Structure of Atom | Atomic Structure: MCQs | Question – Paper 7


Topic: Structure of Atom, Test No.: 07, Total MCQs: 10

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Question 1
Based on equation E = –2.178 × 10–18 Jcertain conclusions are written. Which of them is not correct? [NEET 2013]
A
Larger the value of n, the larger is the orbit radius
B
Equation can be used to calculate the change in energy when the electron changes orbit
C
For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit
D
The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus
Question 2
The electrons, identified by quantum numbers n and l
(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:
A
(iv) < (ii) < (iii) < (i)
B
(ii) < (iv) < (i) < (iii)
C
(i) < (iii) < (ii) < (iv)
D
(iii) < (i) < (iv) < (ii)
Question 3
The atomic number of elements X, Y and Z are 19, 21 and 25 respectively. The number of electrons present in the 'M' shell of these elements follows the order
A
Z > X > Y
B
X > Y > Z
C
Z > Y > X
D
Y > Z > X
Question 4
The de-Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 meters per second is approximately
A
10–33 m
B
10–31 m
C
10–16 m
D
10–25 m
Question 5
The electronic configuration of an element is 1s2 2s2 2p6 3s2 3p6 3d5 4s1. This presentation is
A
excited state
B
ground state
C
cationic form
D
anionic form
Question 6
The electronic configuration of Cr3+ is
A
[Ar]3d54s1
B
[Ar]3d24s1
C
[Ar]3d34s0
D
[Ar]3d44s2
Question 7

The energy of a photon is 3 ´ 10–12 ergs. What is its wavelength in nm?

(h = 6.62 × 10–27 ergs, c = 3 ´ 1010 cm/s)

A
662
B
1324
C
66.2
D
6.62
Question 8
The calculated magnetic moment (in Bohr magneton) of Cu2+ ion is
A
1.73
B
0
C
2.6
D
3.4
Question 9
The atomic number of an element ‘M’ is 26. How many electrons are present in the M-shell of the element in its M3+ state?
A
11
B
15
C
14
D
13
Question 10
The atomic number of an element is 35. What is the total number of electrons present in all the P-orbitals of the ground state atom of the element
A
6
B
11
C
17
D
23
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