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Test: Quantum Numbers & Electronic Configuration - NEET MCQ


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20 Questions MCQ Test Topic-wise MCQ Tests for NEET - Test: Quantum Numbers & Electronic Configuration

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Test: Quantum Numbers & Electronic Configuration - Question 1

Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q. Which is a possible set of quantum numbers for a valence unpaired electrons in ground state atom of phosphorus (Z = 15)?

       

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 1


Valence unpaired electrons are in 3p

Valence unpaired electrons are in 3p. 

Thus, (d).

Test: Quantum Numbers & Electronic Configuration - Question 2

For a multi-electron atom, set of quantum numbers is given as

2,0,0,1/2 ; 2,0,0,-1/2

Q. Thus, the next higher allowed set of n and / quantum numbers for this atom in its ground state is

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 2

Given a set of quantum numbers, n=2,l=0 for a multi-electron atom refers to 2s orbital. 

The next higher allowed set of 'n' and 'l' quantum numbers for this atom in the ground state is n=2,l=1. This corresponds to 2p orbital.

Note: The orbital with a higher value of the sum (n+l) has higher energy.

For 2s orbital (n+l)=(2+0)=2

For 2p orbital (n+l)=(2+1)=3

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Test: Quantum Numbers & Electronic Configuration - Question 3

Magnetic moments of the following isoelectronic species (24 electrons) are in order

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 3





Test: Quantum Numbers & Electronic Configuration - Question 4

The orbital angular momentum for a d-orbital electron is given by

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 4


Test: Quantum Numbers & Electronic Configuration - Question 5

The number of radial nodes in 3s and 2p respectively are

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 5

Radial nodes = (n - l - 1)
Angular nodes = l, total nodes = (n - 1), nodal plane = l

Test: Quantum Numbers & Electronic Configuration - Question 6

A hydrogen like species in fourth orbit has radius 1.5 times that of Bohr's orbit. In neutral state, its valence electron is in

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 6



Test: Quantum Numbers & Electronic Configuration - Question 7

Following suborbits with values of n and l are given

Q. Increasing order of energy of these suborbits is

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 7


By Aufbau rule, smaller the value of (n + I), smaller the energy. If (n + I) is same for two or more orbits, suborbit with lower value of n, has smaller energy.

Test: Quantum Numbers & Electronic Configuration - Question 8

The correct set of four quantum numbers for the valence electron of rubidium atom (Z = 37) is

[JEE Main 2013]

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 8

Test: Quantum Numbers & Electronic Configuration - Question 9

For Cr(24), (EC) : [Ar] 4s1 3d5 The number of electrons with l = 1 to l = 2 are respectively

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 9

EC of Cr (24) is

Test: Quantum Numbers & Electronic Configuration - Question 10

Last filling electron in lanthanides find place in 4f-orbital. Which of the following sets of quantum number is correct for an electron in 4f orbital?

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 10

4l -orbital 
Thus, n = 4, l = 3
m, (anyone) = - 3, - 2, - 1, 0, +1, + 2, + 3

 

*Multiple options can be correct
Test: Quantum Numbers & Electronic Configuration - Question 11

Direction (Q. Nos. 11-15) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or  MORE THANT ONE  is correct.

Q. Quantum numbers have been matched with their characteristics. Select correct matching(s).

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 11

(a) Three-dimensional shape of orbital is derived from angular quantum number: True
(d) Spin of the electron is derived from spin quantum number: True

Test: Quantum Numbers & Electronic Configuration - Question 12

In the following pair, each has two orbitals I and II. Select the ones in which II experiences larger effective nuclear charge than l

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 12

Nuclear charge is defined as the net positive charge experienced by an electron in the orbital of a multi-electron atom. The closer the orbital, the greater is the nuclear charge experienced by the electrons in it.

Since 3p is closer to nucleus than 3d so it will experience greater Z

Hence C

*Multiple options can be correct
Test: Quantum Numbers & Electronic Configuration - Question 13

In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 13

(a) 2s (b) 2 p (c) 3d (d) 3d
Thus, (c) and (d), both 3d, have equal energy.

*Multiple options can be correct
Test: Quantum Numbers & Electronic Configuration - Question 14

Which of the following statements is/are correct?

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 14

(a) Cr (24) = [Ar] 4s13d5 Correct
(b) K = 1s22s22 p63s23p64s1



(c) p-suborbit has three orbitals, each orbital can have maximum of two electrons thus, correct.
(d) s-suborbit has one orbital and this orbital can have maximum of two electrons thus, correct.

Test: Quantum Numbers & Electronic Configuration - Question 15

The quantum number which specifies the location of an electron as well as energy is      

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 15

Test: Quantum Numbers & Electronic Configuration - Question 16

Quantum Numbers are solutions of _____________

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 16

When the wave function for an atom is solved using the Schrodinger Wave Equation, the solutions obtained are called the Quantum Number which are basically n, l and m.

Test: Quantum Numbers & Electronic Configuration - Question 17

Which quantum numbers gives the shell to which the electron belongs?

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 17

 The principal quantum number, n, gives the shell to which the electron belongs. The energy of the shell is dependent on ‘n’.

Test: Quantum Numbers & Electronic Configuration - Question 18

Direction (Q. Nos. 18) Choice the correct combination of elements and column I and coloumn II  are given as option (a), (b), (c) and (d), out of which ONE option is correct.

Q. Match the entries in Column I with correctly related quantum number(s) in Column II 

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 18

(i) Orbital angular momentum L = 
L depends on the value of l (azimuthal quantum number)
(ii) To describe wave function (), n, I and m are needed, if, it obeys Pauli's exclusion principle, then s is also needed.
(iii) Value of n, I and m are needed to determine size, shape and orientation.
(iv) Probability density (2) is based on n, I and m

Test: Quantum Numbers & Electronic Configuration - Question 19

Direction (Q. Nos. 19 and 20) This section contains 2 questions. when worked out will result in an integer from 0 to 9 (both inclusive)

Q.   Bond order of 1.5 is shown by

Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 19

MO configuration of O2+ (8+8-1=15)


 

*Answer can only contain numeric values
Test: Quantum Numbers & Electronic Configuration - Question 20

The maximum number of electrons that can have principal quantum number, n = 3 and spin quantum number,


Detailed Solution for Test: Quantum Numbers & Electronic Configuration - Question 20

(9) n = 3 can have suborbits

Total nine electrons.

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