Free Quantum Numbers MCQs with Answers

• A. 6
• B. 10
• C. 14
• D. 18

Explanation: For l = 3, the subshell is an f subshell and it contains 2l + 1 = 2(3) + 1 = 7 orbitals.

• A. Principal (QN)
• B. Azimuthal (QN)
• C. Spin (QN)
• D. Both A & B

Explanation: The magnetic quantum number, m_l, has values from -l to +l, so its possible values are directly determined by the azimuthal quantum number…

• A. Plancks theory
• B. Dual nature of matter
• C. Heisenbergs uncertainty principle
• D. All of these

Explanation: Bohr's model assigns an electron a definite circular orbit, but Heisenberg's uncertainty principle states that exact position and momentum…

• A. n=3 l=2
• B. n=3 l=0
• C. n=3 l=1
• D. n=3 l=3

Explanation: A p subshell always has the azimuthal quantum number l = 1, and the number 3 indicates the principal quantum number n = 3.

• A. 6
• B. 4
• C. 3
• D. 2

Explanation: An orbital is specified by one value of the magnetic quantum number, m, and any one orbital can contain a maximum of two electrons with…

• A. n
• B. m
• C. s
• D. I

Explanation: The shape of an orbital is described by the azimuthal quantum number or orbital angular momentum quantum number (l).

• A. 5p
• B. 5d
• C. 5s
• D. 5f

Explanation: Quantum numbers are the basis of the sequence, arrangement, shape, and orientation of the elements in periodic table.

• A. 2 (2l - 1)
• B. 2 (2l + 1)
• C. 2(l + 1)
• D. 2l + 1

Explanation: The maximum number of electrons in a subshell is given by the formula 2n², where "n" represents the principal quantum number of the…

• A. n=2,1=0, m=0
• B. nm23, 0=1, =1
• C. n= 3, l=5 ,m=2
• D. n=4, t=, m=2

Explanation: option b is incorrect because the l value should be less than n but here l value is greater l=n-1

• A. 3
• B. 2
• C. 0
• D. 1

Explanation: The azimuthal quantum number, represented by the symbol l, defines the shape of the orbital.

• A. n = 2, l = 2, m = 0, s = +1/2
• B. n = 3, l = 1, m = 0, s = +1/2
• C. n = 4, l = 3, m = 4, s = -1/2
• D. n = 4, l = 2, m = 4, s = -1/2

Explanation: The correct answer is Option B: n = 3, l = 1, m = 0, s = +1/2. This set of quantum numbers is valid because:n (principal quantum number)…

• A. 1, 2
• B. 0, 1, 2
• C. 1, 2, 3
• D. -1, 0, 1

Explanation: The principal quantum number (n) determines the energy level of an electron in an atom.

• A. 0
• B. 1
• C. 2
• D. 3

Explanation: This option is incorrect because all orbitals, by definition, have the capacity to hold at least one electron.

• A. Principal quantum number
• B. Azimuthal quantum number
• C. Magnetic quantum number
• D. Spin quantum number

Explanation: The principal quantum number (n) represents the energy level or shell of an electron.

• A. 18
• B. 3
• C. 9
• D. 1

Explanation: This option is incorrect because, the 3p sublevel, which is one of the sublevels in n = 3, can hold a maximum of 6 electrons, and half of…

• A. 4
• B. 3
• C. 2
• D. 1

Explanation: This is incorrect. The 4s orbital has 3 spherical nodes, not 4. Applying the formula, we get: Number of spherical nodes = n - l - 1 = 4 -…

• A. 3
• B. 5
• C. 7
• D. None

Explanation: Degeneracy refers to the number of orbitals within a subshell that have the same energy.

• A. 2l+2
• B. 2(2l+1)
• C. 2l+1
• D. 2(l+1)

Explanation: The formula for calculating electrons is not 2l + 2. This option is incorrect because it adds an extra 2 to the formula.The formula…

• A. Different orientation and different shape
• B. Different energy and same shape
• C. Different orientation and same energy
• D. Same orientation and same shape
• E. Same energy and same orientation

Explanation: In quantum chemistry, orbitals that belong to the same subshell (such as 2p or 3d) have the same energy level but differ in their spatial…

• A. 14
• B. 16
• C. 10
• D. 12

Explanation: The maximum number of electrons in a subshell is calculated using the formula 2(2l + 1), where l is the azimuthal quantum number.