(Paper) Atomic Structure Quiz Exercise -2 (Part-1)

Paper : Atomic Structure Quiz Exercise -2 (Part-1)

Q.1 From the given sets of quantum numbers the one that is inconsistent with the theory is : [IIT-Scr. 1994]

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

Q.2 Calculate the momentum of a particle which has a de-Broglie’s wavelength of 10–10 m (h = 6.6 × 10–34 kg m2 sec–1). [CPMT 1994]

[1] 6.6 × 10–25 kg ms–1  
[2] 6.6 × 10–23 kg ms–1  
[3] 6.6 × 10–24 kg ms–1  
[4] None of these 

Q.3 The total number of electrons present in all the p-orbitals of bromine are : [MP PET 1994]

[1] Five 
[2] Eighteen 
[3] Seventeen 
[4] Thirty five

Q.4 When an electron revolves in a stationary orbit then : [MP PET 1994]

[1] It absorbs energy 
[2] It gains kinetic energy
[3] It emits radiation 
[4] Its energy remains constant

Q.5 The total number of valence electrons in 4.2 gm of N3 ion is (NA is the Avogadro’s number) : [CBSE 1994]

[1] 1.6 NA  
[2] 3.2 NA
[3] 2.1 NA
[4] 4.2 NA

Q.6 If n = 3, then the value of ‘l’ which is incorrect : [CPMT 1994]

[1] 0 
[2] 1 
[3] 2 
[4] 3

Q.7 Chlorine atom differs from chloride ion in the number of : [MP PET 1995]

[1] Proton 
[2] Neutron 
[3] Electrons 
[4] Protons and electrons

Q.8 The uncertainty in the position of an electron (mass = 9.1 × 10–28 g) moving with a velocity of 3.0 × 104 cm s–1 accurate upto 0.001% will be (use h/4π in the uncertainty expression, where h = 6.62 × 10–27 erg-s) [CBSE 1995]

[1] 1.92 cm 
[2] 7.68 cm 
[3] 5.76 cm 
[4] 3.84 cm 

Q.9 A 3p orbital has : [IIT 1995]

[1] Two spherical nodes 
[2] Two non-spherical nodes
[3] One spherical and one non-spherical nodes 
[4] One spherical and two non-spherical nodes

Q.10 Zeeman effect refers to the : [AFMC 1995]

[1] Splitting up of the lines in an emission spectrum in a magnetic field
[2] Splitting up to the lines in an emission spectrum in the presence of an external electrostatic field
[3] Emission of electrons from metals when light falls upon them
[4] Random scattering of light by colloidal particles

Q.11 For n = 3 energy level, the number of possible orbitals are : [MP PMT 1995]

[1] 1 
[2] 3 
[3] 4 
[4] 9

Q.12 The orbital angular momentum of an electron in 2s orbital is : [IIT 1996]

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

Q.13 Which statement is not correct for n = 5, m = 3 : [CPMT 1996]

[1] l = 4 
[2] l = 0, 1, 2, 3 ; s = + 1/2
[3] l = 3 
[4] All are correct

Q.14 1s2, 2s2 2p5 3s2 shows configuration of : [CPMT 1996]

[1] Al+3 in ground state 
[2] Ne in excited state
[3] Mg+1 in excited stated 
[4] All are correct

Q.15 In a Bohr’s model of atom when an electron jumps from n = 1 to n = 3, how much energy will be emitted or absorbed : [CBSE 1996]

[1] 2.15 × 10–11 ergs 
[2] 0.1911 × 10–10 ergs 
[3] 2.389 × 10–12 ergs 
[4] 0.239 × 10–10 ergs

Q.16 The shape of an orbital is given by the quantum number : [MP PMT 1996]

[1] n 
[ 2 ]
[3] m 
[4] s

Q.17 Which of the following metal ions will have maximum number of unpaired electrons : [CPMT 1996]

[1] Fe+2
[2] Co+2  
[3] Ni+2  
[4] Mn+2

Q.18 The maximum probability of finding an electron in the dxy orbital is : [MT PET 1996]

[1] Along the x-axis 
[2] Along the y-axis
[3] At an angle of 45º from the x and y-axes 
[4] At an angle of 90º from the x and y-axes

Q.19 CO has same electrons as or the ion that is isoelectronic with CO is : [CBSE 1997]

[1] N2+  
[2] CN  
[3] O2+  
[4] O2-

Answer Key

Ques.

1

2

3

4

5

Ans.

1

3

3

4

1

Ques.

6

7

8

9

10

Ans.

4

3

1

3

1

Ques.

11

12

13

14

15

Ans.

4

2

2

3

2

Ques.

16

17

18

19

20

Ans.

2

4

3

2

4

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