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 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The mass of one mole of a substance is known as the A) Chemical Mass. B) Chemical Equation. C) Molar Mass. D) Formula. Show Answer Correct Answer: C) Molar Mass. 2. G of urea on strong heating with NaOH evolves NH$_{3}$. Liberated NH$_{3}$ will combine with which of the following HCl solution? A) 200 mL of 0.2 N HCl. B) 400 mL of 0.2 N HCl. C) 100 mL of 0.1 N HCl. D) 100 mL of 0.2 N HCl. Show Answer Correct Answer: D) 100 mL of 0.2 N HCl. 3. If 6.3 g of NaHCO$_{3}$ is added to 15.0 g CH$_{3}$COOH solution, the residue is found to weigh 18.0 g. What is the mass of CO$_{2}$ released in the reaction? A) 2.6g. B) 2.8g. C) 4.5g. D) 3.3g. Show Answer Correct Answer: D) 3.3g. 4. An atom of calcium has 20 protons and 20 neutrons. What is its mass number? A) 80. B) 20. C) 40. D) 60. Show Answer Correct Answer: C) 40. 5. How many moles are in 3.01 x 10$^{22}$ atoms of magnesium? A) 1.81 x 10$^{46}$ moles. B) 0.0500 moles. C) 5.00 moles. D) 5.00 x 10$^{21}$ moles. Show Answer Correct Answer: B) 0.0500 moles. 6. What is the hybridisation and shape of alkyl carbocation? A) Sp$_{2}$ planner. B) Sp$_{2 }$pyramidal. C) Sp$_{3 }$planner. D) None of the above. Show Answer Correct Answer: A) Sp$_{2}$ planner. 7. New substances are always formed when matter undergoes a ..... A) Change in shape. B) Physical change. C) Chemical change. D) Change in temperture. Show Answer Correct Answer: C) Chemical change. 8. 2 CO (g) + O$_{2}$(g) $\rightarrow$ 2 CO$_{2}$ (g) In the formation of CO$_{2}$ from CO and oxygen, how many Liters of CO$_{2}$ are produced by the reaction of 8 mols of O$_{2}$ with an excess of carbon monoxide? A) 704 grams. B) 0.178 L. C) 0.36 grams. D) 358.4 Liters. Show Answer Correct Answer: D) 358.4 Liters. 9. Empirical formula of C$_{6}$H$_{12}$O$_{6}$ is A) C$_{6}$H$_{12}$O$_{6}$. B) CHO. C) CH$_{2}$O. D) C$_{3}$H$_{6}$O$_{3}$. Show Answer Correct Answer: C) CH$_{2}$O. 10. How many significant figures are there? 0.000008 A) 1. B) 2. C) 7. D) 6. Show Answer Correct Answer: A) 1. 11. A welding fuel gas contains carbon and hydrogen only. Burning a sample produces 3.38 g CO2 and 0.690 g H2O, total gas weighs 11.6 g in 10 L at STP. The empirical formula of the gas is: A) C2H2. B) CH4. C) C3H8. D) C2H6. Show Answer Correct Answer: A) C2H2. 12. G of pure calcium carbonate was found to require 50 mL of dilute HCl for complete reactions. The strength of the HCl solution is given by: A) 0.2 N. B) 0.4 N. C) 4 N. D) 2 N. Show Answer Correct Answer: B) 0.4 N. 13. The chemical name for Nitric oxide (NO) is: A) Nitrogen peroxide. B) Nitrogen Monoxide. C) Dinitrogen oxide. D) None of the above. Show Answer Correct Answer: B) Nitrogen Monoxide. 14. What is the definition for Avogadro's number? A) Whole number ratio that is a multiple of a chemical formula. B) Simplest, whole number ratio of a chemical formula. C) 6.02 x 10$^{23}$ particles per one mole of a substance. D) Number of grams per one mole of a substance. Show Answer Correct Answer: C) 6.02 x 10$^{23}$ particles per one mole of a substance. 15. A measurement which on repetition gives same or nearly same result iscalled A) Precise measurement. B) Average measurement. C) Accurate measurement. D) Estimated measurement. Show Answer Correct Answer: A) Precise measurement. 16. Calculate the molecular mass of sodium chloride A) 60 u. B) 58 u. C) 20 u. D) None of the above. Show Answer Correct Answer: B) 58 u. 17. One atomic mass unit (amu) is closest to the mass of: A) 6.022 x 10$^{23 }$atoms of hydrogen. B) The oxygen-16 nucleus. C) One proton. D) The carbon-12 nucleus. Show Answer Correct Answer: C) One proton. 18. What type of bond is formed when atoms share electrons? A) Covalent. B) Ionic. C) Polyatomic. D) Hydrogen. Show Answer Correct Answer: A) Covalent. 19. Chemistry is a branch of study which does not deals with ..... of matter. A) Preparation. B) Composition. C) Structure. D) None of the above is correct answer. Show Answer Correct Answer: D) None of the above is correct answer. 20. Atomic mass of boron is 10.81. It has two isotopes with 80% and 20% abundance respectively. The atomic mass of the isotope having 80% abundance is 11.01. The atomic mass of the other isotope is: A) 10.80. B) 10.01. C) 21.82. D) 11.01. Show Answer Correct Answer: B) 10.01. 21. Oxidation no. of alkaline earth metals is ..... A) -2. B) +1. C) +2. D) -1. Show Answer Correct Answer: C) +2. 22. Which of these has the greatest volume at the same temperature & pressure? A) 1 mole CO$_{2 }$gas. B) 1 mole of N$_{2}$O$_{4 }$gas. C) 1 mole of C$_{3}$H$_{8}$ gas. D) They all have the same volume. Show Answer Correct Answer: D) They all have the same volume. 23. Which one of the following pair of substances illustrates law of multiple proportions? A) H2O, D2O. B) CO, CO 2. C) MgO, Mg (OH) 2. D) NaCl, NaBr. Show Answer Correct Answer: B) CO, CO 2. 24. Which of the following are chemical properties?Basicity, Melting point, Reactivity, Boiling point, Colour, Odour, Combustability, Density, Mass, Acidity and Toxicity A) 6. B) 11. C) 8. D) 5. Show Answer Correct Answer: D) 5. 25. Which kind of mixture is seperable? A) HOMOGENOUS. B) HETEROGENOUS. C) None of the above. D) All of the above. Show Answer Correct Answer: D) All of the above. 26. How many atoms are present in 46 u of Na A) 1. B) 23. C) 46. D) 2. Show Answer Correct Answer: D) 2. 27. State the possible valencies for Iron: A) 1 and 2. B) 2 and 3. C) 4 and 2. D) 3 and 5. Show Answer Correct Answer: B) 2 and 3. 28. A jug contains 2 L of milk. The volume of milk in m$^{3}$ is: A) 2. B) 0.002. C) 0.02. D) 0.0002. Show Answer Correct Answer: B) 0.002. 29. The weight of iron which will be converted into its oxide (Fe$_{3}$O$_{4}$) by the action of 14.4 g of steam on it is: A) 12 g. B) 7.2 g. C) 28.8 g. D) 33.6 g. Show Answer Correct Answer: D) 33.6 g. 30. Which of the following contains highest number of moles of the substance in it A) 90 gm of water. B) 89.6 liters of oxygen at S.T.P. C) 12 gm of dihydrogen. D) 130 gm of carbon dioxide. Show Answer Correct Answer: C) 12 gm of dihydrogen. 31. Density of water A) 1 kg/L. B) 1 g/mL. C) 1 kg/m$^{3}$. D) Both 1 and 2. Show Answer Correct Answer: D) Both 1 and 2. 32. 16 amu is the mass of one atom A) Phosphorus. B) Oxygen. C) Nitrogen. D) Sulphur. Show Answer Correct Answer: B) Oxygen. 33. How many atoms of magnesium are present in 192u of Magnesium A) 0.25. B) 8. C) 25. D) 0.4. Show Answer Correct Answer: B) 8. 34. ..... is a separation technique for homogeneous mixtures that is based on the differences in boiling points of substances. A) Distillation. B) Filtration. C) Crystallization. D) Sublimation. Show Answer Correct Answer: A) Distillation. 35. Quantity of carbon dioxide produced by reaction of 48g of Carbon and 1 mol of dioxygen is ..... A) 24g. B) 22g. C) 44g. D) 11g. Show Answer Correct Answer: C) 44g. 36. What is the mass percent of carbon in carbon di oxide? A) 3.4%. B) 0.034%. C) 28.7%. D) 27.27%. Show Answer Correct Answer: D) 27.27%. 37. Which of the following reactions is not correct according to the law ofconservation of mass.(i) (ii) (iii) (iv) A) C3H8(g) + O2(g) $\rightarrow$CO2(g) + H2O(g). B) 2Mg(s) + O2(g) $\rightarrow$ 2MgO(s). C) CH4(g) + 2O2(g) $\rightarrow$ CO2(g) + 2H2O (g). D) P4(s) + 5O2(g)$\rightarrow$ P4O10(s). Show Answer Correct Answer: A) C3H8(g) + O2(g) $\rightarrow$CO2(g) + H2O(g). 38. Which of the following term is Unitless. A) Normality. B) Molality. C) Mole Fraction. D) Molarity. Show Answer Correct Answer: C) Mole Fraction. 39. . Boron exists as two stable isotopes; $^{10}$B(19%) and $^{11}$B(81%). Find out the average atomic weight of boron in the periodic table A) 10.8. B) 10.0. C) 11.2. D) 10.2. Show Answer Correct Answer: A) 10.8. 40. Two compounds A and B have same percentage composition. The compounds A and B A) Are identical. B) Are Isomers. C) Are neither identical nor isomers. D) All the three are correct. Show Answer Correct Answer: D) All the three are correct. 41. How many moles of ions are there per mole of Al$_{2}$(SO$_{4}$)$_{3}$? A) 5. B) 1. C) 3. D) 7. Show Answer Correct Answer: A) 5. 42. The concentration of sugar (C$_{12}$H$_{22}$O$_{11}$) in mol L$^{-1}$ if its 20 g are dissolved in enough water to make a volume up to 2 L is: A) 0.859. B) 0.92. C) 0.029. D) 0.356. Show Answer Correct Answer: C) 0.029. 43. The density of 3M solution of sodium chloride is 1.252 g mL$^{-1}$. The molality of the solution will be (molar mass, NaCl = 58.5 g mol$^{-1}$) A) (4) 2.79 m. B) (3) 2.60 m. C) (2) 3.00 m. D) 1) 2.18 m. Show Answer Correct Answer: A) (4) 2.79 m. 44. An molecular 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: B) The exact number of different types of atoms present in a molecule of a compound. 45. An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have? A) 0. B) 13. C) 7. D) 6. Show Answer Correct Answer: D) 6. 46. There are two chlorides of sulphur S$_{2}$Cl$_{2}$ and SCl$_{2}$. What is the equivalent mass of S in SCl$_{2}$(a) 64.8 g/mole A) 16 g/mole. B) 64.8 g/mole. C) 32 g/mole. D) 8 g/mole. Show Answer Correct Answer: A) 16 g/mole. 47. An atom of iodine has 7 valence electrons. What will an atom of iodine MOST likely do to be stable? A) Lose 1 electron. B) Gain 1 electron. C) Neither gain nor lose any valence electrons. D) Lost 7 electrons. Show Answer Correct Answer: B) Gain 1 electron. 48. Which of the following carbocation is most stable A) 4. B) Methyl. C) Secondary. D) Primary. E) Tertiary. Show Answer Correct Answer: E) Tertiary. 49. We need medicines in daily lifes for incase. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 50. ML of 1.5 M solution of sulphuric acid is diluted by adding 5L of water. The molarity of the diluted solution is: A) 0.0823. B) 12. C) 0.0926. D) 0.0714. Show Answer Correct Answer: D) 0.0714. 51. The density of a solution prepared by dissolving 120 g of urea (mol. mass = 60 u) in 1000 g of water is 1.15 g/mL. The molarity of this solution is A) 1.02 M. B) 1.78 M. C) 2.05 M. D) 0.50 M. Show Answer Correct Answer: C) 2.05 M. 52. Which of the following data illustrates the law of conservation of mass? A) 56 g of CO reacts with 32 g of oxygen to produce 44 g of carbon dioxide. B) 1.70 of Silver nitrate reacts with 100 mL of 0.1 MHCl to produce 1.435 g of AgCl and 0.63 g of nitric acid. C) 12 g of C is heated in vaccum and on cooling there is no change in mass. D) None of the above. Show Answer Correct Answer: B) 1.70 of Silver nitrate reacts with 100 mL of 0.1 MHCl to produce 1.435 g of AgCl and 0.63 g of nitric acid. 53. In 3 moles of ethane (C2H6), the moles of hydrogen atoms are: A) 36 mol. B) 18 mol. C) 12 mol. D) 6 mol. Show Answer Correct Answer: B) 18 mol. 54. 2L of 0.2M H$_{2}$SO$_{4}$ is reacted with 2L of 0.1M NaOH solution, the molarity of the resulting product Na$_{2}$SO$_{4}$ in the solution is ..... millimolar. A) 30. B) 25. C) 35. D) 20. Show Answer Correct Answer: B) 25. 55. For principal quantum number n=4, the total number of orbitals having l=3 is A) 3. B) 9. C) 5. D) 7. Show Answer Correct Answer: D) 7. 56. Which of the following law was given by Antoine Lavoisier? A) Law of definite composition. B) Law of conservation of mass. C) Only two of the options are correct. D) Law of definite proportion. Show Answer Correct Answer: B) Law of conservation of mass. 57. What are the three prime states of matter? A) Solid gas and water. B) Plasma gas and liquid. C) Gas solid and liquid. D) Plasma fluid and gas. Show Answer Correct Answer: C) Gas solid and liquid. 58. Choose the number of atoms present in 1mole of He A) 6.022 X 10$^{19}$. B) 6.022 X 10$^{21}$. C) 6.022 X 10$^{23}$. D) 6.022 X 10$^{20}$. Show Answer Correct Answer: C) 6.022 X 10$^{23}$. 59. Subatomic particles with a positive charge A) Atomic mass. B) Neutrons. C) Isotopes. D) Protons. Show Answer Correct Answer: D) Protons. 60. What vol of air is needed for complete combustion of 32g methane A) 4*22.4l. B) 2*22.4l. C) 20*22.4l. D) 22.4l. Show Answer Correct Answer: C) 20*22.4l. ← 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 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