This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 21 (16 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. X 10$^{22}$ A) 1 mol. B) 2 mol. C) 0.2 mol. D) 0.1 mol. Show Answer Correct Answer: D) 0.1 mol. 2. How many of the following are elements?O$_{2}$, HCl, PF$_{3}$, H$_{2}$, O$_{3}$, BeCl$_{2}$, I$_{2}$, C, AlCl$_{3, }$SF$_{4}$ A) 8. B) 4. C) 5. D) 10. Show Answer Correct Answer: B) 4. 3. Significant figures refer to: A) All digits in a number. B) Digits that carry meaning contributing to precision of measurement. C) Digits before the decimal point only. D) Digits after the decimal point only. Show Answer Correct Answer: B) Digits that carry meaning contributing to precision of measurement. 4. How many moles are 98.3 grams of aluminum hydroxide, Al(OH)$_{3}$? A) 1.26 moles. B) 0.8 moles. C) 7, 673.4 moles. D) 150 moles. Show Answer Correct Answer: A) 1.26 moles. 5. Which of the following sets of quantum numbers is correct for an electron present in 4f orbital? A) N = 4, l = 3, m = +4, s = +1/2. B) N = 3, l = 2, m =-2, s = +1/2. C) N = 4, l = 3, m = +1, s = +1/2. D) N = 4, l = 4, m =-4, s =-1/2. Show Answer Correct Answer: C) N = 4, l = 3, m = +1, s = +1/2. 6. WHICH OF THE FOLLOWING IS NOT EQUAL TO ONE METRE? A) 10$^{3}$mm. B) 10$^{9}$pm. C) 10$^{15}$fm. D) 10$^{6}$$\mu$m. Show Answer Correct Answer: B) 10$^{9}$pm. 7. On the basis of chemical classification the matter is classified as A) Homogenous and heterogenous. B) Mixture and pure substances. C) Elements and compounds. D) None of the above are correct. Show Answer Correct Answer: B) Mixture and pure substances. 8. What is the mass of 6.02 x 10$^{23 }$platinum atoms? Round to the nearest hundredths place. A) 30.97 g. B) 106.42 g. C) 140.91 g. D) 195.09 g. Show Answer Correct Answer: D) 195.09 g. 9. The concentrated sulphuric acid that is peddled commercially is 95% H$_{2}$SO$_{4}$ by weight. If the density of this commercial acid is 1.834 g cm$^{-3}$, the molarity of this solution is A) 17.8 M. B) 15.7 M. C) 10.5 M. D) 12.0 M. Show Answer Correct Answer: A) 17.8 M. 10. How many significant figures:0.012 km A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 11. Convert 25 g of NaBr to molecules A) 102.96 molecules. B) 0.24 molecules. C) 1.45x10$^{23}$ molecules. D) 2.34 x 10$^{20}$molecules. Show Answer Correct Answer: C) 1.45x10$^{23}$ molecules. 12. Chemical species bearing a negative charge on carbon and possessing eight electrons in its valence shell are called ..... A) Carbocations. B) Carbanions. C) Free radicals. D) None of the above. Show Answer Correct Answer: B) Carbanions. 13. Which of the following is equal to one mA? A) 10$^{-9 }$MA. B) 10$^{-12 }$GA. C) 10$^{-6 }$kA. D) All of the above. Show Answer Correct Answer: D) All of the above. 14. Isotones are A) Elements which have same atomic number but different mass number. B) Elements having same mass number but different atomic number. C) Elements that are having the same number of neutrons. D) None of these are true. Show Answer Correct Answer: C) Elements that are having the same number of neutrons. 15. If 20 litre nitrogen gas reacts with 60 litre hydrogen gas to give ammonia, the volume of product formed is A) 40 Vol. B) 20 Vol. C) 50 Vol. D) 30 Vol. Show Answer Correct Answer: B) 20 Vol. 16. Electrophiles are electron seeking species. Which of the following is an example for an electrophile. A) NH3. B) H2O. C) AlCl3. D) None of the above. Show Answer Correct Answer: C) AlCl3. ← PreviousRelated 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