This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry – Quiz 15 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 15 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Mole of carbohydrate of empirical formula CH$_{2}$O contain 1 g of hydrogen. The molecular formula of the carbohydrate is A) C$_{5}$H$_{10}$O$_{5}$. B) C$_{3}$H$_{4}$O$_{3}$. C) C$_{12}$H$_{22}$O$_{11}$. D) C$_{6}$H$_{12}$O$_{6}$. Show Answer Correct Answer: D) C$_{6}$H$_{12}$O$_{6}$. 2. Which of the following is not possible? A) N=3, l=2, m=0. B) N=1, l=0, m=0. C) N=3, l=3, m=2. D) N=4, l=3, m=-3. Show Answer Correct Answer: C) N=3, l=3, m=2. 3. Electronegativity ..... from left to right within a period and ..... from top to bottom within a group. A) Decreases, increases. B) Increases, increases. C) Increases, decreases. D) Stays the same, increases. Show Answer Correct Answer: C) Increases, decreases. 4. General formula for alkyne is ..... A) C$_{n}$H$_{2n+2}$. B) C$_{n}$H$_{2n}$. C) C$_{n}$H$_{2n-2}$. D) C$_{n}$H$_{2n+1}$. Show Answer Correct Answer: C) C$_{n}$H$_{2n-2}$. 5. A neutral species that has an unpaired electron is called a ..... A) Electrophile. B) Nucleophile. C) Carbanion. D) Free radical. Show Answer Correct Answer: D) Free radical. 6. 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. 7. The stability of carbocation follows the order: A) Primary> Secondary>Tertiary> Methyl. B) Secondary>Tertiary> Primary> Methyl. C) Tertiary > Secondary> Primary > Methyl. D) None of the above. Show Answer Correct Answer: C) Tertiary > Secondary> Primary > Methyl. 8. A contaminated water sample has 15 ppm chloroform (CHCl3). What is this in % by mass? A) 0.0015%. B) 0.015%. C) 0.15%. D) 1.5%. Show Answer Correct Answer: A) 0.0015%. 9. 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$_{2}$. 10. 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) 8. B) 4. C) 7. D) 10. Show Answer Correct Answer: A) 8. 11. 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. 12. Symbol of copper is A) Co. B) Cu. C) Ca. D) None of the above. Show Answer Correct Answer: B) Cu. 13. A(n) ..... is a pure substance made of a single type of atom and cannot be broken down. A) Element. B) Compound. C) Molecule. D) Mixture. Show Answer Correct Answer: A) Element. 14. Which is used to Express amount of mercury vapour in atmosphere A) M. B) M. C) Mole fraction. D) Ppm. Show Answer Correct Answer: D) Ppm. 15. The amount of 70% HNO$_{3}$ required to prepare 250 ml of 2.0 M HNO$_{3}$ is A) 45g. B) 31.5g. C) 90g. D) 70g. Show Answer Correct Answer: A) 45g. 16. Given isotope data, calculate molar mass of naturally occurring argon: A) 38.0 g/mol. B) 39.9 g/mol. C) 40.0 g/mol. D) 41.2 g/mol. Show Answer Correct Answer: B) 39.9 g/mol. 17. 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) Conservation of mass. C) Multiple proportions. D) Reciprocal proportions. Show Answer Correct Answer: A) Constant proportions. 18. 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) Add 160 mL of water to the initial solution. B) Add 160 grams of water to the initial solution. C) Evaporate 160 mL from the initial volume. D) The experiment cannot be conducted with the materials provided. Show Answer Correct Answer: A) Add 160 mL of water to the initial solution. 19. Which science examines the structure of living organisms at the atomic level? A) Biochemistry. B) Geology. C) Zoology. D) Cytology. Show Answer Correct Answer: A) Biochemistry. 20. The volume of 400 g of gold ( density 19.3 g / cm3 ) will be A) 15.3. B) 19.3. C) 20.3. D) 22.3. Show Answer Correct Answer: C) 20.3. 21. The molality of a solution of methanol in water in which the mole fraction of methanol is 0.25 is ..... A) 14.7. B) 20.3. C) 12.6. D) 18.5. Show Answer Correct Answer: D) 18.5. 22. 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) 3.14 M. B) 0.04 M. C) 0.615 M. D) 4.2 M. Show Answer Correct Answer: C) 0.615 M. 23. The volume of a steel ball if the diameter of 7.5mm is A) 221. B) 110. C) 442. D) 1768. Show Answer Correct Answer: A) 221. 24. 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) 11.4 mL. B) 12.0mL. C) 33.3 mL. D) 35.0 mL. Show Answer Correct Answer: C) 33.3 mL. 25. 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. ← 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