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Test: Quantum Mechanical Model of Atom - Chemistry MCQ


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10 Questions MCQ Test - Test: Quantum Mechanical Model of Atom

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Test: Quantum Mechanical Model of Atom - Question 1

Write the values for l, n, and m for Ψ3,1,0?

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

The representation of the Schrodinger wave function is given by Ψn,l,m. Therefore by comparing Ψn,l,m and Ψ3,1,0 we get that n = 3, l = 1 and m = 0. Here n, l, and m are principal, azimuthal and magnetic quantum numbers respectively. but rememberr they are asking for l , n , m that's why a) option is correct

Test: Quantum Mechanical Model of Atom - Question 2

The below process of filling electrons in an orbital follows __________
Hund’s rule of maximum multiplicity the process of filling electrons in an orbital

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

According to Hund’s rule of maximum multiplicity, the pairing of electrons cannot be started until each of the orbitals is singly occupied. The reason behind this is that the half-filled or fully filled orbitals are much more stable comparatively.

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Test: Quantum Mechanical Model of Atom - Question 3

According to the Aufbau’s principle, which of the following orbital should be filled first?

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

As per the Aufbau’s principle, the orbital or subshell with the lowest energy should be filled first. The ascending order of orbital’s energy is given by 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 4f, 5d, 6p, 7s. So 2s orbital should be filled first.

Test: Quantum Mechanical Model of Atom - Question 4

Total number of nodes for 3d orbital is ________

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

Total number of nodes include angular and radial nodes. Angular nodes and radial nodes are given by the formula n – l -1 and l respectively. So the total number of nodes are n – l -1 + l = n – 1. For 3d orbit, “n” is 3, so total number nodes is 3 – 1 = 2.

Test: Quantum Mechanical Model of Atom - Question 5

What is the shape the orbital, whose “l” is 1?

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

The azimuthal quantum number is given by “l”. When l = 0, 1, 2 and 3, they are s-orbital, p-orbital, d-orbital and f-orbital respectively. The shapes of s-orbital, p-orbital, d-orbital, and f-orbital are Spherical, Dumbbell, Double dumbbell and Complex respectively.

Test: Quantum Mechanical Model of Atom - Question 6

How many electrons can exist with the principal quantum number’s value as 4?

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

The number of orbitals within an orbit is n2. But as each orbital can accommodate 2 electrons, the number of electrons that can exist with the “n” as the principal quantum number is 2n2. So here 2n2 = 2(4)2 = 2(16) = 32.

Test: Quantum Mechanical Model of Atom - Question 7

Which of the following set of quantum numbers is not valid?

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

The set of quantum number n = 1, l = 2, m = 0, s = 1/2, is not valid because the value of azimuthal quantum number should lie only in between 0 and n-1, where n is principal quantum number. So the above set of quantum numbers is not valid.

Test: Quantum Mechanical Model of Atom - Question 8

What is the magnetic quantum number of the orbital 2pz?

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

The magnetic quantum of an orbital range from -( l – 1) to l – 1. Its symbol is given by m. For 2p orbital, there are 3 magnetic quantum numbers namely -1, 0 and 1. For 2pz orbital its 0, taken that z is the internuclear axis.

Test: Quantum Mechanical Model of Atom - Question 9

The principal quantum number describes ____

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

Among the four quantum numbers, the principal quantum number describes the size and energy of the orbit. It is represented by the symbol “n”. For shells, K, L, M, N and O, n is given by 1, 2, 3, 4 and 5.

Test: Quantum Mechanical Model of Atom - Question 10

No two electrons have the same set of all four quantum numbers.

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

Yes, no two electrons have the same set of all four quantum numbers. This is explained by Pauli’s exclusive principle. At most electrons can have all 3 quantum numbers the same as they are in the same orbital. But the spin quantum number’s values are different.

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