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 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following statements does not form a part of Bohrs model of hydrogen atom? A) Energy of the electrons in the orbit is quantised. B) The electron in the orbit nearest the nucleus has the lowest energy. C) Electrons revolve in different orbits around the nucleus. D) The position and velocity of the electrons in the orbit cannot be determined simultaneously. Show Answer Correct Answer: D) The position and velocity of the electrons in the orbit cannot be determined simultaneously. 2. Find the Molar Mass of:Ga$_{2}$(SO$_{3}$)$_{3}$ A) 380 g/mol. B) 480 g/mol. C) 400 g/mol. D) 280 g/mol. Show Answer Correct Answer: A) 380 g/mol. 3. What will be the molality of the solution containing 18.25g of HCl gas in 500 g of water? A) 1 m. B) 0.5 m. C) 1 M. D) 0.1 m. Show Answer Correct Answer: A) 1 m. 4. The change in hybridization affects electronegativity of carbon. Arrange C(sp3), C(sp2) and C(sp) in the increasing order of electronegativity. A) C(sp3) B) C(sp3)< C(sp) C) C(sp)< C(sp2) D) None of the above. Show Answer Correct Answer: A) C(sp3) 5. The elements that are characterized by the electronic structure ns2, np6 A) Inner transiotion. B) Representative. C) Transion. D) Noble. Show Answer Correct Answer: D) Noble. 6. The unit of amount of substance is: A) Second. B) Ampere. C) Kilogram. D) Mole. Show Answer Correct Answer: D) Mole. 7. What is the mass of 2.50 mol of oxygen gas O$_{2}$? A) 32 g. B) 16 g. C) 40 g. D) 80 g. Show Answer Correct Answer: D) 80 g. 8. How many centimeters are in 3 inches? (1 inch = 2.54 cm) A) 7.62 cm. B) 5.54 cm. C) 0.83 cm. D) 8.62 cm. Show Answer Correct Answer: A) 7.62 cm. 9. A compound made up of two elements A and B has A=70%, B=30%.Their relative number of moles in the compound are 1.25 and 1.88. Calculate the atomic masses of the elements A and B, respectively. A) 40, 16. B) 56, 12. C) 56, 16. D) 65, 20. Show Answer Correct Answer: C) 56, 16. 10. Shift of sigma bond electron towards more electronegative atom is called A) Resonance. B) Inductive. C) Hyperconjugation. D) Electromeric. E) 2. Show Answer Correct Answer: B) Inductive. 11. How many significant figures are there in 10.020 moles? A) 4. B) 3. C) 2. D) 5. Show Answer Correct Answer: D) 5. 12. The number of molecules present in 1 dm$^{3}$ of Hydrogen at STP are: A) 2.69 X 10$^{22}$. B) 2.19 X 10$^{35}$. C) 6.023 X 10$^{23}$. D) None of the above. Show Answer Correct Answer: A) 2.69 X 10$^{22}$. 13. At STP, 2 g of Helium gas ( molar mass = 4) occupies a volume of A) 22.4 dm$^{3}$. B) 2 dm$^{3}$. C) 11.2 dm$^{3}$. D) 5.6 dm$^{3}$. Show Answer Correct Answer: C) 11.2 dm$^{3}$. 14. What kind of bond cleavage yields charged fragments? A) Substitution. B) Unifrom. C) Heterolysis. D) Homolysis. Show Answer Correct Answer: C) Heterolysis. 15. How many significant figures are there in 0.0054 grams? A) 1. B) 4. C) 3. D) 2. Show Answer Correct Answer: D) 2. 16. Convert-40 degree fahrenheit into kelvin. A) -40K. B) 233.15K. C) 258.75K. D) 313.15K. Show Answer Correct Answer: B) 233.15K. 17. To make 2.5 L of 0.25 M methanol solution (density 0.793 kg/L), volume of methanol needed is: A) 25.25 mL. B) 48 mL. C) 50.50 mL. D) 64 mL. Show Answer Correct Answer: A) 25.25 mL. 18. One mole is equal to how many particles (molecules, atoms)? A) 6.02 x 10$^{26}$. B) 6.02 x 10$^{23}$. C) 6.02 x 10$^{25}$. D) 6.02 x 10$^{24}$. Show Answer Correct Answer: B) 6.02 x 10$^{23}$. 19. How many atoms of carbon are in 6.00 g of carbon? A) 3.01x10$^{23 }$atoms C. B) 1.50x10$^{23 }$atoms C. C) 6.02x10$^{23 }$atoms C. D) 1.20x10$^{24 }$atoms C. Show Answer Correct Answer: A) 3.01x10$^{23 }$atoms C. 20. Carbon occur in nature as a mixture of C 12 and C13. Average atomic mass of carbon is 12.011 what is the % abundance if C 12 in nature? A) 97.6%. B) 99.8%. C) 98.5%. D) 98.9%. Show Answer Correct Answer: D) 98.9%. 21. State the reducing agent in this reaction.Cu + 4HNO$_{3}$ $\rightarrow$ Cu(NO$_{3}$)$_{2}$ + 2H$_{2}$O + 2NO$_{2}$ A) Cu(NO$_{3}$)$_{2}$. B) Cu. C) HNO$_{3}$. D) NO$_{2}$. Show Answer Correct Answer: B) Cu. 22. When multiplying 2.5 by 1.25, the answer should be reported with: A) 3 significant figures. B) 2 significant figures. C) 1 significant figure. D) 4 significant figures. Show Answer Correct Answer: B) 2 significant figures. 23. Highest Number of atoms are present in A) 12g He. B) 0.40g Ca. C) 46g Ne. D) 4g He. Show Answer Correct Answer: A) 12g He. 24. Determine the molar mass for CCl$_{4}$ A) 189.35 g/mol. B) 47.54 g/mol. C) 153.8 g/mol. D) 82.9 g/mol. Show Answer Correct Answer: C) 153.8 g/mol. 25. The amount of KClO$_{3}$ needed to supply sufficient oxygen for burning 112 L of CO gas at N.T.P is ..... A) 204.16 g. B) 9.859 g. C) 6.023 g. D) 308.25 g. Show Answer Correct Answer: A) 204.16 g. 26. What is the mass percent of carbon in carbon dioxide? A) 10. B) 40. C) 32. D) 27. Show Answer Correct Answer: D) 27. 27. The product of reacting propene with hydrochloric acid is: A) 2-chloropropyne. B) Chloropropane. C) 2-chloropropene. D) 2-chloropropane. Show Answer Correct Answer: D) 2-chloropropane. 28. Which of the following is not postulated in Dalton's atomic theory? A) There is a rearrangement in the atoms of reactants in a chemical reaction. B) Compounds are formed due to the combinmation of atoms of various elements in a fixed ratio. C) Matter consists of indivisible atoms. D) Mass is neither created nor destroyed. Show Answer Correct Answer: D) Mass is neither created nor destroyed. 29. How many Oxygen atoms are in H$_{2}$O? A) 0. B) 1. C) 2. D) 4. Show Answer Correct Answer: B) 1. 30. Equivalent mass of HNO3 (At.mass of N=14) A) 63. B) 65. C) 64. D) 67. Show Answer Correct Answer: A) 63. 31. Naturally occurring chlorine is 75% Cl$^{35}$ which has an atomic mass of 35 amu and 25% Cl$^{37}$ which has a mass of 37 amu . Calculate the average atomic mass of chlorine- A) 36.5 amu. B) 72 amu. C) 35.5 amu. D) 71 amu. Show Answer Correct Answer: C) 35.5 amu. 32. How many common scales does temperature have? A) 3. B) 1 to 100. C) -273.15 to +273.15. D) All of the above. Show Answer Correct Answer: A) 3. 33. If the kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would become A) Half. B) Two times. C) One fourth. D) Four times. Show Answer Correct Answer: A) Half. 34. How many significant figures are in 0.0025? A) 3. B) 2. C) 4. D) 1. Show Answer Correct Answer: B) 2. 35. Negative charge of carbanion can be dispersed by ..... A) (+I) effect and resonance. B) (-I) effect and resonance. C) Hyperconjugation. D) (+M) effect and resonance. Show Answer Correct Answer: B) (-I) effect and resonance. 36. How many significant figures:4.20 cm A) 1. B) 4. C) 2. D) 3. Show Answer Correct Answer: D) 3. 37. If 10 volumes of dihydrogen react with 5 volumes of dioxygen, how many volumes of water vapor are produced? A) 20 volumes. B) 5 volumes. C) 10 volumes. D) 15 volumes. Show Answer Correct Answer: C) 10 volumes. 38. Silver chloride is A) AgCl$_{3}$. B) AgCl. C) AgBr. D) AgCl$_{2}$. Show Answer Correct Answer: B) AgCl. 39. Formula of baking soda A) NaHCO3. B) Nacl. C) H2SO4. D) None of the above. Show Answer Correct Answer: A) NaHCO3. 40. How many unpaired electrons does an atom of chromium contain?this can be tricky ..... A) 6. B) 5. C) 3. D) 4. E) 2. Show Answer Correct Answer: A) 6. 41. What is the mass of 66 lb of sulfur in g A) 300g. B) 300000g. C) 3000g. D) 30000g. Show Answer Correct Answer: D) 30000g. 42. Atomic mass of carbon A) 20.14. B) 3.3. C) 12. D) 20.22. Show Answer Correct Answer: C) 12. 43. Bonds between metal and non metal A) Ionic compounds. B) Molecular compounds. C) All the above. D) None of the above. Show Answer Correct Answer: A) Ionic compounds. 44. Capital letter as a unit indicates the A) Name. B) SI unit. C) CGS system. D) IUPAC system. Show Answer Correct Answer: A) Name. 45. The formula for Silver [I] chloride is: A) AgCl$_{2}$. B) AgCl$_{2}$. C) AgCl. D) SiCl. Show Answer Correct Answer: C) AgCl. 46. How many valence electrons are in an atom of Ar? A) 1. B) 4. C) 2. D) 8. Show Answer Correct Answer: D) 8. 47. Weight of oxygen in one mole each of Fe$_{2}$O$_{3}$ and FeO is in the simple ratio of A) 3:1. B) 1:2. C) 3:2. D) 2:1. Show Answer Correct Answer: A) 3:1. 48. Molecular mass of nitric acid A) 63. B) 62. C) 53. D) 52. Show Answer Correct Answer: A) 63. 49. How many moles of methane are required to produce 22g of CO$_{2}$(g) after combustion? A) 0.5 Moles. B) 2 Moles. C) 0.05 Moles. D) 1 Moles. Show Answer Correct Answer: A) 0.5 Moles. 50. A measured temperature on Fahrenheit scale is is 200$^\circ$F .What will be it's reading on Celcius scale? A) 40$^\circ$C. B) 30$^\circ$C. C) 94$^\circ$C. D) 93.3$^\circ$C. Show Answer Correct Answer: D) 93.3$^\circ$C. 51. Atom is the smallest particle of A) Element. B) Mixture. C) Compound. D) Substance. Show Answer Correct Answer: A) Element. 52. The empirical formula for hydrocarbon A is C$_{2}$H$_{7}$O. If the molar mass of the hydrocarbon is 141 g/mol, determine the molecular formula for this hydrocarbon. A) C$_{4}$H$_{14}$O$_{2}$. B) C$_{8}$H$_{28}$O$_{4}$. C) C$_{6}$H$_{21}$O$_{3}$. D) C$_{2}$H$_{7}$O. Show Answer Correct Answer: C) C$_{6}$H$_{21}$O$_{3}$. 53. Which would have more atoms? A) 1 mole of Li. B) 1 mole of Au. C) 1 mole of Si. D) None, all are equal. Show Answer Correct Answer: D) None, all are equal. 54. The ..... states that mass is neither created nor destroyed in a chemical reaction, it is conserved A) Law of Conservation of Water. B) Law of Conservation of Minerals. C) Law of Conservation of Matter. D) Law of Conservation of Atoms. Show Answer Correct Answer: C) Law of Conservation of Matter. 55. Determine the number of moles of Na$_{2}$CrO$_{4}$ that contain 4.33 x 10$^{24}$ oxygen atoms. Given the Avogadro's number, NA is 6.02 x 10$^{23}$. A) 64.00 mol. B) 7.19 mol. C) 1.80 mol. D) 6.77 mol. Show Answer Correct Answer: C) 1.80 mol. 56. How many significant figures:216 m A) 2. B) 1. C) 0. D) 3. Show Answer Correct Answer: D) 3. 57. Avogadro's number of representative particles is equal to one ..... A) Molecule. B) Atom. C) Mole. D) Gram. Show Answer Correct Answer: C) Mole. 58. An element, X has the following isotopic composition, $^{200}$X:90%$^{199}$X:8%$^{202}$X:2%The weighted average atomic mass of the naturally occurring element 'X' is closest to: A) 202 amu. B) 200 amu. C) 201 amu. D) 199 amu. Show Answer Correct Answer: B) 200 amu. 59. An alcohol can be ..... to form a carboxylic acid A) Reduced. B) Broken down. C) Polymerised. D) Oxidised. Show Answer Correct Answer: D) Oxidised. 60. Carbonium ions are the intermediates in which the positive charge is carried by the carbon atom with ..... electrons in the valence shell. A) 7. B) 5. C) 6. D) 8. Show Answer Correct Answer: C) 6. 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