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 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 6 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An empirical formula represents A) The simplest whole number ratio of various atoms present in a compound. B) The exact number of different types of atoms present in a molecule of a compound. C) All the above. D) None of the above. Show Answer Correct Answer: A) The simplest whole number ratio of various atoms present in a compound. 2. What is the unit of mole fraction A) Gram. B) Mol/L. C) Unitless. D) Mole. Show Answer Correct Answer: C) Unitless. 3. 18 g of water is A) 1 mol. B) 3 mol. C) 0.5 mol. D) 2 mol. Show Answer Correct Answer: A) 1 mol. 4. 1 gram-atom of oxygen is A) 22.4 gms of oxygen. B) 1 gm of oxygen. C) 16 g of oxygen. D) 8 g of oxygen. Show Answer Correct Answer: C) 16 g of oxygen. 5. Atomic mass of neon A) 20.18. B) 10.81. C) 14.4. D) All are wrong. Show Answer Correct Answer: A) 20.18. 6. How many moles are there in 9 g of water? A) 2. B) 1. C) 0.5. D) None of the above. Show Answer Correct Answer: C) 0.5. 7. Which metal is in the liquid state at room temperature? A) Iodine. B) Hydrogen. C) Mercury. D) Carbon. Show Answer Correct Answer: C) Mercury. 8. 2 KClO$_{3}$ $\rightarrow$ 2 KCl + 3 O$_{2}$ How many moles of oxygen are produced when 6.7 moles of KClO$_{3}$ decompose completely? A) 10.1 mol. B) 6.7 mol. C) 4.5 mol. D) 1.0 mol. Show Answer Correct Answer: A) 10.1 mol. 9. XCO + yO$_{2}$ gives zCO$_{2}$$_{x, y and z are}$ A) 1, 4, 1. B) 2, 2, 1. C) 2, 1, 2. D) 1, 2, 2. Show Answer Correct Answer: C) 2, 1, 2. 10. Which are the people who prescribe medicines A) Pharmacists. B) Doctors. C) None. D) None of the above. Show Answer Correct Answer: B) Doctors. 11. How many grams of Na$_{2}$CO$_{3}$ should be dissolved to make 100 cm$^{3}$ of 0.15 M Na$_{2}$CO$_{3}$ solution? A) 4.32 g. B) 2.80g. C) 3.6 g. D) 1.59 g. Show Answer Correct Answer: D) 1.59 g. 12. Atoms of the same element that have different masses are called A) Neutrons. B) Nuclides. C) Moles. D) Isotopes. Show Answer Correct Answer: D) Isotopes. 13. What is the mass of 4.5 moles of water? A) 85.6 g. B) 24.5 g. C) 68.5 g. D) 81.0 g. Show Answer Correct Answer: D) 81.0 g. 14. G of CaCO3 is treated with 1 L of 1 N HCI. What would be the weight of CO2 liberated after the completion of the reaction? A) 22 g. B) 55 g. C) 11 g. D) 33 g. Show Answer Correct Answer: B) 55 g. 15. Solvent is best defined as- A) A mixture in which the substances are spread out evenly between one another and cannot be told apart. B) The ability of a substance to dissolve in another substance. C) A substance that dissolves in another substance. D) A substance into which another substance dissolves. Show Answer Correct Answer: D) A substance into which another substance dissolves. 16. Kg of N$_{2}$ (g) and 10.0 kg of H$_{2}$ (g) are mixed to produce NH$_{3}$ (g). The limiting reagent in this reaction is: A) H$_{2}$. B) N$_{2}$. C) H. D) N. Show Answer Correct Answer: A) H$_{2}$. 17. Number of moles of CO$_{2 }$present in 22.0g of carbondioxide is A) 0.5. B) 2. C) 22. D) 0.25. Show Answer Correct Answer: A) 0.5. 18. No of alpha hydrogen atom in CH3-CH2+ is A) 2. B) 3. C) 3. D) 4. E) 1. Show Answer Correct Answer: B) 3. 19. What volume of 0.250 M HCl (aq) is required to react completely with 22.6 g of sodium carbonate according to the reaction:Na$_{2}$CO$_{3}$ (s) + 2HCl (aq) $\rightarrow$ 2NaCl (aq) + H$_{2}$O + CO$_{2}$ A) 1802 ml. B) 1704 ml. C) 2600 ml. D) 1000 ml. Show Answer Correct Answer: B) 1704 ml. 20. Elements having same atomic number but different atomic mass number is A) Isotones. B) Isotopes. C) Isodiapheres. D) Isobars. Show Answer Correct Answer: B) Isotopes. 21. Acidified potassium dichromate is an example of ..... A) A reducing agent. B) A fuel. C) An oxidising agent. D) An alkali. Show Answer Correct Answer: C) An oxidising agent. 22. N x 22.4 litres = volume A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 23. Given the following:42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula. A) NaPO$_{4}$. B) Na$_{3}$PO$_{4}$. C) Na$_{2}$PO$_{3}$. D) NaPO$_{2}$. Show Answer Correct Answer: B) Na$_{3}$PO$_{4}$. 24. What term describes alkane molecules that contain C-C single bonds? A) Saturated. B) Unsaturated. C) All the above. D) None of the above. Show Answer Correct Answer: A) Saturated. 25. HNO$_{3}$ is called as A) Nitrous acid. B) Nitric acid. C) Ammonia. D) Hydrazoic acid. Show Answer Correct Answer: B) Nitric acid. 26. The correct electronic configuration of Cr (Z=24) is A) [Ar] 3d$^{ 9}$ 4s 2. B) [Ar] 3d$^{ 10}$ 4s $^{1}$. C) [Ar] 3d$^{ 5}$ 4s $^{1}$. D) [Ar] 3d$^{ 4}$ 4s 2. Show Answer Correct Answer: C) [Ar] 3d$^{ 5}$ 4s $^{1}$. 27. Which of the following sub levels does not exist A) 2p. B) 5f. C) 4f. D) 3d. E) 2d. Show Answer Correct Answer: E) 2d. 28. Limiting reagent A) Catalyses a chemical reaction. B) Stops a chemical reaction. C) Speeds up a chemical reaction. D) Does not impact a chemical reaction. Show Answer Correct Answer: B) Stops a chemical reaction. 29. Molecular mass of methane is A) 18u. B) 16u. C) 20u. D) None of the above. Show Answer Correct Answer: B) 16u. 30. What is the molecular formula of Lactic acid ( Empirical formula CH$_{2}$O ) if n=3, A) CH$_{2}$O. B) C$_{4}$H$_{6}$O$_{6}$. C) C$_{3}$H$_{6}$O$_{3}$. D) None of the above. Show Answer Correct Answer: C) C$_{3}$H$_{6}$O$_{3}$. 31. The representation for sulphate ion is A) SO42-. B) SO3-. C) SU2-. D) All. Show Answer Correct Answer: A) SO42-. 32. The weight of carbon monoxide having same number of oxygen atoms as are present in 88 g of carbon dioxide are: A) 32 g. B) 44 g. C) 12 g. D) 112 g. Show Answer Correct Answer: D) 112 g. 33. Which kind of mixture is air? A) HOMOGENOUS. B) HETEROGENOUS. C) None of the above. D) All of the above. Show Answer Correct Answer: A) HOMOGENOUS. 34. 1mole of O$_{2}$ gas A) 32 g of oxygen. B) 22.4 L of oxygen. C) N$_{A }$number of molecules. D) All of these. Show Answer Correct Answer: D) All of these. 35. Mole of carbohydrate of empirical formula CH$_{2}$O contain 1 g of hydrogen. The molecular formula of the carbohydrate is A) C$_{3}$H$_{4}$O$_{3}$. B) C$_{5}$H$_{10}$O$_{5}$. C) C$_{12}$H$_{22}$O$_{11}$. D) C$_{6}$H$_{12}$O$_{6}$. Show Answer Correct Answer: D) C$_{6}$H$_{12}$O$_{6}$. 36. Which of the following is not possible? A) N=3, l=2, m=0. B) N=4, l=3, m=-3. C) N=3, l=3, m=2. D) N=1, l=0, m=0. Show Answer Correct Answer: C) N=3, l=3, m=2. 37. Electronegativity ..... from left to right within a period and ..... from top to bottom within a group. A) Stays the same, increases. B) Increases, decreases. C) Increases, increases. D) Decreases, increases. Show Answer Correct Answer: B) Increases, decreases. 38. General formula for alkyne is ..... A) C$_{n}$H$_{2n}$. B) C$_{n}$H$_{2n-2}$. C) C$_{n}$H$_{2n+2}$. D) C$_{n}$H$_{2n+1}$. Show Answer Correct Answer: B) C$_{n}$H$_{2n-2}$. 39. A neutral species that has an unpaired electron is called a ..... A) Nucleophile. B) Electrophile. C) Free radical. D) Carbanion. Show Answer Correct Answer: C) Free radical. 40. Molecular formula for the oxide of calcium is A) CaO. B) Ca2O. C) None. D) None of the above. Show Answer Correct Answer: A) CaO. 41. A contaminated water sample has 15 ppm chloroform (CHCl3). What is this in % by mass? A) 0.015%. B) 0.0015%. C) 1.5%. D) 0.15%. Show Answer Correct Answer: B) 0.0015%. 42. P$_{4 }$+ 3 O$_{2 }$$\rightarrow$ P$_{4}$O$_{6 }$What is the limiting reagent if 12 mol of P$_{4 }$react with 15 mol of O$_{2}$? A) P$_{4}$. B) O$_{2}$. C) P$_{4}$O$_{6 }$. D) None of the above. Show Answer Correct Answer: B) O$_{2}$. 43. How many of the following are NOT elements?H$_{2}$O, HCl, PF$_{3}$, H$_{2}$, O$_{3}$, BeCl$_{2}$, KI, C, AlCl$_{3, }$SF$_{4}$ A) 4. B) 10. C) 7. D) 8. Show Answer Correct Answer: D) 8. 44. What is a chemical property? A) How a chemical behaves by itself. B) Ability of a substance to form bonds with other substances. C) The size and shape of a chemical. D) How a substance feels or looks. Show Answer Correct Answer: B) Ability of a substance to form bonds with other substances. 45. Symbol of copper is A) Co. B) Cu. C) Ca. D) None of the above. Show Answer Correct Answer: B) Cu. 46. A(n) ..... is a pure substance made of a single type of atom and cannot be broken down. A) Element. B) Molecule. C) Compound. D) Mixture. Show Answer Correct Answer: A) Element. 47. Which is used to Express amount of mercury vapour in atmosphere A) M. B) Ppm. C) M. D) Mole fraction. Show Answer Correct Answer: B) Ppm. 48. The amount of 70% HNO$_{3}$ required to prepare 250 ml of 2.0 M HNO$_{3}$ is A) 70g. B) 90g. C) 31.5g. D) 45g. Show Answer Correct Answer: D) 45g. 49. Given isotope data, calculate molar mass of naturally occurring argon: A) 40.0 g/mol. B) 39.9 g/mol. C) 41.2 g/mol. D) 38.0 g/mol. Show Answer Correct Answer: B) 39.9 g/mol. 50. The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. This illustrate the law of A) Constant proportions. B) Multiple proportions. C) Reciprocal proportions. D) Conservation of mass. Show Answer Correct Answer: A) Constant proportions. 51. You need to make 200 mL of a 0.20 M aqueous solution of sodium chloride. The only available solution is 1.0 M. Determine how to make the needed dilution. A) Evaporate 160 mL from the initial volume. B) The experiment cannot be conducted with the materials provided. C) Add 160 grams of water to the initial solution. D) Add 160 mL of water to the initial solution. Show Answer Correct Answer: D) Add 160 mL of water to the initial solution. 52. Which science examines the structure of living organisms at the atomic level? A) Geology. B) Cytology. C) Zoology. D) Biochemistry. Show Answer Correct Answer: D) Biochemistry. 53. The volume of 400 g of gold ( density 19.3 g / cm3 ) will be A) 22.3. B) 20.3. C) 19.3. D) 15.3. Show Answer Correct Answer: B) 20.3. 54. The molality of a solution of methanol in water in which the mole fraction of methanol is 0.25 is ..... A) 14.7. B) 18.5. C) 12.6. D) 20.3. Show Answer Correct Answer: B) 18.5. 55. G of sodium hydroxide (molar mass = 40) is dissolved in water and the solution is made to 100 cm$^{3}$ in a volumetric flask. The molarity of the solution is: A) 0.04 M. B) 0.615 M. C) 3.14 M. D) 4.2 M. Show Answer Correct Answer: B) 0.615 M. 56. The volume of a steel ball if the diameter of 7.5mm is A) 442. B) 1768. C) 110. D) 221. Show Answer Correct Answer: D) 221. 57. MnO4-ions are reduced in acidic condition to Mn2+ ions whereas they are reduced in neutral condition to MnO2. The oxidation of 25 mL of a solution X containing Fe2+ ions required in acidic condition 20 mL of a solution Y containing MnO4-ions. What volume of solution Y would be required to oxidise 25 mL of a solution X containing Fe2+ ions in neutral condition? A) 12.0mL. B) 35.0 mL. C) 11.4 mL. D) 33.3 mL. Show Answer Correct Answer: D) 33.3 mL. 58. Name the property among the following that is affected by change in temperature A) Molarity. B) Molality. C) None of these are correct. D) Formality. Show Answer Correct Answer: A) Molarity. 59. Elements X and Y combine to form two compounds XY and X$_{2}$Y. Find the atomic weight of X and Y, if the weight of 0.1 moles of XY is 10g and 0.05 moles of X$_{2}$Y is 9g A) 80, 20. B) 20, 30. C) 30, 20. D) 60, 40. Show Answer Correct Answer: A) 80, 20. 60. The term used for substances which are formed as a result of chemical reaction A) Reactants. B) Products. C) Precipitate. D) Catalyst. Show Answer Correct Answer: B) Products. ← 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 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 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