
[2] 89, 89, 242 
[3] 89, 142, 89 
[4] 89, 71, 89

Q.33 In the ground state configuration of Cr24 how many orbitals are present having paired and unpaired electrons: [RPMT 1997]

[1] 10 
[2] 12 
[3] 15 
[4] 16 

Q.34 Discoverer of positron : [RPMT 1997]

[1] Paulling 
[2] Anderson 
[3] Yukawa 
[4] Segre

Q.35 Which of the following species not contains neutrons : [RPMT 1997]

[1] H 
[2] Li
+2
[3] C 
[4] O

Q.36 The energy of an electron in the first Bohr orbit of H atom is – 13.6 eV. The possible energy value of the first excited state for electrons in Bohr orbits to hydrogen is (are) : [IIT 1998]

[1] – 3.4 eV 
[2] – 4.2 eV 
[3] – 6.8 eV 
[4] + 6.8 eV

Q.37 The energy of an 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 : [Roorkee 1998]

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

Q.38 The position of both an electron and a helium atom is known within 1.0 nm and the momentum of the electron is known within 50 × 10–26 kg ms–1. The minimum uncertainty in the measurement of the momentum of the helium atom is : [CBSE 1998]

[1] 50 kg ms–1  
[2] 60 kg ms
–1  
[3] 80 × 10
–26 kg ms–1  
[4] 50 × 10
–26 kg ms–1

Q.39 The Bohr orbit radius for the hydrogen atom (n = 1) is approximately 0.530 A. The radius for the first excited state (n = 2) orbit is : [CBSE 1998]

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

Q.40 Which of the following explain the sequence of filling the electrons in different orbitals : [AIIMS 1998]

[1] Hund’s rule 
[2] Octet rule 
[3] Aufbau principle 
[4] All of these

Answer Key

Ques.

21

22

23

24

25

Ans.

4

3

2

2

4

Ques.

26

27

28

29

30

Ans.

3

3

1

3

2

Ques.

31

32

33

34

35

Ans.

3

3

3

2

1

Ques.

36

37

38

39

40

Ans.

1

3

4

4

3

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