Test: Quantum Mechanical Model of Atom - 2 - NEET MCQ

# Test: Quantum Mechanical Model of Atom - 2 - NEET MCQ

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Test: Quantum Mechanical Model of Atom - 2 - Question 1

### The probability of finding out an electron at a point within an atom is proportional to the

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 1

ψ2 is known as probability density and is always positive. From the value of ψat different points with in an atom it is possible to predict the region around the nucleus where electron will most probably be found.

Test: Quantum Mechanical Model of Atom - 2 - Question 2

### Two electrons present in M shell will differ in

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 2

For electrons present in M shell the value of other quantum numbers are same. But, the value of spin quantum number will be different.

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Test: Quantum Mechanical Model of Atom - 2 - Question 3

### What is the lowest value of n that allows g orbital to exist?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 3

For g orbital, value of l is 4.
(0 = s, 1 = p , 2 = d, 3 = f, 4 = g)
Since l = n - 1, n should be 5.

Test: Quantum Mechanical Model of Atom - 2 - Question 4

How many subshells and electrons are associated with n = 4?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 4

For nth orbital possible values of azimuthal quantum number (subshell), l are from 0 to (n-1). Total of 'n' values.

In n=4, l=0,1,2,3 thus there are 4 subshells i.e.s,p,d,f respectively.

Magnetic quantum number ml have values from -l to +l and total of 2l+1 values.

For n=4, possible values of l and ml are:

ml=0 for l=0; total ml values =1

ml=−1,0,1 for l=1; total ml values =3

ml=−2,−1,0,1,2 for l=2; total ml values =5

ml=−3,−2,−1,0,1,2,3 for l=3; total ml values =7

Total number of orbitals = total values of ml

for n=4,

∴1+3+5+7=16 orbitals

Each orbital can occupy maximum of two electron

Number of electrons =2×16=32

Therefore in n=4, number of subshells=4, orbitals=16 and number of electrons =32.

Test: Quantum Mechanical Model of Atom - 2 - Question 5

An electron is in one of the 3d-orbitals. What are the possible values of n, l and m for this electron?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 5

For 3d, n = 3, l = 2, ml = - 2, -1, 0, +1, +2

Test: Quantum Mechanical Model of Atom - 2 - Question 6

What are the possible values of n, l and ml for an atomic orbital 4f?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 6

For 4f;  n = 4, l = 3,
ml = 7 or -3 , -2, -1 , 0 , +1, +2, +3

Test: Quantum Mechanical Model of Atom - 2 - Question 7

Describe the orbital with following quantum numbers:
(i) n = 3, l = 2
(ii) n = 4 , l = 3

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 7

(i) n = 3, l = 2 ⇒ 3 d
(ii) n = 4 , l = 3 ⇒ 4f

Quantum Numbers Description

i) n = 3, l = 2

- For the quantum numbers n = 3 and l = 2, the orbital is in the 3d subshell.
- The 3d orbital has a complex shape with two angular nodes and can hold a maximum of 10 electrons.
- Electrons in the 3d orbital have higher energy compared to those in the s and p orbitals.

ii) n = 4, l = 3

- For the quantum numbers n = 4 and l = 3, the orbital is in the 4f subshell.
- The 4f orbital has a more complex and intricate shape compared to lower energy orbitals.
- The 4f orbital can hold a maximum of 14 electrons and is located further from the nucleus due to higher energy levels.

Test: Quantum Mechanical Model of Atom - 2 - Question 8

How many electrons in an atom have the following quantum numbers?
n = 4,  s = -1/2

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 8

n = 4
l = 0, 1 , 2 , 3
ml = 0, (-1, 0, +1), (-2, -1, 0, +1, +2), (-3, -2, -1, 0, +1, +2, +3)

Total number of electrons with ms = - 1/2 will be 16.

Test: Quantum Mechanical Model of Atom - 2 - Question 9

In how many elements the last electron will have the following set of quantum numbers, n = 3 and l = 1?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 9

n = 3, l = 1 represents 3p orbital. Since p has three orientations px, py and 6 electrons will show same quantum number values of n and l.

Test: Quantum Mechanical Model of Atom - 2 - Question 10

An orbital is described with the help of a wave function. Since many wave functions are possible for an electron, there are many atomic orbitals. When atom is placed in a magnetic field the possible number of orientations for an orbital of azimuthal quantum number 3 is:

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 10

When l = 3, magnetic quantum number has 7 values ml = (2l + 1). These values are represented as -3, -2, -1, 0, +1, +2, +3

Test: Quantum Mechanical Model of Atom - 2 - Question 11

What will be the orbital angular momentum of an electron in 2s-orbital?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 11

For 2s-orbital, n = 2,1 = 0

Test: Quantum Mechanical Model of Atom - 2 - Question 12

Two values of spin quantum numbers i.e., +1/2 and -1/2 represent

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 12

Spin angular momentum of the electron, a vector quantity can have two orientations relative to the chosen axis. These two orientations take the values of +1/2 or -1/2 and are called two spin states of the electrons.

Test: Quantum Mechanical Model of Atom - 2 - Question 13

The 3d-orbitals having electron density in all the three axes is

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 13

dz2 has electron density in all three axes.

Test: Quantum Mechanical Model of Atom - 2 - Question 14

The number of radial nodes and angular nodes for d-orbital can be represented as

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 14

Total number of nodes = n - 1
For d-orbital, radial nodes = n - 3 and there are 2 angular nodes.

Test: Quantum Mechanical Model of Atom - 2 - Question 15

Few statements are given regarding nodes in the orbitals. Mark the statement which is not correct.

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 15

ns orbital has (n - 1) nodes.

Test: Quantum Mechanical Model of Atom - 2 - Question 16

Which of the following is not a correct statement regarding the energies of orbitals?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 16

If two orbitals have same value for (n + l), the orbital with lower value of n will have lower energy.

Test: Quantum Mechanical Model of Atom - 2 - Question 17

Few electrons have following quantum numbers,
(i) n = 4, l = 1
(ii) n = 4, l = 0
(iii) n = 3, l = 2
(iv) n = 3, l = 1
Arrange them in the order of increasing energy from lowest to highest.

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 17

(i) 4p, (ii) 4s, (iii) 3d, (iv) 3p
The order of increasing energy
(iv) < (ii) < (iii) < (i)

Test: Quantum Mechanical Model of Atom - 2 - Question 18

An electron can enter into the orbital when

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 18

The electron will enter in to an orbital with minimum value of n + l.

Test: Quantum Mechanical Model of Atom - 2 - Question 19

How many orbitals in total are associated with 4th energy level?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 19

n = 4, l = 0,1, 2, 3

Total number of orbitals 1s + 3p + 5d + 7f = 16

Test: Quantum Mechanical Model of Atom - 2 - Question 20

The orbital diagram in which the Aufbau principle is violated is

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 20

The Aufbau principle states that in the ground state of an atom, an electron enters the orbitals of lowest energy first and subsequent electrons are filled in the order of increasing energies. In the given orbital diagram, option (c) violates the Aufbau principle as electrons switch to p orbitals without completely filling the s orbital which has comparatively low energy.

Test: Quantum Mechanical Model of Atom - 2 - Question 21

Which of the sequences given below shows the correct increasing order of energy?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 21

3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p is the correct order of orbitals with increasing energy.

Test: Quantum Mechanical Model of Atom - 2 - Question 22

What is the electronic configuration of O2- ion?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 22

O2- ion contains 2 electrons more than O. Hence its electronic configuration will be 1s2 2s2 2p6.

Test: Quantum Mechanical Model of Atom - 2 - Question 23

Which atom (X) is indicated by the following configuration?
X → [Ne] 3s2 3p3

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 23

Phosphorus has atomic number 15.
Electronic configuration: 1s2 2s2 2p6 3s2 3p3 or [Ne] 3s2 3p3

Test: Quantum Mechanical Model of Atom - 2 - Question 24

Which of the following configurations represents the most electronegative element?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 24

Z = 9 is the atomic number of fluorine which is the most electronegative element.

Test: Quantum Mechanical Model of Atom - 2 - Question 25

Which of the following configurations represents a noble gas?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 25

The outermost shell configuration of the element shows 8 electrons hence it is a noble gas.

Test: Quantum Mechanical Model of Atom - 2 - Question 26

An element has 13 electrons in its M shell and 1 electron in N shell in ground state. Identify the element.

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 26

M orbital with 13 electrons and N orbital with 1 electron correspond to chromium.

Test: Quantum Mechanical Model of Atom - 2 - Question 27

The configuration of the valence orbital of an element with atomic number 22 is

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 27

Atomic number 22 has the following configuration:
22X = 1s2 2s2 2p6 3s2 3p6 4s2 3d2

Test: Quantum Mechanical Model of Atom - 2 - Question 28

Which of the following quantum numbers are correct for the outermost electron of sodium atom?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 28

11Na = 1s2 2s2 2p6 3s1
For 3s1, n = 3, l = 0, ml = 0, s = -1/2

Test: Quantum Mechanical Model of Atom - 2 - Question 29

Which of the following configurations does not follow Hund’s rule of maximum multiplicity?

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 29

The configuration does not follow Hund’s rule of maximum multiplicity because 3p will be fully filled before the electrons go to 4s.

Test: Quantum Mechanical Model of Atom - 2 - Question 30

Read the following statements and mark the incorrect statement.

Detailed Solution for Test: Quantum Mechanical Model of Atom - 2 - Question 30

The outer electronic configuration of chromium atom is 3d5 4s1.

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