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 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 9 (7 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the mass of 6.02 x 10$^{23 }$platinum atoms? Round to the nearest hundredths place. A) 30.97 g. B) 140.91 g. C) 106.42 g. D) 195.09 g. Show Answer Correct Answer: D) 195.09 g. 2. 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) 15.7 M. B) 17.8 M. C) 10.5 M. D) 12.0 M. Show Answer Correct Answer: B) 17.8 M. 3. How many significant figures:0.012 km A) 3. B) 1. C) 2. D) 4. Show Answer Correct Answer: C) 2. 4. Convert 25 g of NaBr to molecules A) 1.45x10$^{23}$ molecules. B) 102.96 molecules. C) 2.34 x 10$^{20}$molecules. D) 0.24 molecules. Show Answer Correct Answer: A) 1.45x10$^{23}$ molecules. 5. 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. 6. 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. 7. 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 QuizzesScience QuizzesClass 11 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 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books