This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part I > Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Sulphur shows valencies A) 2. B) 4. C) Both. D) None of the above. Show Answer Correct Answer: C) Both. 2. Smallest indivisible part of matter is? A) Atom. B) Compound. C) Molecule. D) Element. Show Answer Correct Answer: A) Atom. 3. The smallest part of an element which can participate in a chemical reaction is A) Elements. B) Molecules. C) Atoms. D) Ions. Show Answer Correct Answer: C) Atoms. 4. Calculate molarity if mole fraction of ethanol is 0.040, assuming water density 1 g/mL: A) 4.0 M. B) 2.2 M. C) 3.3 M. D) 1.0 M. Show Answer Correct Answer: B) 2.2 M. 5. H is a chemical name for ..... A) Helium. B) Hydrogen. C) Potassium. D) None of the above. Show Answer Correct Answer: B) Hydrogen. 6. 12 g of C$^{12 }$atom A) Avagadros nommber of atom. B) 1 gram atom. C) 1 mole. D) All of these. Show Answer Correct Answer: D) All of these. 7. Formula masses & "formula units" are used when referring to ..... and molecular masses & "molecules" are used when referring to ..... A) Covalently-bonded compounds atoms. B) Ionic compounds covalently-bonded compounds. C) Covalently-bonded compounds ionic compounds. D) Atoms ionic compounds. Show Answer Correct Answer: B) Ionic compounds covalently-bonded compounds. 8. Kerosene oil and NaCl solution results in A) Homogenous mixture. B) Heterogenous mixture. C) Pure substances. D) None of these are correct. Show Answer Correct Answer: B) Heterogenous mixture. 9. The atom with the largest atomic radius in Group 18 is- A) Kr. B) Ar. C) He. D) Rn. Show Answer Correct Answer: D) Rn. 10. If measurements are close to each other but not close to the true value, the measurements are considered: A) Accurate but not precise. B) Precise but not accurate. C) Neither accurate nor precise. D) Both accurate and precise. Show Answer Correct Answer: B) Precise but not accurate. 11. A 100 mL solution of CH3CH2MgBr on treatment with methanol produces 2.24 mL of a gas at STP. The weight of gas produced is ..... mg A) 2. B) 4. C) 3. D) 1. Show Answer Correct Answer: C) 3. 12. The law illustrated by the given mass ratios of dinitrogen and dioxygen reacting to form compounds is: A) Law of Definite Proportions. B) Law of Multiple Proportions. C) Law of Conservation of Mass. D) Gay Lussac's Law of Gaseous Volumes. Show Answer Correct Answer: B) Law of Multiple Proportions. 13. Determine the number of moles of Na$_{2}$CrO$_{4}$ that contain 4.33 x 10$^{24}$ oxygen atoms. A) 6.77 mol. B) 1.80 mol. C) 7.19 mol. D) 64.00 mol. Show Answer Correct Answer: B) 1.80 mol. 14. The element that its electronic configuration 1s$^{2}$ is located in A) S block. B) P block. C) F block. D) D block. Show Answer Correct Answer: B) P block. 15. 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. 16. A compound contains 4.07% hydrogen, 24.27% carbon and 71.65% chlorine. Its molecular mass is 98.96. Its empirical formula IS: A) CHCl. B) C$_{2}$H$_{2}$Cl$_{2}$. C) CH$_{2}$Cl. D) CHCl$_{2}$. Show Answer Correct Answer: C) CH$_{2}$Cl. 17. 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. 18. SI unit of pressure is A) Bar. B) Atm. C) Pa. D) Mm of Hg. Show Answer Correct Answer: C) Pa. 19. ..... are dependent on the amount of substance present, such as mass, length, or volume. A) Chemical properties. B) Intensive properties. C) Physical properties. D) Extensive properties. Show Answer Correct Answer: D) Extensive properties. 20. 32 amu is the molecular mass of A) NaOH. B) O$_{2}$. C) HBr. D) SO$_{2}$. Show Answer Correct Answer: B) O$_{2}$. 21. If you have 2 grams of helium gas at standard temperature & pressure, then you DON'T have A) A 1/2 mole helium. B) 6.02 x 10$^{23}$ atoms of helium. C) 3.01 x 10$^{23}$ atoms of helium. D) 11.2 L of helium. Show Answer Correct Answer: B) 6.02 x 10$^{23}$ atoms of helium. 22. 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. 23. What holds atoms, molecules, and compounds together? A) Electromagnetism. B) Electricity. C) Magnetism. D) Chemical Bonds. Show Answer Correct Answer: D) Chemical Bonds. 24. ..... 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$^{12}$. 25. 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. 26. Atomic mass of chlorinesis 35.5. It has two isotopes of atomic mass 35 and 37. The percentage of heavier isotope is: A) 20. B) 15. C) 10. D) 25. Show Answer Correct Answer: D) 25. 27. 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. 28. Valency of chloride ion is A) 0. B) 2. C) -1. D) +1. Show Answer Correct Answer: C) -1. 29. 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 %. 30. 250+3.01The correct answer is A) 13.50. B) 13.4. C) 13.4603. D) 13.5. Show Answer Correct Answer: D) 13.5. 31. What is an example of an Intensive property? A) Density. B) Volume. C) Weight. D) Shape. Show Answer Correct Answer: A) Density. 32. 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. 33. Which one is strongest acid among following options? A) B) CH2ClCOOH. B) (d) CHF2COOH. C) (c) CHCl2COOH. D) (a) CH2FCOOH. Show Answer Correct Answer: B) (d) CHF2COOH. 34. How many moles of NaCl are present in 250 cm3 of a 0.500 M NaCl solution? A) 0.125 mole. B) 0.10 mole. C) 0.15 mole. D) 0.05 mole. Show Answer Correct Answer: A) 0.125 mole. 35. Law of definite proportions states that equal volumes of all gases under similar conditions of pressure and temperature contain equal number of molecules. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 36. What does the ATOMIC MASS tell us about an atom? A) Protons + Neutrons. B) Protons + Electrons. C) Neutrons + Electrons. D) None of the above. Show Answer Correct Answer: A) Protons + Neutrons. 37. What is the smallest 'building block' of the elements that make up the universe? A) A proton. B) A cell. C) An electron. D) An atom. Show Answer Correct Answer: D) An atom. 38. Which of the following contains more molecules A) CO$_{2}$. B) H$_{2}$. C) N$_{2 }$. D) CH$_{4}$. Show Answer Correct Answer: B) H$_{2}$. 39. Number of atoms in 84 amu of He is A) 21. B) 11. C) 43. D) 22. Show Answer Correct Answer: A) 21. 40. Who was not a french chemist among the following? A) Gay lussac. B) Antoine Laviosier. C) Avagadro. D) Joseph Proust. E) John Dalton. Show Answer Correct Answer: E) John Dalton. 41. 23+1.020Find the correct answer A) 6.40. B) 6.4. C) 7.00. D) 6.401. Show Answer Correct Answer: A) 6.40. 42. SI unit of volume is A) M$^{3}$. B) Dm$^{3}$. C) Cm$^{3}$. D) Cc. Show Answer Correct Answer: A) M$^{3}$. 43. Oxidation is ..... A) Addition of oxygen and removal of hydrogen. B) Addition of hydrogen and removal of oxygen. C) All the above. D) None of the above. Show Answer Correct Answer: A) Addition of oxygen and removal of hydrogen. 44. If 10$^{21}$ molecules are removed from 200 mg of CO$_{2}$, then the number of moles of CO$_{2 }$left are A) 1.66 x 10$^{-3}$. B) 2.88 x 10$^{-3}$. C) 4.54 x 10$^{-3}$. D) 1.66 x 10$^{-3}$. Show Answer Correct Answer: B) 2.88 x 10$^{-3}$. 45. Mass percent of phosphorus in calcium phosphate is A) 38.71%. B) 20%. C) 28%. D) 41.29%. Show Answer Correct Answer: B) 20%. 46. When CO$_{2}$ (g) is passed over red hot coke it partially gets reduced to CO(g). Upon passing 0.5 litre of CO$_{2}$ (g) over red hot coke, the total volume of the gases increased to 700 mL. The composition of the gaseous mixture at STP is: A) (3) CO$_{2}$ = 0.0 mL:CO = 700mL. B) 1) CO$_{2}$ = 200 mL:CO = 500mL. C) (2) CO$_{2}$ = 350 mL:CO = 350mL. D) (4) CO$_{2}$ = 300 mL:CO = 400mL. Show Answer Correct Answer: D) (4) CO$_{2}$ = 300 mL:CO = 400mL. 47. Lead Sulphate+Ammonium Hydroxide $\rightarrow$ Ammonium sulphate +Lead hydroxide.Choose the correct Chemical equation for the above mentioned word equation. A) PbSO$_{4 }$+ NH$_{4}$OH $\rightarrow$ NH$_{4}$(SO$_{4}$)$_{2}$ + Pb(OH)$_{2}$. B) PbSo$_{4}$ + Nh$_{4}$OH $\rightarrow$ NH$_{4}$SO$_{4}$ + Pb(OH)$_{2}$. C) PBSO4 + NH$_{4OH }$$\rightarrow$ NH$_{4}$SO$_{4 }$+ PB(OH)$_{2}$. D) PbSO$_{4}$ + NH$_{4}$OH $\rightarrow$ (NH$_{4}$)$_{2}$SO$_{4}$ + Pb(OH)$_{2}$. Show Answer Correct Answer: D) PbSO$_{4}$ + NH$_{4}$OH $\rightarrow$ (NH$_{4}$)$_{2}$SO$_{4}$ + Pb(OH)$_{2}$. 48. If the molecular formula for compound Z is C$_{8}$H$_{18}$. What is the empirical formula? A) C$_{8}$H$_{18}$. B) C$_{4}$H$_{9}$. C) C$_{4}$H$_{8}$. D) CH$_{9}$. Show Answer Correct Answer: B) C$_{4}$H$_{9}$. 49. Mass of 1 atom is known as A) Atomic mass. B) Molecular mass. C) Molar mass. D) None of the above. Show Answer Correct Answer: A) Atomic mass. 50. How many gram is 0.5 mol of Copper atoms? (Cu:63, 5g/mol) A) 31, 75 g. B) 63, 5 g. C) 3, 175 g. D) 6, 35 g. Show Answer Correct Answer: A) 31, 75 g. 51. For preparing M/ 10 solution of H2SO4 in one litre we need H2SO4: A) 4.8 g. B) 0.09 g. C) 49.0 g. D) 9.8 g. Show Answer Correct Answer: D) 9.8 g. 52. Molar mass carbondioxide A) 46. B) 45. C) 43. D) 44. Show Answer Correct Answer: D) 44. 53. A compound was found to contain nitrogen and oxygen in the ratio, nitrogen 28 g and 80 g of oxygen. The formula of the compound is: A) NO. B) N2O3. C) N2O5. D) N2O4. Show Answer Correct Answer: C) N2O5. 54. Matter plays a major role in chemistry . What are the two classifications of matter? A) Preparational and physical. B) Compositional and chemistry. C) Preparational and compositional. D) Physical and chemical. Show Answer Correct Answer: D) Physical and chemical. 55. Which of the following weighs least?one gram-atom of nitrogen, one mole of calcium, one mole of oxygen molecules. A) One gram-atom of nitrogen. B) One mole of calcium. C) One mole of oxygen molecules. D) All of the above. Show Answer Correct Answer: A) One gram-atom of nitrogen. 56. There is a uniform composition of substance in ..... mixture A) HETEROGENOUS. B) HOMOGENOUS. C) All the above. D) None of the above. Show Answer Correct Answer: B) HOMOGENOUS. 57. Given, that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is A) 55.95. B) 55.85. C) 56.05. D) 55.75. Show Answer Correct Answer: B) 55.85. 58. In Avogadro's law volume is directly proportional to ..... A) Temperature. B) Volume. C) Pressure. D) Number of moles. Show Answer Correct Answer: D) Number of moles. 59. The concentration of solution containing 0.5 mole H3PO4 dissolved in 500 g water: A) 1 N. B) 1 m. C) 0.5 M. D) 1 M. Show Answer Correct Answer: D) 1 M. 60. How many significant figures are there? 9009.00 A) 4. B) 6. C) 5. D) 2. Show Answer Correct Answer: B) 6. ← PreviousNext →Related QuizzesScience QuizzesClass 11 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books