Quiz for Atomic Structure-

Q1: What is the radius of the first Bohr orbit of a hydrogen atom?

A. 5.29 × 10⁻¹¹ m B. 1.06 × 10⁻¹⁰ m C. 2.12 × 10⁻¹⁰ m D. 0.53 × 10⁻⁹ m

Q2: In hydrogen atom, the energy of an electron in the first orbit is?

A. -13.6 eV B. -3.4 eV C. -1.51 eV D. -0.85 eV

Q3: Which quantum number determines the shape of the orbital?

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

Q4: Which transition in the hydrogen atom emits the highest energy photon?

A. n=2 to n=1 B. n=3 to n=2 C. n=4 to n=3 D. n=5 to n=4

Q5: What is the maximum number of electrons in a shell with principal quantum number n?

A. 2n B. n² C. 2n² D. n(n+1)

Q6: Which quantum number is associated with the orientation of orbitals?

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

Q7: Which of the following is not a permissible set of quantum numbers?

A. n=3, l=2, m=1 B. n=2, l=2, m=0 C. n=4, l=1, m=0 D. n=1, l=0, m=0

Q8: The spectral lines in the Lyman series of hydrogen lie in which region?

A. Visible B. Infrared C. Ultraviolet D. X-rays

Q9: Which postulate of Bohr explains line spectra of hydrogen?

A. Quantization of angular momentum B. Electrons revolve in circular orbits C. Electrons lose energy continuously D. Nucleus is at rest

Q10: The angular momentum of an electron in nth Bohr orbit is proportional to?

A. n² B. n C. √n D. 1/n

Q11: What is the ionization energy of hydrogen atom?

A. 13.6 eV B. 3.4 eV C. 1.51 eV D. 0.85 eV

Q12: How many orbitals are possible for n=3?

A. 3 B. 6 C. 9 D. 18

Q13: The total number of orbitals in a shell is given by?

A. n B. 2n C. n² D. 2n²

Q14: Which of the following transitions corresponds to the emission of a photon?

A. n=1 to n=2 B. n=2 to n=1 C. n=2 to n=3 D. n=3 to n=4

Q15: What is the principal quantum number for the 2p orbital?

A. 1 B. 2 C. 3 D. 4

Q16: Which orbital has the lowest energy?

A. 2s B. 2p C. 3s D. 3p

Q17: Spin quantum number can have values?

A. +1/2 or -1/2 B. 0 or 1 C. 1/2 or 3/2 D. -1/2 or -1

Q18: How many nodal planes does a p-orbital have?

A. 0 B. 1 C. 2 D. 3

Q19: The maximum number of electrons in a p-subshell is?

A. 2 B. 4 C. 6 D. 8

Q20: Bohr’s model fails for which type of atom?

A. Hydrogen B. Singly ionized helium C. Lithium ion (Li²⁺) D. Multi-electron atoms