QUBEE ACADEMY

📚CHEMISTRY EUEE QUESTIONS 1. The first atomic theory was proposed by:   (A) Niels Bohr   (B) Ernest Rutherford   (C) John Dalton   (D) J.J. Thomson 2. Dalton's atomic theory stated that all atoms of a given element are:   (A) Different in size   (B) Different in mass   (C) Identical in mass and properties   (D) Composed of smaller particles 3. Who discovered the electron?   (A) Ernest Rutherford   (B) James Chadwick   (C) J.J. Thomson   (D) Max Planck 4. Thomson's atomic model is known as the:   (A) Nuclear model   (B) Planetary model   (C) Plum pudding model   (D) Quantum mechanical model 5. Rutherford's gold foil experiment led to the discovery of the:   (A) Electron   (B) Neutron   (C) Nucleus   (D) Proton 6. Rutherford's atomic model proposed that the atom is mostly:   (A) Solid   (B) Liquid   (C) Empty space   (D) Filled with electrons 7. Which particle is NOT found in the nucleus of an atom?   (A) Proton   (B) Neutron   (C) Electron   (D) Nucleon 8. The atomic number of an element represents the number of:   (A) Neutrons in the nucleus   (B) Protons in the nucleus   (C) Electrons in the outermost shell   (D) Total number of particles in the nucleus 9. Isotopes of an element have the same number of:   (A) Neutrons   (B) Protons   (C) Mass number   (D) Both protons and neutrons 10. Who proposed that electrons orbit the nucleus in specific energy levels or shells?   (A) Ernest Rutherford   (B) J.J. Thomson   (C) Niels Bohr   (D) Max Planck 11. Bohr's atomic model successfully explained the:   (A) Spectra of all elements   (B) Spectra of hydrogen   (C) Existence of isotopes   (D) Wave nature of electrons 12. In Bohr's model, electrons can move to a higher energy level by:   (A) Emitting energy   (B) Absorbing energy   (C) Colliding with other electrons   (D) Moving closer to the nucleus 13. The quantum mechanical model of the atom treats electrons as:   (A) Particles only   (B) Waves only   (C) Both particles and waves   (D) Neither particles nor waves 14. Which principle states that it is impossible to know both the exact position and momentum of an electron simultaneously?   (A) Pauli Exclusion Principle   (B) Hund's Rule   (C) Heisenberg Uncertainty Principle   (D) Aufbau Principle 15. Atomic orbitals are regions of space where there is a high probability of finding:   (A) Protons   (B) Neutrons   (C) Electrons   (D) The nucleus 16. Which quantum number describes the shape of an atomic orbital?   (A) Principal quantum number (n)   (B) Azimuthal quantum number (l)   (C) Magnetic quantum number (ml)   (D) Spin quantum number (ms) 17. The maximum number of electrons that can occupy a p subshell is:   (A) 2   (B) 4   (C) 6   (D) 10 18. Which rule states that electrons will individually occupy each orbital within a subshell before doubling up in any one orbital?   (A) Pauli Exclusion Principle   (B) Hund's Rule   (C) Heisenberg Uncertainty Principle   (D) Aufbau Principle 19. According to the Aufbau principle, electrons fill orbitals in order of:   (A) Increasing energy   (B) Decreasing energy   (C) Increasing atomic number   (D) Decreasing atomic number 20. What does the Pauli Exclusion Principle state?   (A) Electrons must fill the lowest energy levels first   (B) No two electrons in the same atom can have the same set of four quantum numbers   (C) Electrons must occupy each orbital within a subshell individually before pairing up   (D) It is impossible to know both the exact position and momentum of an electron simultaneously Answers: 1. C 2. C 3. C 4. C 5. C 6. C 7. C 8. B 9. B 10. C 11. B 12. B 13. C 14. C 15. C 16. B 17. C 18. B 19. A 20. B  IDEA FOR ALL STUDENTS TO GET OTHER EUEE QUIZ JOIN BELOW LINK OR DABOO QUIZ [Channel Link👇👇 https://t.me/Abdii_oromoo https://t.me/Abdii_oromoo https://t.me/qubeeacademy https://t.me/qubeeacademy Don't forget if you like react now. For video Lectures check our youtube channel 👇👇👇👇👇👇👇 https://youtube.com/channel/UCLPTQfMXS6we7aTT4g9MwCw