This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 18 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is a Excess Reagent? A) Amount you end with. B) What you run out of first. C) What you have left over. D) What you start with. Show Answer Correct Answer: C) What you have left over. 2. Name the elements present in Ammonia A) Nitrogen. B) Hydrogen. C) Both nitrogen and hydrogen. D) None of the above. Show Answer Correct Answer: C) Both nitrogen and hydrogen. 3. The maximum number of electrons with quantum numbers with n=3 and l=2 is A) 2. B) 4. C) 6. D) 10. Show Answer Correct Answer: D) 10. 4. Avogadro's number represents the number of atoms in A) 12g of C12. B) 320g of S. C) 32g of Oxygen. D) 12.7g of iodine. Show Answer Correct Answer: A) 12g of C12. 5. What is different in mixture and pure substances? A) Mixture is composed of substances in any ratio and pure substances are composed in a fixed ratio. B) Mixture is composed of substances in a fixed ratio and pure substances are composed in any ratio. C) All the above. D) None of the above. Show Answer Correct Answer: A) Mixture is composed of substances in any ratio and pure substances are composed in a fixed ratio. 6. The symbol and valency of ammonium is A) NH$_{4}$, valency is 1. B) NH$_{3}$, valency is 1. C) NH$_{3 }$, valency is 2. D) None of the above. Show Answer Correct Answer: A) NH$_{4}$, valency is 1. 7. L of oxygen is A) 1 mol. B) 2 mol. C) 3 mol. D) 0.3 mol. Show Answer Correct Answer: C) 3 mol. 8. Most suitable element and most widely accepted standard unit for the measurement of atomic mass A) Oxygen. B) Carbon. C) Nitrogen. D) None of the above. Show Answer Correct Answer: B) Carbon. 9. A certain atom of oxygen contains 8 protons, 8 neutrons, & 8 electrons. Another atom of unknown identity contains 9 protons. Which of the following MUST be true about this unidentified atom? A) It has 9 neutrons in its nucleus. B) It is an isotope of oxygen. C) Its atomic mass is a decimal number. D) It cannot be an atom of oxygen. Show Answer Correct Answer: D) It cannot be an atom of oxygen. 10. A pure substance composed of two or more different elements is A) Element. B) Homogeneous mixture. C) Heterogeneous mixture. D) Chemical compound. Show Answer Correct Answer: D) Chemical compound. 11. According to IUPAC nomenclature the name of elements having atomic numbers 103 and 116 are A) Unniltriium and unnilhexium. B) Unniltrium and ununhexium. C) Ununtrium and ununhexium. D) None of these. Show Answer Correct Answer: B) Unniltrium and ununhexium. 12. The number of atoms present in one mole of an element is equal to Avogadronumber. Which of the following element contains the greatest number ofatoms? A) 4g He. B) 46g Na. C) 0.4g Ca. D) 12g He. Show Answer Correct Answer: D) 12g He. 13. What is the maximum number of electrons that contain the values n=4 l=3 A) 2. B) 6. C) 10. D) 14. E) 18. Show Answer Correct Answer: D) 14. 14. If 20 litre nitrogen gas reacts with 30 litre hydrogen gas to give ammonia, the volume of product formed is A) 40. B) 20. C) 50. D) 30. Show Answer Correct Answer: B) 20. 15. $\left(9.6\times10^5\right)\times\left(3.3\times10^{-2}\right)$ A) 5. B) 4. C) -2. D) 3. Show Answer Correct Answer: B) 4. 16. If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li$^{++}$ is A) 13.6 eV. B) 30.6 eV. C) 122.4 eV. D) 3.4 eV. Show Answer Correct Answer: B) 30.6 eV. 17. Which of the following numbers have three significant figures?0.300, 0.002, 1.09, 522, 562.0, 5.00, 0.00010, 66.0, 1.100, 1.00001 A) 5. B) 3. C) 2. D) 4. Show Answer Correct Answer: D) 4. 18. Number of atoms in 52 moles of Ar is: A) $3.13 \times 10^{22}$. B) $3.13 \times 10^{23}$. C) $3.13 \times 10^{24}$. D) $3.13 \times 10^{25}$. Show Answer Correct Answer: D) $3.13 \times 10^{25}$. 19. A solution is 25% water, 25% ethanol and 50% acetic acid by mass. The mole fraction of water is: A) 0.6. B) 0.856. C) 0.99. D) 0.502. Show Answer Correct Answer: D) 0.502. 20. 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. 21. 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) 1.51 eV. B) 3.4 eV. C) 6.04 eV. D) 13.6 eV. Show Answer Correct Answer: A) 1.51 eV. 22. Identify the number of Chlorine atoms in 65.8 g CaCl$_{2.}$ A) 7.14 x 10$^{23}$ atoms. B) 8.71 x 10$^{23}$ atoms. C) 1.22 x 10$^{23}$ atoms. D) 3.57 x 10$^{23}$ atoms. Show Answer Correct Answer: A) 7.14 x 10$^{23}$ atoms. 23. The SI unit of mass is the: A) Gram. B) Kilogram. C) Pound. D) Newton. Show Answer Correct Answer: B) Kilogram. 24. Highly reactive metal among the metals in the periodic table A) Potassium. B) Sodium. C) Hydrogen. D) Nickel. Show Answer Correct Answer: B) Sodium. 25. For aq sol, which is true A) 1m=1M. B) 1m is less concentrated than 1M. C) 1m is more concentrated than 1M. D) Data insufficient. Show Answer Correct Answer: B) 1m is less concentrated than 1M. ← PreviousNext →Related 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 8Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 9Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books