This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Determine the number of moles of Na$_{2}$CrO$_{4}$ that contain 4.33 x 10$^{24}$ oxygen atoms. A) 7.19 mol. B) 6.77 mol. C) 1.80 mol. D) 64.00 mol. Show Answer Correct Answer: C) 1.80 mol. 2. The element that its electronic configuration 1s$^{2}$ is located in A) S block. B) P block. C) D block. D) F block. Show Answer Correct Answer: B) P block. 3. In which of the following p orbital of carbon atom have an odd electron pair . A) Carbocation. B) Carboanion. C) Free radicals. D) None of the above. Show Answer Correct Answer: C) Free radicals. 4. A compound contains 4.07% hydrogen, 24.27% carbon and 71.65% chlorine. Its molecular mass is 98.96. Its empirical formula IS: A) C$_{2}$H$_{2}$Cl$_{2}$. B) CHCl. C) CHCl$_{2}$. D) CH$_{2}$Cl. Show Answer Correct Answer: D) CH$_{2}$Cl. 5. What is the average molecular weight of a gas containing 20% of N$_{2}$ (molecular weight 28) and 80% of So$_{2}$ (molecular weight 64)? A) 52. B) 53. C) 50. D) NNone of these. Show Answer Correct Answer: C) 50. 6. SI unit of pressure is A) Pa. B) Atm. C) Bar. D) Mm of Hg. Show Answer Correct Answer: A) Pa. 7. ..... are dependent on the amount of substance present, such as mass, length, or volume. A) Intensive properties. B) Chemical properties. C) Physical properties. D) Extensive properties. Show Answer Correct Answer: D) Extensive properties. 8. 32 amu is the molecular mass of A) O$_{2}$. B) SO$_{2}$. C) NaOH. D) HBr. Show Answer Correct Answer: A) O$_{2}$. 9. If you have 2 grams of helium gas at standard temperature & pressure, then you DON'T have A) 6.02 x 10$^{23}$ atoms of helium. B) 3.01 x 10$^{23}$ atoms of helium. C) A 1/2 mole helium. D) 11.2 L of helium. Show Answer Correct Answer: A) 6.02 x 10$^{23}$ atoms of helium. 10. Atomic weight is defined as mass of one mole of an element A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. What holds atoms, molecules, and compounds together? A) Chemical Bonds. B) Electromagnetism. C) Magnetism. D) Electricity. Show Answer Correct Answer: A) Chemical Bonds. 12. ..... is considered as standard for atomic mass. A) $_{6}$C$^{12}$. B) $_{7}$C$^{12}$. C) $_{6}$C$^{13}$. D) None of the above. Show Answer Correct Answer: A) $_{6}$C$^{12}$. 13. The number of significant figures for the three numbers 161 cm, 0.161 cm, 0.0161 cm are A) 3, 4 and 5 respectively. B) 3, 4 and 4 respectively. C) 3, 3 and 4 respectively. D) 3, 3 and 3 respectively. Show Answer Correct Answer: D) 3, 3 and 3 respectively. 14. Molar mass is A) Mass of one molecule. B) Mass of one atom. C) Mass of one mole. D) 12 g. Show Answer Correct Answer: C) Mass of one mole. 15. For a given principal level n = 4, the energy of its subshells is in the order A) S < p < d < f. B) S > p > d > f. C) S < p < f < d. D) F < p < d < s. Show Answer Correct Answer: A) S < p < d < f. 16. Atomic mass of chlorinesis 35.5. It has two isotopes of atomic mass 35 and 37. The percentage of heavier isotope is: A) 10. B) 15. C) 20. D) 25. Show Answer Correct Answer: D) 25. 17. Mass of 1 atom in amu is known as A) Atomic mass. B) Molecular mass. C) Molar mass. D) None of the above. Show Answer Correct Answer: A) Atomic mass. 18. Valency of chloride ion is A) 0. B) +1. C) -1. D) 2. Show Answer Correct Answer: C) -1. 19. The mass percentage of iron in copper pyrites (CuFeS$_{2}$) is: A) 36.28 %. B) 34.91 %. C) 30.44 %. D) NONE OF THE ABOVE. Show Answer Correct Answer: C) 30.44 %. 20. Find the correct order of states of matter arranged in the order of their molecular force of attraction.G-GASS-SOLIDL-LIQUID A) G>S>L. B) S>G>L. C) G D) S Show Answer Correct Answer: C) G 21. 250+3.01The correct answer is A) 13.4603. B) 13.50. C) 13.4. D) 13.5. Show Answer Correct Answer: D) 13.5. 22. What is an example of an Intensive property? A) Volume. B) Shape. C) Density. D) Weight. Show Answer Correct Answer: C) Density. 23. What are the positively charged particles in an atom? A) Protons. B) Neutrons. C) Electrons. D) None of the above. Show Answer Correct Answer: A) Protons. 24. Which one is strongest acid among following options? A) (a) CH2FCOOH. B) B) CH2ClCOOH. C) (c) CHCl2COOH. D) (d) CHF2COOH. Show Answer Correct Answer: D) (d) CHF2COOH. 25. How many moles of NaCl are present in 250 cm3 of a 0.500 M NaCl solution? A) 0.15 mole. B) 0.125 mole. C) 0.10 mole. D) 0.05 mole. Show Answer Correct Answer: B) 0.125 mole. ← 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 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 10Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books