This quiz works best with JavaScript enabled. Home > Class 11 > 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 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Law of definite proportions states that equal volumes of all gases under similar conditions of pressure and temperature contain equal number of molecules. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 2. What does the ATOMIC MASS tell us about an atom? A) Protons + Neutrons. B) Protons + Electrons. C) Neutrons + Electrons. D) None of the above. Show Answer Correct Answer: A) Protons + Neutrons. 3. What is the smallest 'building block' of the elements that make up the universe? A) An atom. B) An electron. C) A proton. D) A cell. Show Answer Correct Answer: A) An atom. 4. Which of the following contains more molecules A) CO$_{2}$. B) N$_{2 }$. C) H$_{2}$. D) CH$_{4}$. Show Answer Correct Answer: C) H$_{2}$. 5. Number of atoms in 84 amu of He is A) 11. B) 22. C) 21. D) 43. Show Answer Correct Answer: C) 21. 6. Who was not a french chemist among the following? A) John Dalton. B) Antoine Laviosier. C) Joseph Proust. D) Gay lussac. E) Avagadro. Show Answer Correct Answer: A) John Dalton. 7. 23+1.020Find the correct answer A) 6.401. B) 6.4. C) 6.40. D) 7.00. Show Answer Correct Answer: C) 6.40. 8. SI unit of volume is A) Dm$^{3}$. B) M$^{3}$. C) Cm$^{3}$. D) Cc. Show Answer Correct Answer: B) M$^{3}$. 9. Oxidation is ..... A) Addition of oxygen and removal of hydrogen. B) Addition of hydrogen and removal of oxygen. C) All the above. D) None of the above. Show Answer Correct Answer: A) Addition of oxygen and removal of hydrogen. 10. If 10$^{21}$ molecules are removed from 200 mg of CO$_{2}$, then the number of moles of CO$_{2 }$left are A) 2.88 x 10$^{-3}$. B) 1.66 x 10$^{-3}$. C) 4.54 x 10$^{-3}$. D) 1.66 x 10$^{-3}$. Show Answer Correct Answer: A) 2.88 x 10$^{-3}$. 11. Mass percent of phosphorus in calcium phosphate is A) 38.71%. B) 20%. C) 41.29%. D) 28%. Show Answer Correct Answer: B) 20%. 12. When CO$_{2}$ (g) is passed over red hot coke it partially gets reduced to CO(g). Upon passing 0.5 litre of CO$_{2}$ (g) over red hot coke, the total volume of the gases increased to 700 mL. The composition of the gaseous mixture at STP is: A) 1) CO$_{2}$ = 200 mL:CO = 500mL. B) (2) CO$_{2}$ = 350 mL:CO = 350mL. C) (3) CO$_{2}$ = 0.0 mL:CO = 700mL. D) (4) CO$_{2}$ = 300 mL:CO = 400mL. Show Answer Correct Answer: D) (4) CO$_{2}$ = 300 mL:CO = 400mL. 13. Lead Sulphate+Ammonium Hydroxide $\rightarrow$ Ammonium sulphate +Lead hydroxide.Choose the correct Chemical equation for the above mentioned word equation. A) PbSo$_{4}$ + Nh$_{4}$OH $\rightarrow$ NH$_{4}$SO$_{4}$ + Pb(OH)$_{2}$. B) PbSO$_{4 }$+ NH$_{4}$OH $\rightarrow$ NH$_{4}$(SO$_{4}$)$_{2}$ + Pb(OH)$_{2}$. C) PBSO4 + NH$_{4OH }$$\rightarrow$ NH$_{4}$SO$_{4 }$+ PB(OH)$_{2}$. D) PbSO$_{4}$ + NH$_{4}$OH $\rightarrow$ (NH$_{4}$)$_{2}$SO$_{4}$ + Pb(OH)$_{2}$. Show Answer Correct Answer: D) PbSO$_{4}$ + NH$_{4}$OH $\rightarrow$ (NH$_{4}$)$_{2}$SO$_{4}$ + Pb(OH)$_{2}$. 14. 1 mole =? A) 60.22 x 10$^{23}$. B) 6.22 x 10$^{23}$. C) 6.022 x 10$^{23}$. D) 6.022 x 10$^{25}$. Show Answer Correct Answer: C) 6.022 x 10$^{23}$. 15. If the molecular formula for compound Z is C$_{8}$H$_{18}$. What is the empirical formula? A) C$_{8}$H$_{18}$. B) C$_{4}$H$_{8}$. C) CH$_{9}$. D) C$_{4}$H$_{9}$. Show Answer Correct Answer: D) C$_{4}$H$_{9}$. 16. Mass of 1 atom is known as A) Atomic mass. B) Molecular mass. C) Molar mass. D) None of the above. Show Answer Correct Answer: A) Atomic mass. 17. How many gram is 0.5 mol of Copper atoms? (Cu:63, 5g/mol) A) 63, 5 g. B) 6, 35 g. C) 31, 75 g. D) 3, 175 g. Show Answer Correct Answer: C) 31, 75 g. 18. For preparing M/ 10 solution of H2SO4 in one litre we need H2SO4: A) 9.8 g. B) 49.0 g. C) 4.8 g. D) 0.09 g. Show Answer Correct Answer: A) 9.8 g. 19. Molar mass carbondioxide A) 43. B) 44. C) 45. D) 46. Show Answer Correct Answer: B) 44. 20. A compound was found to contain nitrogen and oxygen in the ratio, nitrogen 28 g and 80 g of oxygen. The formula of the compound is: A) NO. B) N2O3. C) N2O5. D) N2O4. Show Answer Correct Answer: C) N2O5. 21. Matter plays a major role in chemistry . What are the two classifications of matter? A) Preparational and physical. B) Compositional and chemistry. C) Preparational and compositional. D) Physical and chemical. Show Answer Correct Answer: D) Physical and chemical. 22. Which of the following weighs least?one gram-atom of nitrogen, one mole of calcium, one mole of oxygen molecules. A) One gram-atom of nitrogen. B) One mole of calcium. C) One mole of oxygen molecules. D) All of the above. Show Answer Correct Answer: A) One gram-atom of nitrogen. 23. There is a uniform composition of substance in ..... mixture A) HETEROGENOUS. B) HOMOGENOUS. C) All the above. D) None of the above. Show Answer Correct Answer: B) HOMOGENOUS. 24. Given, that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is A) 55.85. B) 55.95. C) 55.75. D) 56.05. Show Answer Correct Answer: A) 55.85. 25. In Avogadro's law volume is directly proportional to ..... A) Pressure. B) Number of moles. C) Volume. D) Temperature. Show Answer Correct Answer: B) Number of moles. ← 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 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 10Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books