This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 20 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The empirical formula and molecular mass of a compound are CH$_{2}$O and 180 g respectively. What will be the molecular formula of the compound? A) CH$_{4}$. B) HCHO. C) C$_{6}$H$_{12}$O$_{6}$. D) CH$_{3}$OH. Show Answer Correct Answer: C) C$_{6}$H$_{12}$O$_{6}$. 2. Oxidation no. of hydrogen is ..... A) 0. B) +1. C) -1. D) None of the above. Show Answer Correct Answer: B) +1. 3. Which is more informative? A) Empirical Formula. B) Molecular Formula. C) All the above. D) None of the above. Show Answer Correct Answer: B) Molecular Formula. 4. Functional group of amine is A) CHO. B) -NH2. C) COOH. D) -CONH2. E) 2. Show Answer Correct Answer: B) -NH2. 5. What is the number of moles in 222.0 g of Ca(OH)$_{2}$ A) 4 moles. B) 5 moles. C) 2 moles. D) 3 moles. Show Answer Correct Answer: D) 3 moles. 6. If we consider that 1/6 in place of 1/12carbon atom is taken to be relative atomic mass unit, the mass of one mole of a substance will A) Be a function of the molecular mass of the substance. B) Remain unchanged. C) Increase two fold. D) Decrease twice. Show Answer Correct Answer: B) Remain unchanged. 7. A solution that can hold more solute is called A) Saturated. B) Supersaturated. C) Unsaturated. D) Insoluble. Show Answer Correct Answer: C) Unsaturated. 8. N=4, l=3? A) 4f. B) 4d. C) 3s. D) 3p. Show Answer Correct Answer: A) 4f. 9. Number of atoms in 52 g of He are: A) 2.865 X 10$^{23}$. B) 7.83 X 10$^{24}$. C) 6.023 X 10$^{23}$. D) 5000. Show Answer Correct Answer: B) 7.83 X 10$^{24}$. 10. If I am in group 17 how many valence electrons do I have? A) 17. B) 1. C) 7. D) None, I am a noble gase. Show Answer Correct Answer: C) 7. 11. Protons + ..... = atomic mass A) Electrons. B) Neutrons. C) Neither. D) None of the above. Show Answer Correct Answer: B) Neutrons. 12. A compound contains 4.07% H, 24.27% C, 71.65% Cl and has a molar mass of 98.96 g/mol. Its molecular formula is: A) CHCl. B) C2H4Cl2. C) CH2Cl2. D) C2H2Cl. Show Answer Correct Answer: B) C2H4Cl2. 13. Pure substance is classified further into A) Elements and mixture. B) Mixture and compound. C) Elements and compounds. D) None of the above. Show Answer Correct Answer: C) Elements and compounds. 14. Which homolgous series contains a C=C double bond? A) Alkanes. B) Alkenes. C) Alcohols. D) Carboxylic acids. Show Answer Correct Answer: B) Alkenes. 15. What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per500 mL? A) 4. B) 20. C) 0.2. D) 2. Show Answer Correct Answer: C) 0.2. 16. N x mass(m) = molar mass A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 17. At what temperature will both the Celcius and Fahrenheit scales read the same value? A) 40 $^\circ$C. B) 45$^\circ$F. C) -40$^\circ$C. D) -40$^\circ$. Show Answer Correct Answer: D) -40$^\circ$. 18. What is the mass number defined as? A) The number of protons. B) The number of protons and neutrons. C) The number of neutrons. D) The number of protons and electrons. Show Answer Correct Answer: B) The number of protons and neutrons. 19. Which has more molecules? A) 1 mole H$_{2}$O. B) 1 mole Al(OH)$_{3}$. C) 1 mole NaCl. D) There are all the same. Show Answer Correct Answer: D) There are all the same. 20. All the elements on the left side of the periodic table are called ..... A) Metals. B) Metalloid. C) Nonmetals. D) None of the above. Show Answer Correct Answer: A) Metals. 21. How many elements are there in the periodic table? A) 101. B) 108. C) 100. D) 118. Show Answer Correct Answer: D) 118. 22. What mass of CaCO3 reacts completely with 25 mL of 0.75 M HCl? A) 1.57 g. B) 2.36 g. C) 3.12 g. D) 4.53 g. Show Answer Correct Answer: A) 1.57 g. 23. Number of atoms in the following samples of substances is the largest in A) 127.0g of iodine. B) 48.0g of magnesium. C) 71.0g of chlorine. D) 4.0g of hydrogen. Show Answer Correct Answer: D) 4.0g of hydrogen. 24. When performing addition or subtraction, the result should be reported based on: A) The number with the least significant figures. B) The number with the fewest decimal places. C) The number with the largest integer digits. D) The total number of digits from all numbers added. Show Answer Correct Answer: B) The number with the fewest decimal places. 25. What is the valency for Zincate radical? A) 3+. B) 4+. C) 2+. D) 1-. Show Answer Correct Answer: C) 2+. ← PreviousNext →Related QuizzesClass 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 1Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 2Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 3Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 4Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 5Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 6Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 7Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 8Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 9Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books