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Test: Quantum Mechanics (April 29) - NEET MCQ


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10 Questions MCQ Test - Test: Quantum Mechanics (April 29)

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Test: Quantum Mechanics (April 29) - Question 1

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 Mechanics (April 29) - Question 1

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

Test: Quantum Mechanics (April 29) - Question 2

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

Detailed Solution for Test: Quantum Mechanics (April 29) - Question 2


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Test: Quantum Mechanics (April 29) - Question 3

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 Mechanics (April 29) - Question 3



Test: Quantum Mechanics (April 29) - Question 4

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 Mechanics (April 29) - Question 4

Test: Quantum Mechanics (April 29) - Question 5

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 Mechanics (April 29) - Question 5

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

 

Test: Quantum Mechanics (April 29) - Question 6

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 Mechanics (April 29) - Question 6

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 Mechanics (April 29) - Question 7

Which of the following statements is/are correct?

Detailed Solution for Test: Quantum Mechanics (April 29) - Question 7

(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 Mechanics (April 29) - Question 8

Quantum Numbers are solutions of _____________

Detailed Solution for Test: Quantum Mechanics (April 29) - Question 8

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 Mechanics (April 29) - Question 9

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 Mechanics (April 29) - Question 9

(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

*Answer can only contain numeric values
Test: Quantum Mechanics (April 29) - Question 10

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


Detailed Solution for Test: Quantum Mechanics (April 29) - Question 10

(9) n = 3 can have suborbits

Total nine electrons.

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