This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 11 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the chemical formula of sodium carbonate? A) On $ _ {2} $ co $ _ {3} $. B) NaHCO $ _ {3} $. C) Naco $ _ {3} $. D) To $ _ {2} $ hco $ _ {3} $. Show Answer Correct Answer: A) On $ _ {2} $ co $ _ {3} $. 2. Sulphide is an ion formed from only one type of atoms. (True / False) A) True. B) False. C) Can be true or false. D) None of the above. Show Answer Correct Answer: A) True. 3. 1 nanometer = A) $\frac{1}{10^9}m$. B) $ 10^yam $. C) $\frac{1}{10^{19}}m$. D) $10^3$. Show Answer Correct Answer: A) $\frac{1}{10^9}m$. 4. Q9) The number of moles of oxygen atom in 2 moles of nitric acid? A) 8. B) 7. C) 6. D) 5. Show Answer Correct Answer: C) 6. 5. 'S' is the symbol of ..... A) Silicon. B) Sulfur. C) Sodium. D) Above all. Show Answer Correct Answer: B) Sulfur. 6. Q2) How many moles are present in 40 g of He? A) 10 moles. B) 11 moles. C) 12 moles. D) 13 moles. Show Answer Correct Answer: A) 10 moles. 7. A sample of NH$_{3}$ molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. QUESTION:The above data/extract/source supports which of the following law? A) Law of Conservation of Mass. B) Law of Constant Proportion. C) Dalton's Atomic Postulate. D) Law of conservation of Momentum. Show Answer Correct Answer: B) Law of Constant Proportion. 8. Which of the following has the highest atomic mass? A) Hydrogen. B) Carbon. C) Oxygen. D) Nitrogen. Show Answer Correct Answer: C) Oxygen. 9. The atomicity of K$_{2}$Cr$_{2}$O$_{7}$ is: A) 9. B) 11. C) 10. D) 12. Show Answer Correct Answer: B) 11. 10. The example of minoatomic ions is A) Phosphate ion. B) Sulphate ion. C) Chloride ion. D) Carbonate ion. Show Answer Correct Answer: C) Chloride ion. 11. What is the molar mass of carbon? A) 6.0 g/mol. B) 12.0 g/mol. C) 22.4 g/mol. D) 6.02 x 10$^{23 }$g/mol. Show Answer Correct Answer: B) 12.0 g/mol. 12. Convert it into mole i) 20 g of water A) 1.23 mole. B) 1.37 mole. C) 1.1 mole. D) 2 moles. Show Answer Correct Answer: C) 1.1 mole. 13. What is the mass of one mole of a substance called? A) Atomic mass. B) Molecular mass. C) Molar mass. D) Formula mass. Show Answer Correct Answer: C) Molar mass. 14. Amu is the abbrevation unit of? A) Mole. B) Volume. C) Mass. D) No. of particles. Show Answer Correct Answer: C) Mass. 15. Name the scientist who put forth the law of constant proportion A) Rutherford. B) Newton. C) Antoine lavoisier. D) J.L.PROUST. Show Answer Correct Answer: D) J.L.PROUST. 16. Which one of these is an ion? A) Na. B) H$_{2}$O. C) Cl$_{2}$. D) That $^{+} $. Show Answer Correct Answer: D) That $^{+} $. 17. Atomic mass of sodium is A) 13. B) 23. C) 21. D) 19. Show Answer Correct Answer: B) 23. 18. Who named the smallest particles are called Parmanu A) You have. B) Katyayama. C) Lavoisier. D) Dalton. Show Answer Correct Answer: A) You have. 19. Which has more molecular mass:NH$_{3}$ or O$_{2 }$?(Atomic mass of N = 14, H = 1, O = 16) A) NH$_{3}$. B) O$_{2 }$. C) Both have same molecular mass. D) None of the above. Show Answer Correct Answer: B) O$_{2 }$. 20. What is the valency of an element? A) The number of protons in the nucleus. B) The number of neutrons in the nucleus. C) The combining capacity of an element. D) The number of electrons in the outermost shell. Show Answer Correct Answer: C) The combining capacity of an element. 21. The combining capacity of an element is called A) Valency. B) Atomicity. C) Atomic number. D) Valence electron. Show Answer Correct Answer: A) Valency. 22. What is the molecular formula of hydrochloric acid? A) H2Cl. B) HCl. C) HCl2. D) None of the above. Show Answer Correct Answer: B) HCl. 23. Which of the following represents a correct chemical formula of Sodium chloride A) (a) CaCl. B) (b) Bipo $ _ {4} $. C) C) NaSO$_{4}$. D) D) Nacl. Show Answer Correct Answer: D) D) Nacl. 24. The short-hand notation of an element is called ..... A) Formula. B) Symbol. C) Mark. D) Representation. Show Answer Correct Answer: B) Symbol. 25. The valency of nitrogen in NH3 is A) 1. B) 4. C) 3. D) 2. Show Answer Correct Answer: C) 3. ← PreviousNext →Related 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