This quiz works best with JavaScript enabled. Home > Class 11 > 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 (25 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) 280 g/mol. B) 400 g/mol. C) 380 g/mol. D) 480 g/mol. Show Answer Correct Answer: C) 380 g/mol. 3. What will be the molality of the solution containing 18.25g of HCl gas in 500 g of water? A) 0.1 m. B) 1 M. C) 0.5 m. D) 1 m. Show Answer Correct Answer: D) 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) Noble. B) Representative. C) Transion. D) Inner transiotion. Show Answer Correct Answer: A) Noble. 6. The unit of amount of substance is: A) Ampere. B) Second. C) Mole. D) Kilogram. Show Answer Correct Answer: C) Mole. 7. What is the mass of 2.50 mol of oxygen gas O$_{2}$? A) 40 g. B) 80 g. C) 16 g. D) 32 g. Show Answer Correct Answer: B) 80 g. 8. How many centimeters are in 3 inches? (1 inch = 2.54 cm) A) 7.62 cm. B) 0.83 cm. C) 5.54 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) 65, 20. B) 56, 16. C) 40, 16. D) 56, 12. Show Answer Correct Answer: B) 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) 2. B) 3. C) 4. 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) 11.2 dm$^{3}$. C) 5.6 dm$^{3}$. D) 2 dm$^{3}$. Show Answer Correct Answer: B) 11.2 dm$^{3}$. 14. Reduction is ..... A) Gain of electrons. B) Loss of electrons. C) All the above. D) None of the above. Show Answer Correct Answer: A) Gain of electrons. 15. What kind of bond cleavage yields charged fragments? A) Heterolysis. B) Homolysis. C) Substitution. D) Unifrom. Show Answer Correct Answer: A) Heterolysis. 16. How many significant figures are there in 0.0054 grams? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 17. Convert-40 degree fahrenheit into kelvin. A) 233.15K. B) 313.15K. C) 258.75K. D) -40K. Show Answer Correct Answer: A) 233.15K. 18. To make 2.5 L of 0.25 M methanol solution (density 0.793 kg/L), volume of methanol needed is: A) 48 mL. B) 64 mL. C) 25.25 mL. D) 50.50 mL. Show Answer Correct Answer: C) 25.25 mL. 19. One mole is equal to how many particles (molecules, atoms)? A) 6.02 x 10$^{24}$. B) 6.02 x 10$^{23}$. C) 6.02 x 10$^{25}$. D) 6.02 x 10$^{26}$. Show Answer Correct Answer: B) 6.02 x 10$^{23}$. 20. How many atoms of carbon are in 6.00 g of carbon? A) 1.20x10$^{24 }$atoms C. B) 6.02x10$^{23 }$atoms C. C) 3.01x10$^{23 }$atoms C. D) 1.50x10$^{23 }$atoms C. Show Answer Correct Answer: C) 3.01x10$^{23 }$atoms C. 21. 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) 99.8%. B) 98.9%. C) 97.6%. D) 98.5%. Show Answer Correct Answer: B) 98.9%. 22. State the reducing agent in this reaction.Cu + 4HNO$_{3}$ $\rightarrow$ Cu(NO$_{3}$)$_{2}$ + 2H$_{2}$O + 2NO$_{2}$ A) Cu. B) HNO$_{3}$. C) Cu(NO$_{3}$)$_{2}$. D) NO$_{2}$. Show Answer Correct Answer: A) Cu. 23. When multiplying 2.5 by 1.25, the answer should be reported with: A) 3 significant figures. B) 2 significant figures. C) 4 significant figures. D) 1 significant figure. Show Answer Correct Answer: B) 2 significant figures. 24. Highest Number of atoms are present in A) 4g He. B) 46g Ne. C) 0.40g Ca. D) 12g He. Show Answer Correct Answer: D) 12g He. 25. Determine the molar mass for CCl$_{4}$ A) 153.8 g/mol. B) 47.54 g/mol. C) 189.35 g/mol. D) 82.9 g/mol. Show Answer Correct Answer: A) 153.8 g/mol. Next →Related QuizzesClass 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 10Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books