This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 17 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 17 (18 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The particles that are found in the nucleus of an atom are A) Neutrons and electrons. B) Electrons only. C) Protons and neutrons. D) Protons and electrons. Show Answer Correct Answer: C) Protons and neutrons. 2. Which scientist developed the atomic theory? A) JJ Thomson. B) Ernest Rutherford. C) John Dalton. D) James Chadwick. Show Answer Correct Answer: C) John Dalton. 3. What is the definition of law of constant proportion? A) The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass. B) The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by atomic number. C) It is based on atomic mass. D) Use. Show Answer Correct Answer: A) The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass. 4. Which of the following represents a molecule? A) $O_2$. B) $ Na^+$. C) $Cl^-$. D) $H_2O$. Show Answer Correct Answer: D) $H_2O$. 5. Which of the following represents a correct chemical formula? A) B IPO$_{4}$. B) NaSO$_{4}$. C) NaS. D) Cock. Show Answer Correct Answer: A) B IPO$_{4}$. 6. The valency of nitogen in NH3 A) 1. B) 2. C) 4. D) 3. Show Answer Correct Answer: D) 3. 7. The relative atomic mass of Cl is A) 35.5 u. B) 35.5. C) 37 u. D) 37. Show Answer Correct Answer: B) 35.5. 8. B + B $\rightarrow$ $B_2$ A) Molecule of an element. B) Molecule of a compound. C) All the above. D) None of the above. Show Answer Correct Answer: A) Molecule of an element. 9. Element with atomic number 104 was discovered simultaneously by the Americans and Russians. The Russian scientists proposed the name 'Kurchatovium' and the American scientists suggested the name 'Rutherfordium' for the new element. In such a dispute, which organization they should go to: A) International Court of Justice. B) Royal Society of Chemistry. C) International Union of Pure and Applied Chemistry. D) Association of Chemistry Teachers. Show Answer Correct Answer: C) International Union of Pure and Applied Chemistry. 10. The symbol of Mercury is taken from its latin name: A) Copper. B) Stibium. C) Silver. D) Hydrargyrum. Show Answer Correct Answer: D) Hydrargyrum. 11. ..... come together to form all the matter around us. A) Atoms. B) Elements. C) Compounds. D) Use. Show Answer Correct Answer: A) Atoms. 12. WHCH OF THE FOLLOWING IS NOT CORRECTLY MATCHED1. PHOSPHATE-PO$_{4}$$^{3-}$2. NO$_{3}$$^{-}$ NITRIDE3. SO$_{4}$$^{2-}$ SULPHATE4. HYDRIDE-H$^{-}$ A) 1. B) 4. C) 2. D) 3. Show Answer Correct Answer: C) 2. 13. An Indian sage who postulated the atom in his VISHESIKA SUTRA A) Maharishi kanad. B) Maharishi Kashapa. C) Maharishi kanad and kasyapa. D) None of the above. Show Answer Correct Answer: C) Maharishi kanad and kasyapa. 14. Number of moles present in 28 gm of Nitrogen atoms are A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 15. What is the mass of i)0.2 mole of oxygen atom? A) 3.2g. B) 32g. C) 45g. D) 320.0G. Show Answer Correct Answer: A) 3.2g. 16. Atomicity of phosphorus namaste is A) Monoatomic. B) Diatomic. C) Poly atomic. D) Tetra atomic. Show Answer Correct Answer: D) Tetra atomic. 17. 1 MOLE OF ANY SUBSTANCE = ..... OF THE SUBSTANCE A) Atomic/Molecular mass in grams. B) Atomic/ Molecular mass in amu. C) All the above. D) None of the above. Show Answer Correct Answer: A) Atomic/Molecular mass in grams. 18. Can atoms of same element have different masses A) Both b and c. B) No. C) Yes. D) None. Show Answer Correct Answer: C) Yes. ← PreviousRelated QuizzesClass 9 Science Chapter 3 Atoms And Molecules Quiz 1Class 9 Science Chapter 3 Atoms And Molecules Quiz 2Class 9 Science Chapter 3 Atoms And Molecules Quiz 3Class 9 Science Chapter 3 Atoms And Molecules Quiz 4Class 9 Science Chapter 3 Atoms And Molecules Quiz 5Class 9 Science Chapter 3 Atoms And Molecules Quiz 6Class 9 Science Chapter 3 Atoms And Molecules Quiz 7Class 9 Science Chapter 3 Atoms And Molecules Quiz 8Class 9 Science Chapter 3 Atoms And Molecules Quiz 9Class 9 Science Chapter 3 Atoms And Molecules Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books