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 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 16 g of oxygen has same number of molecules as in [atomic mass of O=16, C=12, N=14, H=1] A) 16 g of CO. B) 28 g of N$_{2}$. C) 14 g of N$_{2}$. D) 1.0 g of H$_{2}$. Show Answer Correct Answer: B) 28 g of N$_{2}$. 2. Using isotope data, the average atomic mass of chlorine is approximately: A) 35.45 u. B) 34.97 u. C) 37.23 u. D) 36.97 u. Show Answer Correct Answer: A) 35.45 u. 3. Match the prefix "micro" with its correct multiple: A) $10^{-6}$. B) $10^9$. C) $10^6$. D) $10^{-15}$. Show Answer Correct Answer: A) $10^{-6}$. 4. Homogeneous Mixture is formed by mixing ..... A) Phenol and Water. B) Iron filing and sand. C) Silver chloride and ethanol. D) Ethanol and water. Show Answer Correct Answer: D) Ethanol and water. 5. Molecular mass of water is A) 18u. B) 16u. C) 20u. D) None of the above. Show Answer Correct Answer: A) 18u. 6. How many moles of hydrogen is required to produce 10 moles of ammonia? A) 30 moles of hydrogen. B) 60 moles of hydrogen. C) 45 moles of hydrogen. D) 15 moles of hydrogen. Show Answer Correct Answer: D) 15 moles of hydrogen. 7. 1 mole is equal to A) 22.2 L at stp. B) 22.4 L at stp. C) 20 L at stp. D) None of the above. Show Answer Correct Answer: B) 22.4 L at stp. 8. Which one of the following is not a mixture? A) Air. B) Brass. C) 22 Carat gold. D) Water. Show Answer Correct Answer: D) Water. 9. What is oxidation number of H in CaH$_{2}$? A) +1. B) -1. C) +2. D) 0. Show Answer Correct Answer: B) -1. 10. Calculate the mass of 2.5 gram atoms of oxygen. A) 50.0g. B) 70.0g. C) 9.6. D) None of these. Show Answer Correct Answer: D) None of these. 11. The empirical formulae for sucrose C12H22O11 A) C12H22O11. B) C2HO. C) C6H11O11. D) CH2O. Show Answer Correct Answer: A) C12H22O11. 12. A molal solution is one that contains one mole of a solute in4a)1000 g of the solventb)one litre of the solventc)one litre of the solutiond)22.4 litres of the solution A) 1000 g of the solvent. B) One litre of the solution. C) One litre of the solvent. D) 22.4 litres of the solution. Show Answer Correct Answer: A) 1000 g of the solvent. 13. Oxidation no. of a free element is ..... A) 0. B) 1. C) +1. D) None of the above. Show Answer Correct Answer: A) 0. 14. Oxidation no. of Flourine is ..... A) 0. B) +1. C) -1. D) None of the above. Show Answer Correct Answer: C) -1. 15. Number of moles of water in 1 liter of water with dencity 1 g/cc are A) 45.56. B) 56.55. C) 55.56. D) 56.45. Show Answer Correct Answer: C) 55.56. 16. 25 mL of a solution of barium hydroxide on titration with 0.1 M solution of HCl gave a titre value of 35 mL. The molarity of BaOH2 is: A) 0.28. B) 0.14. C) 0.35. D) 0.07. Show Answer Correct Answer: B) 0.14. 17. The mass of 11.2 L of ammonia gas at STP is A) 8.5 g. B) 17 g. C) 85 g. D) 1.7 g. Show Answer Correct Answer: A) 8.5 g. 18. Molecule is the smallest particle of A) Substance. B) Element. C) Compound. D) Mixture. Show Answer Correct Answer: C) Compound. 19. Calculate the number of moles in 89.6 L of hydrogen gas A) 2 mol. B) 4 mol. C) 3 mol. D) None of the above. Show Answer Correct Answer: B) 4 mol. 20. What was the slides mainly explaining about? A) About physics. B) About medicines. C) About chemistry in medicines. D) About chemistry. Show Answer Correct Answer: C) About chemistry in medicines. 21. Mass of 1 atom (in gms) is known as A) Atomic mass. B) Molecular mass. C) Molar mass. D) None of the above. Show Answer Correct Answer: C) Molar mass. 22. What will be the value of 100 micro m x 100 micro m x 0.1 mm A) 10$^{-9}$ mm$^{3}$. B) 10$^{-6}$ mm$^{3}$. C) 10$^{-7}$mm$^{3}$. D) 10$^{-3}$ mm$^{3}$. Show Answer Correct Answer: D) 10$^{-3}$ mm$^{3}$. 23. The majority of an atom's mass exists where? A) In the nucleus. B) In the electron cloud. C) In the space between the nucleus and the electrons. D) In the neutrons. Show Answer Correct Answer: A) In the nucleus. 24. The oxidation number of oxygen in peroxide A) -1. B) -2. C) +2. D) 0. Show Answer Correct Answer: A) -1. 25. L at STP is known as A) Molar mass. B) Equivalent volume. C) Volume. D) Molar volume. Show Answer Correct Answer: D) Molar volume. 26. How many atoms of magnesium are present in 96u of Magnesium A) 0.4. B) 25. C) 4. D) 0.25. Show Answer Correct Answer: C) 4. 27. Which of the following is isoelectronic with Ca$^{2+}$ A) P. B) Mg$^{2+}$. C) Fe$^{3+}$. D) S$^{2-}$. Show Answer Correct Answer: D) S$^{2-}$. 28. This law states that energy cannot be created or destroyed, but it can change form. A) Exothermic reaction. B) Law of Conservation of MatterLOCOM. C) Law of Conservation of EnergyLOCOE. D) Endothermic reaction. Show Answer Correct Answer: C) Law of Conservation of EnergyLOCOE. 29. A mixture of Ammonium chloride and iodine can be separated by A) Fractional crystallization. B) Extraction with water. C) Sublimation. D) Chromatography. Show Answer Correct Answer: B) Extraction with water. 30. If the density of a solution is 4.5g/mL, the mass of 1.4mL solution in significant figure is A) 3.21g. B) 0.63g. C) 4.5g. D) 6.3g. Show Answer Correct Answer: D) 6.3g. 31. One mole of oxygen gas at STP is equal A) 6.022 x 10$^{23}$ molecules of oxygen. B) 6.022 x 10$^{23}$ atoms of oxygen. C) 1.6 g of oxygen. D) 32 g of oxygen. Show Answer Correct Answer: A) 6.022 x 10$^{23}$ molecules of oxygen. 32. A ..... is a pure substance that is composed of only one type of atom? A) Mixture. B) Element. C) Particulate. D) Compound. Show Answer Correct Answer: B) Element. 33. How many grams of glucose are needed to prepare 400mL of 5% glucose solution? A) 5g. B) 10g. C) 20g. D) 14g. Show Answer Correct Answer: C) 20g. 34. Anything that takes up space and has mass is known as ..... A) Stuff. B) Molecules. C) Compounds. D) Matter. Show Answer Correct Answer: D) Matter. 35. Atomicity of phosphorus is A) 4. B) 3. C) 1. D) 2. Show Answer Correct Answer: A) 4. 36. Number of significant figures in 12.6 X 11.2 are: A) 4. B) 6. C) 3. D) 2. Show Answer Correct Answer: C) 3. 37. Molecular mass of ammonia A) 14. B) 12. C) 17. D) 13. Show Answer Correct Answer: C) 17. 38. Which of the following paramagnetic in nature A) Carbanion. B) Nitene. C) Carbon freeradical. D) Carbocation. E) 1. Show Answer Correct Answer: C) Carbon freeradical. 39. 1L is NOT equal to A) 1000mL. B) 10$^{-3 }$m$^{3}$. C) 10$^{3 }$cm$^{3}$. D) 10 dm$^{3}$. Show Answer Correct Answer: D) 10 dm$^{3}$. 40. What is the empirical formula for thr compound, C$_{x}$H$_{y}$O$_{z}$, if the ratio C:H:O equal to 2:2.5:1 A) C$_{3}$H$_{2}$O$_{2}$. B) C$_{2}$H$_{5}$O$_{1}$. C) C$_{2}$H$_{2}$O$_{1}$. D) C$_{4}$H$_{5}$O$_{2}$. Show Answer Correct Answer: D) C$_{4}$H$_{5}$O$_{2}$. 41. The molarity of sugar solution where 20 g sugar is dissolved to make 2 L solution is: A) 0.22 mol/L. B) 0.11 mol/L. C) 0.027 mol/L. D) 0.055 mol/L. Show Answer Correct Answer: C) 0.027 mol/L. 42. If the density of methanol is 0.793 kg L$^{-1}$, what is its volume needed for making 2.5L of its 0.25 M solution? A) 24.55 mL. B) 25.33 mL. C) 25.22 mL. D) 24.22 mL. Show Answer Correct Answer: C) 25.22 mL. 43. Which of the following statements about significant figures is TRUE? A) Counting numbers like 2 or 20 have a fixed number of significant figures. B) In numbers written in scientific notation, only digits before the decimal point are significant. C) Counting numbers such as 2 balls have infinite significant figures because they are exact numbers. D) Zeros at the end of a number without a decimal are always significant. Show Answer Correct Answer: C) Counting numbers such as 2 balls have infinite significant figures because they are exact numbers. 44. What are the possible values of the magnetic quantum number for an electron in a 3p orbital? A) -2, -1, 0, +1, +2. B) -3, -2, -1, 0, +1, +2, +3. C) 0. D) -1, 0, +1. Show Answer Correct Answer: D) -1, 0, +1. 45. Using the rules for significant figures, the correct answer for the expression (0.02858 x 0.112)/0.5702 will be A) 0.006. B) 0.00561. C) 0.0056. D) 0.005613. Show Answer Correct Answer: B) 0.00561. 46. States of matter A) Solid, liquid and gases. B) Solid and gas. C) Solid & liquid. D) Liquid and gas. Show Answer Correct Answer: A) Solid, liquid and gases. 47. Mass of sucrose C$_{12}$H$_{22}$O$_{11}$ produced by mixing 84 gm of carbon, 12 gm of hydrogen and 56 lit. O$_{2}$ at 1 atm & 273 K according to given reaction, is C(s) + H$_{2}$(g) + O$_{2}$(g) $\rightarrow$ C$_{12}$H$_{22}$O$_{11}$ (s) A) 155.5. B) 199.5. C) 138.5. D) 172.5. Show Answer Correct Answer: A) 155.5. 48. Avogadro's no is the no. of particles present in A) 1 molecule. B) 1 atom. C) 1 kg. D) 1 mole. Show Answer Correct Answer: D) 1 mole. 49. Atomicity of ammonium phosphate molecule is A) 5. B) 15. C) 10. D) 20. Show Answer Correct Answer: D) 20. 50. The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1:4. The ratio of number of their molecule is: A) 1:4. B) 7:32. C) 1:8. D) 3:16. Show Answer Correct Answer: B) 7:32. 51. Dm$^{3 }$at STP is A) Atomic volume. B) Molar volume. C) Molecular mass. D) Molar atomic mass. Show Answer Correct Answer: B) Molar volume. 52. Sugarcane juice and NaCl solution results in A) Homogenous mixture. B) Heterogenous mixture. C) Pure substances. D) None of these are correct. Show Answer Correct Answer: A) Homogenous mixture. 53. Boron has two isotopes boron-10 and boron-11 whose percentage abundances are 19.6% and 80.4% respectively. What is the average atomic mass of boron? A) 10.8. B) 10.6. C) 9.6. D) NNone of these. Show Answer Correct Answer: A) 10.8. 54. How many sigma bonds are there in acetylene molecule? A) 5. B) 2. C) 3. D) 1. Show Answer Correct Answer: C) 3. 55. Mass / molar mass = number of moles (n) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 56. Number of moles of sugar in 547.2 gram are:(Mol. mass of sugar = 342) A) 2.2. B) 548. C) 342. D) 1.6. Show Answer Correct Answer: D) 1.6. 57. How many moles of magnesium are present in 96u of Magnesium A) 25. B) 0.25. C) 4. D) 0.4. Show Answer Correct Answer: C) 4. 58. A ..... is a transition of matter from one state to another A) Chemical change. B) Phase change. C) All the above. D) None of the above. Show Answer Correct Answer: B) Phase change. 59. Which of the following statements in relation to the hydrogen atom is correct? A) 3s orbital is lower in energy than 3p orbital. B) 3p orbital is lower in energy than 3d orbital. C) 3s and 3p orbitals are of lower energy than 3d orbital. D) 3s, 3p and 3d orbitals all have the same energy. Show Answer Correct Answer: D) 3s, 3p and 3d orbitals all have the same energy. 60. H$_{2 }$and CH$_{4 }$have something in common what is it? A) They have same number of hydrogen atoms. B) They are organic in nature. C) They both are called as molecule. D) They are elements. Show Answer Correct Answer: C) They both are called as molecule. ← 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 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