This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Atomic mass is expressed in A) Gm. B) Amu. C) Kg. D) Ml. Show Answer Correct Answer: B) Amu. 2. Q1) Which of the following is correct pair of elements and its symbols? A) Silver-SI. B) Zinc-s. C) Iron-Fe. D) Potassium-P. Show Answer Correct Answer: C) Iron-Fe. 3. The formula of lead is A) PB. B) Pb. C) Fb. D) None of the above. Show Answer Correct Answer: B) Pb. 4. "Matter can be neither be created nor be destroyed" is stated by A) Law of defined proportions. B) Law of conservation of mass. C) Proust's law. D) Dalton's Atomic theory. Show Answer Correct Answer: B) Law of conservation of mass. 5. Which element has the atomic number 6? A) Oxygen. B) Nitrogen. C) Carbon. D) Hydrogen. Show Answer Correct Answer: C) Carbon. 6. Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen would be required to react completely with 3 g of hydrogen gas? A) 8 g. B) 16 g. C) 24 g. D) 32 g. Show Answer Correct Answer: C) 24 g. 7. The formula of quick lime is A) Caco3. B) CaCl2. C) MgO. D) CaO. Show Answer Correct Answer: D) CaO. 8. Elements are made of A) Many types of atoms. B) The periodic table. C) One type of atom. D) Molecules. Show Answer Correct Answer: C) One type of atom. 9. The chemical symbol for sodium is A) So. B) Sd. C) NA. D) Na. Show Answer Correct Answer: D) Na. 10. To form a chemical formula, we need to know about A) The atomic mass of an element. B) The mass of an element. C) Valency of an element. D) All of these. Show Answer Correct Answer: C) Valency of an element. 11. What is the atomic mass of nitrogen? A) 14 amu. B) 12 amu. C) 16 amu. D) 1 amu. Show Answer Correct Answer: A) 14 amu. 12. What is the chemical symbol of the element Hydrogen? A) Hy. B) H. C) Hydro. D) Hg. Show Answer Correct Answer: B) H. 13. What does the atomic number represent? A) How many atoms are in a group. B) How much an atom weighs. C) The number of protons in the nucleus of the atom. D) None of the above. Show Answer Correct Answer: C) The number of protons in the nucleus of the atom. 14. What is the charge of an electron? A) +1. B) -1. C) 0. D) None of the above. Show Answer Correct Answer: B) -1. 15. Calculate the formula unit mass of ZnO A) Put out. B) Member. C) 83U. D) 81U. Show Answer Correct Answer: D) 81U. 16. What is the molecular mass of acetic acid ( CH3 COOH)? A) 56 u. B) 46 u. C) 60 u. D) 90 u. Show Answer Correct Answer: C) 60 u. 17. Molecules are compared to A) Words. B) Sentences. C) Numbers. D) Algebra. Show Answer Correct Answer: A) Words. 18. Q8) The balancing of Chemical equations is based upon A) Law of conservation of mass. B) Law of definite proportion. C) Law of multiple proportion. D) Law of combining volumes. Show Answer Correct Answer: A) Law of conservation of mass. 19. Animals take in energy as ..... and convert it to ..... , the energy cells can use. A) Fat, ADP. B) Fat, ATP. C) Glucose, ADP. D) Glucose, ATP. Show Answer Correct Answer: D) Glucose, ATP. 20. 1) Number Valance shell and Electron in Nitrogen atom.*Choose the most appropriate option 2) Electronic configuration of element Ar3) Valency of element P A) L shell, 5 2) 2, 8, 8, 13) 3. B) L shell, 5 2) 2, 8, 8, -3) 3, 5. C) L shell, 5 2) 2, 2, 8, 83) X. D) L shell, 6 2) 2, 8, 8, 0 3) 3, 0. Show Answer Correct Answer: B) L shell, 5 2) 2, 8, 8, -3) 3, 5. 21. In a chemical reaction 150 g Baking soda mixture containing sodium bicarbonate and vinegar on heating gives 87 g of carbon dioxide gas. What mass of solid residue will left in food? A) 63 grams. B) 65 grams. C) 36 grams. D) 87 grams. Show Answer Correct Answer: A) 63 grams. 22. The molar mass of Laughing gas is A) 44 g/mol. B) 44 u. C) 56 g/mol. D) 56 u. Show Answer Correct Answer: A) 44 g/mol. 23. How many atoms are present in a (I) H2 S molecule and (ii) PO4 (3-) A) 5, 3. B) 3, 5. C) 5, 4. D) 7, 8. Show Answer Correct Answer: B) 3, 5. 24. The atomicity of white Phosphorus is A) 3. B) 4. C) 5. D) 6. Show Answer Correct Answer: B) 4. 25. Different elements exist due to? A) Different number of atoms in elements. B) Different number of molecules. C) Different number of protons. D) None of the above. Show Answer Correct Answer: C) Different number of protons. ← 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 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 10Class 9 Science Chapter 3 Atoms And Molecules Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books