Higher Secondary Certificate Examination (Bangladesh) · Chemistry

Atomic Structure, Periodic Properties and Chemical Bonding

35 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 35 questions

  1. What are the allowed values of the magnetic quantum number m_l for an orbital with azimuthal quantum number l = 2 (d-subshell)?
  2. What is the maximum number of electrons that can be accommodated in a principal energy shell with principal quantum number n?
  3. What is the ground-state electron configuration of a Chromium atom (atomic number Z = 24)? (Hard)
  4. What is the ground-state electron configuration of a Copper atom (atomic number Z = 29)? (Hard)
  5. Which spectral line series of the hydrogen atomic spectrum falls in the visible region of the electromagnetic spectrum?
  6. Which spectral series of atomic hydrogen transitions terminates at the ground state n1 = 1 and falls in the ultraviolet region?
  7. According to the Pauli Exclusion Principle, what is the maximum number of electrons in an atom that can have the exact same set of all four quantum numbers?
  8. According to Hund's Rule of Maximum Multiplicity, how do electrons occupy degenerate orbitals of equal energy?
  9. What is the hybridization of the central Carbon atom in a Methane (CH4) molecule?
  10. What is the bond angle in a Methane (CH4) molecule with regular tetrahedral geometry?
  11. What is the shape and approximate bond angle of an Ammonia (NH3) molecule according to VSEPR theory?
  12. What is the molecular geometry and bond angle of a Water (H2O) molecule according to VSEPR theory?
  13. What is the hybridization and molecular geometry of Phosphorus Pentachloride (PCl5) in the gas phase? (Hard)
  14. What is the hybridization and geometry of Sulfur Hexafluoride (SF6)?
  15. Which element has the highest electronegativity on the Pauling scale?
  16. Which element in the periodic table has the highest first electron affinity (exothermic electron gain enthalpy)? (Hard)
  17. Why is the first ionization energy of Nitrogen (Z = 7) higher than that of Oxygen (Z = 8)? (Hard)
  18. Which type of intermolecular force is responsible for the unusually high boiling point of Water compared to Hydrogen Sulfide (H2S)?
  19. What is the bond order of a diatomic Oxygen molecule (O2) according to Molecular Orbital Theory?
  20. According to Molecular Orbital Theory, why is the diatomic Oxygen molecule (O2) paramagnetic? (Hard)
  21. What is the bond order of a diatomic Nitrogen molecule (N2)?
  22. Which of the following molecules has a permanent dipole moment of zero (non-polar)?
  23. What is the general trend in atomic radius across a period from left to right in the modern periodic table?
  24. What is the shape of an orbital associated with azimuthal quantum number l = 1?
  25. How many degenerate orbitals exist in an f-subshell (azimuthal quantum number l = 3)?
  26. What is the total number of nodes (radial + angular) in a 3p atomic orbital? (Hard)
  27. According to de Broglie relation and Heisenberg Uncertainty Principle, why can an electron not reside inside an atomic nucleus? (Hard)
  28. What is the oxidation number of Chromium in Potassium Dichromate (K2Cr2O7)?
  29. What is the oxidation state of Manganese in Potassium Permanganate (KMnO4)?
  30. Which property of alkaline earth metals increases systematically down Group 2?
  31. What is the shape and hybridization of the Xenon Tetrafluoride (XeF4) molecule? (Hard)
  32. Which element has the lowest first ionization energy in Period 3?
  33. Why is Boron Trifluoride (BF3) a non-polar molecule despite containing polar B-F bonds?
  34. What is the nature of the coordinate covalent (dative) bond in Ammonium ion (NH4+)?
  35. What is the bond angle in a Beryllium Chloride (BeCl2) molecule in the gaseous state?

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