Free Atomic Structure MCQs with Answers

• A. Bohr's
• B. De-Broglie
• C. Hund's
• D. Schrodinger

Explanation: The concept of the probability of finding an electron at a certain position is a fundamental principle of quantum mechanics.

• A. Ar
• B. He
• C. H2
• D. Ne

Explanation: Canal rays are positively charged ions that are produced in a discharge tube when a high voltage is applied across a gas at low pressure.

• A. Greater is its energy
• B. Smaller is its energy
• C. Its energy will be variable
• D. Its energy will remain constant

Explanation: The energy of a photon is given by Planck's equation asE=hc/ λSince energy is inversely proportional to the wavelength of a photon so a…

• A. Bracket series
• B. Pfund series
• C. Balmer series
• D. Paschen series

Explanation: The Pfund series of the hydrogen spectrum has as its longest wavelength component a line at 7400nm Describe the electron transitions that…

• A. m
• B. n
• C. s
• D. l

Explanation: 'n' represents principal quantum number.

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

Explanation: Shape is explained by azimuthal quantum number.

• A. Aufbau principle
• B. N + l rule
• C. Hunds rule
• D. Pauli exclusion principle

Explanation: In Hund's rule, every orbital in a subshell is singly occupied with one electron before any one orbital is doubly occupied, and all…

• A. Decrease
• B. Increase
• C. May or may not remain the same
• D. Remain the same

Explanation: As the principle quantum number 'n' increases, the size of the s-orbital increases.

• A. -1.602 x 10^-19C
• B. 1.602 x 10^-15C
• C. 1.602 x 10^-2C
• D. 1.602 x 10^-18C
• E. 1.602 x 10^-1C

Explanation: The correct answer is Option A: -1.602x10-19C. This value is the recognized elementary charge representing the negative charge carried by…

• A. Aufbau principle
• B. Pauli's exclusion principle
• C. Hund's rule
• D. Wissewser rule
• E. Magnetic quantum number

Explanation: Pauli's exclusion principle states that no two fermions (such as electrons) can occupy the same quantum state simultaneously within an…

• A. n2
• B. 2(n+1)
• C. 2n2
• D. 2(2l+1)
• E. 2+1

Explanation: 2(2l + 1) is the correct formula for the maximum number of electrons in a subshell, as it accounts for the number of orbitals (2l + 1) in…

• A. me
• B. mv
• C. me²
• D. moc²
• E. hv/c

Explanation: hv/c: This is the correct formula for the linear momentum of a photon, where h is Planck's constant, v is the frequency of the photon, and…

• A. Beta-rays
• B. Gamma-rays
• C. X-rays
• D. Cosmic rays
• E. Alpha-rays

Explanation: X-ray generation occurs when heated electrons are accelerated towards a tungsten target.

• A. 2 lobes
• B. 3 lobes
• C. 4 lobes
• D. 5 lobes

Explanation: The p orbital has 2 lobes because its wavefunction solution to the Schrödinger equation has a single node at the nucleus, leading to two…

• A. 1s2, 2s2, 2p3
• B. 1s2, 2s2, 2P4
• C. 1s2, 2s2, 2p2
• D. 1s2, 2s2, 2p1

Explanation: This option is correct. This is the correct configuration for carbon.

• A. 1837 times greater than
• B. equal to
• C. greater than
• D. smaller than

Explanation: The e/m ration of a proton is less than that of an electron.

• A. 2
• B. 6
• C. 10
• D. 12

Explanation: l=2 is the azimuthal quantum number of the d subshell, which can accommodate 10 electrons.

• A. C
• B. Cl
• C. S
• D. Si

Explanation: The electronic configuration of the outermost shell like ns2 np5 corresponds to elements in Group 17 of the periodic table, also known as…

• A. Stark effect
• B. Zeeman effect
• C. Aufbau principle
• D. Pauli's exclusion principle

Explanation: In the Zeeman effect, magnetic field causes the electrons in an atom to have different energies, depending on their orientation in the…

• A. Have consist of moving material particles
• B. Have definite mass
• C. Have definite velocity
• D. Travel with the velocity of light

Explanation: This is incorrect. Cathode rays travel at a fraction of the speed of light.