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 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 8 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Number of atoms in 52 moles of Ar is: A) $3.13 \times 10^{22}$. B) $3.13 \times 10^{24}$. C) $3.13 \times 10^{25}$. D) $3.13 \times 10^{23}$. Show Answer Correct Answer: C) $3.13 \times 10^{25}$. 2. A solution is 25% water, 25% ethanol and 50% acetic acid by mass. The mole fraction of water is: A) 0.856. B) 0.99. C) 0.6. D) 0.502. Show Answer Correct Answer: D) 0.502. 3. In SI units, the atomic mass unit is represented by the symbol A) (a) g. B) (b) kg. C) C) u. D) (d) all of these. Show Answer Correct Answer: C) C) u. 4. In a hydrogen atom, if the energy of an electron in the ground state is 13.6 eV, then that in the 2nd excited state is A) 13.6 eV. B) 6.04 eV. C) 1.51 eV. D) 3.4 eV. Show Answer Correct Answer: C) 1.51 eV. 5. Identify the number of Chlorine atoms in 65.8 g CaCl$_{2.}$ A) 7.14 x 10$^{23}$ atoms. B) 1.22 x 10$^{23}$ atoms. C) 3.57 x 10$^{23}$ atoms. D) 8.71 x 10$^{23}$ atoms. Show Answer Correct Answer: A) 7.14 x 10$^{23}$ atoms. 6. The SI unit of mass is the: A) Pound. B) Gram. C) Kilogram. D) Newton. Show Answer Correct Answer: C) Kilogram. 7. Highly reactive metal among the metals in the periodic table A) Sodium. B) Potassium. C) Hydrogen. D) Nickel. Show Answer Correct Answer: A) Sodium. 8. For aq sol, which is true A) 1m is more concentrated than 1M. B) Data insufficient. C) 1m=1M. D) 1m is less concentrated than 1M. Show Answer Correct Answer: D) 1m is less concentrated than 1M. 9. Which of the following element contains the greatest number of atoms? A) 0.4g Ca. B) 46g Na. C) 4g He. D) 12g He. Show Answer Correct Answer: D) 12g He. 10. How much sodium acetate is needed to prepare 500 mL of 0.375 M solution? A) 15.38 g. B) 19.6 g. C) 18.2 g. D) 20.4 g. Show Answer Correct Answer: A) 15.38 g. 11. Matter in a ..... has a ..... volume and ..... shape A) Gaseous state no definite no definite. B) Liquid state no definite definite. C) A. solid state no definite no definite. D) None of the above. Show Answer Correct Answer: A) Gaseous state no definite no definite. 12. What term is given to a compound which contains atoms of carbon and hydrogen only? A) Saturated. B) Alkane. C) Alkene. D) Hydrocarbon. Show Answer Correct Answer: D) Hydrocarbon. 13. Find the molecular mass of $BeCl_2$ A) 80 u. B) 79u. C) 80.5. D) 78 u. Show Answer Correct Answer: A) 80 u. 14. The element with the smallest ionization energy in Period 6 is- A) Tm. B) Rn. C) Os. D) Cs. Show Answer Correct Answer: D) Cs. 15. What name is given to the number of atoms in a mole of an element? A) Planck's constant. B) Avogadro's constant. C) Newtonian constant. D) None of the above. Show Answer Correct Answer: B) Avogadro's constant. 16. How many moles of NaCl are present in a solution with a molarity of 8.59M and 125 mL of solution? A) 62.7 mol. B) 1.07 gram. C) 62.7 grams. D) 1.07 mol. Show Answer Correct Answer: D) 1.07 mol. 17. When 1 mole of carbon is burnt in air, carbon dioxide produced is: A) 44 g. B) 11 g. C) 88 g. D) 22 g. Show Answer Correct Answer: A) 44 g. 18. Ferric chloride is A) Fe$_{2}$Cl$_{3}$. B) FeCl$_{4}$. C) FeCl$_{2}$. D) FeCl$_{3}$. Show Answer Correct Answer: D) FeCl$_{3}$. 19. ..... are any substances that are able to dissolve another substance. A) Organic. B) Magical. C) Potion. D) Solvents. Show Answer Correct Answer: D) Solvents. 20. How many grams of AgNO$_{3}$ are needed to prepare 0.125 M solution in 250 mL of water? (M$_{r}$ =169.87 g mol$^{-1}$) A) 84.9 g. B) 5.3 g. C) 0.03 g. D) 0.5 g. Show Answer Correct Answer: B) 5.3 g. 21. Measurement which is close to true value is called as ..... A) Average. B) Precise. C) Accurate. D) Exact. Show Answer Correct Answer: C) Accurate. 22. The balancing of chemical equations is based upon A) Law of definite proportions. B) Law of conservation of mass. C) Law of multiple proportions. D) Law of combining volumes. Show Answer Correct Answer: B) Law of conservation of mass. 23. Mass of 1 molecule is known as A) Atomic mass. B) Molecular mass. C) Molar mass. D) None of the above. Show Answer Correct Answer: B) Molecular mass. 24. The law of multiple proportions is illustrated by A) Carbon monoxide and carbon dioxide. B) Potassium bromide and potassium chloride. C) Water and heavy water. D) Calcium hydroxide and barium hydroxide. Show Answer Correct Answer: B) Potassium bromide and potassium chloride. 25. The no of molecules in 22.4 cm$^{3}$ of nitrogen gas at STP is A) $22.4\times10^{20}$. B) $6.022\times10^{20}$. C) $6.022\times10^{23}$. D) $22.4\times10^{23}$. Show Answer Correct Answer: B) $6.022\times10^{20}$. 26. Which of the following is used to measure mass accurately? A) Barometer. B) Massometer. C) Analytical balance. D) Thermometer. Show Answer Correct Answer: C) Analytical balance. 27. According to the Law of Conservation of Mass: A) Mass is destroyed during combustion. B) Mass remains constant during a chemical reaction. C) Mass changes depending on temperature. D) Mass can be created during a chemical reaction. Show Answer Correct Answer: B) Mass remains constant during a chemical reaction. 28. Volume occupied by 1 mole of any gaseous substance at 273 K and 1 bar pressure is ..... A) 22.71 litres. B) 22.4 litres. C) 24.5 litres. D) None of the above. Show Answer Correct Answer: A) 22.71 litres. 29. Brass is a copper-zinc alloy. If the concentration of zinc is relatively low, the brass has a golden color and is often used for inexpensive jewelry. If a 35.0g pendant contains 1.7g of zinc, what is the % by mass of zinc in brass? A) 10%. B) 4.7%. C) 4.8%. D) 4.9%. Show Answer Correct Answer: D) 4.9%. 30. G of dibasic acid required 100 mL of 0.1 N NaOH for complete neutralization. The equivalent weight of acid is: A) 156. B) 26. C) 52. D) 104. Show Answer Correct Answer: C) 52. 31. 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$_{3}$OH. B) CH$_{4}$. C) HCHO. D) C$_{6}$H$_{12}$O$_{6}$. Show Answer Correct Answer: D) C$_{6}$H$_{12}$O$_{6}$. 32. Oxidation no. of hydrogen is ..... A) 0. B) +1. C) -1. D) None of the above. Show Answer Correct Answer: B) +1. 33. 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. 34. Functional group of amine is A) CHO. B) COOH. C) -CONH2. D) 2. E) -NH2. Show Answer Correct Answer: E) -NH2. 35. What is the number of moles in 222.0 g of Ca(OH)$_{2}$ A) 3 moles. B) 5 moles. C) 4 moles. D) 2 moles. Show Answer Correct Answer: A) 3 moles. 36. 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) Increase two fold. B) Remain unchanged. C) Decrease twice. D) Be a function of the molecular mass of the substance. Show Answer Correct Answer: B) Remain unchanged. 37. A solution that can hold more solute is called A) Insoluble. B) Unsaturated. C) Supersaturated. D) Saturated. Show Answer Correct Answer: B) Unsaturated. 38. Number of atoms in 52 g of He are: A) 5000. B) 2.865 X 10$^{23}$. C) 7.83 X 10$^{24}$. D) 6.023 X 10$^{23}$. Show Answer Correct Answer: C) 7.83 X 10$^{24}$. 39. 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. 40. Protons + ..... = atomic mass A) Electrons. B) Neutrons. C) Neither. D) None of the above. Show Answer Correct Answer: B) Neutrons. 41. 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) C2H2Cl. B) CH2Cl2. C) CHCl. D) C2H4Cl2. Show Answer Correct Answer: D) C2H4Cl2. 42. 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. 43. Which homolgous series contains a C=C double bond? A) Alkenes. B) Alcohols. C) Alkanes. D) Carboxylic acids. Show Answer Correct Answer: A) Alkenes. 44. What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per500 mL? A) 2. B) 20. C) 0.2. D) 4. Show Answer Correct Answer: C) 0.2. 45. 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. 46. At what temperature will both the Celcius and Fahrenheit scales read the same value? A) -40$^\circ$. B) 40 $^\circ$C. C) -40$^\circ$C. D) 45$^\circ$F. Show Answer Correct Answer: A) -40$^\circ$. 47. 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. 48. 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. 49. 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. 50. How many elements are there in the periodic table? A) 108. B) 100. C) 101. D) 118. Show Answer Correct Answer: D) 118. 51. What mass of CaCO3 reacts completely with 25 mL of 0.75 M HCl? A) 1.57 g. B) 2.36 g. C) 4.53 g. D) 3.12 g. Show Answer Correct Answer: A) 1.57 g. 52. Number of atoms in the following samples of substances is the largest in A) 71.0g of chlorine. B) 48.0g of magnesium. C) 4.0g of hydrogen. D) 127.0g of iodine. Show Answer Correct Answer: C) 4.0g of hydrogen. 53. 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. 54. What is the valency for Zincate radical? A) 1-. B) 3+. C) 4+. D) 2+. Show Answer Correct Answer: D) 2+. 55. How many of the following are elements?O$_{2}$, HCl, PF$_{3}$, H$_{2}$, O$_{3}$, BeCl$_{2}$, I$_{2}$, C, AlCl$_{3, }$SF$_{4}$ A) 5. B) 10. C) 8. D) 4. Show Answer Correct Answer: D) 4. 56. Significant figures refer to: A) All digits in a number. B) Digits that carry meaning contributing to precision of measurement. C) Digits before the decimal point only. D) Digits after the decimal point only. Show Answer Correct Answer: B) Digits that carry meaning contributing to precision of measurement. 57. How many moles are 98.3 grams of aluminum hydroxide, Al(OH)$_{3}$? A) 0.8 moles. B) 150 moles. C) 1.26 moles. D) 7, 673.4 moles. Show Answer Correct Answer: C) 1.26 moles. 58. Which of the following sets of quantum numbers is correct for an electron present in 4f orbital? A) N = 4, l = 3, m = +1, s = +1/2. B) N = 4, l = 4, m =-4, s =-1/2. C) N = 4, l = 3, m = +4, s = +1/2. D) N = 3, l = 2, m =-2, s = +1/2. Show Answer Correct Answer: A) N = 4, l = 3, m = +1, s = +1/2. 59. WHICH OF THE FOLLOWING IS NOT EQUAL TO ONE METRE? A) 10$^{6}$$\mu$m. B) 10$^{9}$pm. C) 10$^{15}$fm. D) 10$^{3}$mm. Show Answer Correct Answer: B) 10$^{9}$pm. 60. On the basis of chemical classification the matter is classified as A) Homogenous and heterogenous. B) Mixture and pure substances. C) Elements and compounds. D) None of the above are correct. Show Answer Correct Answer: B) Mixture and pure substances. ← 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books