This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 1 Some Basic Concepts Of Chemistry Quiz 12 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What was the slides mainly explaining about? A) About chemistry. B) About medicines. C) About chemistry in medicines. D) About physics. Show Answer Correct Answer: C) About chemistry in medicines. 2. Mass of 1 atom (in gms) is known as A) Atomic mass. B) Molecular mass. C) Molar mass. D) None of the above. Show Answer Correct Answer: C) Molar mass. 3. What will be the value of 100 micro m x 100 micro m x 0.1 mm A) 10$^{-3}$ mm$^{3}$. B) 10$^{-6}$ mm$^{3}$. C) 10$^{-9}$ mm$^{3}$. D) 10$^{-7}$mm$^{3}$. Show Answer Correct Answer: A) 10$^{-3}$ mm$^{3}$. 4. The majority of an atom's mass exists where? A) In the nucleus. B) In the electron cloud. C) In the space between the nucleus and the electrons. D) In the neutrons. Show Answer Correct Answer: A) In the nucleus. 5. The oxidation number of oxygen in peroxide A) -2. B) -1. C) 0. D) +2. Show Answer Correct Answer: B) -1. 6. L at STP is known as A) Volume. B) Equivalent volume. C) Molar mass. D) Molar volume. Show Answer Correct Answer: D) Molar volume. 7. How many atoms of magnesium are present in 96u of Magnesium A) 0.25. B) 25. C) 4. D) 0.4. Show Answer Correct Answer: C) 4. 8. Which of the following is isoelectronic with Ca$^{2+}$ A) Fe$^{3+}$. B) S$^{2-}$. C) Mg$^{2+}$. D) P. Show Answer Correct Answer: B) S$^{2-}$. 9. This law states that energy cannot be created or destroyed, but it can change form. A) Endothermic reaction. B) Law of Conservation of EnergyLOCOE. C) Exothermic reaction. D) Law of Conservation of MatterLOCOM. Show Answer Correct Answer: B) Law of Conservation of EnergyLOCOE. 10. A mixture of Ammonium chloride and iodine can be separated by A) Fractional crystallization. B) Extraction with water. C) Sublimation. D) Chromatography. Show Answer Correct Answer: B) Extraction with water. 11. If the density of a solution is 4.5g/mL, the mass of 1.4mL solution in significant figure is A) 3.21g. B) 4.5g. C) 0.63g. D) 6.3g. Show Answer Correct Answer: D) 6.3g. 12. One mole of oxygen gas at STP is equal A) 1.6 g of oxygen. B) 32 g of oxygen. C) 6.022 x 10$^{23}$ molecules of oxygen. D) 6.022 x 10$^{23}$ atoms of oxygen. Show Answer Correct Answer: C) 6.022 x 10$^{23}$ molecules of oxygen. 13. A ..... is a pure substance that is composed of only one type of atom? A) Element. B) Mixture. C) Compound. D) Particulate. Show Answer Correct Answer: A) Element. 14. How many grams of glucose are needed to prepare 400mL of 5% glucose solution? A) 5g. B) 10g. C) 14g. D) 20g. Show Answer Correct Answer: D) 20g. 15. Anything that takes up space and has mass is known as ..... A) Matter. B) Molecules. C) Compounds. D) Stuff. Show Answer Correct Answer: A) Matter. 16. Atomicity of phosphorus is A) 1. B) 2. C) 4. D) 3. Show Answer Correct Answer: C) 4. 17. Number of significant figures in 12.6 X 11.2 are: A) 6. B) 3. C) 4. D) 2. Show Answer Correct Answer: B) 3. 18. Molecular mass of ammonia A) 12. B) 13. C) 14. D) 17. Show Answer Correct Answer: D) 17. 19. Which of the following paramagnetic in nature A) Carbon freeradical. B) Carbocation. C) Carbanion. D) Nitene. E) 1. Show Answer Correct Answer: A) Carbon freeradical. 20. 1L is NOT equal to A) 10 dm$^{3}$. B) 10$^{3 }$cm$^{3}$. C) 10$^{-3 }$m$^{3}$. D) 1000mL. Show Answer Correct Answer: A) 10 dm$^{3}$. 21. What is the empirical formula for thr compound, C$_{x}$H$_{y}$O$_{z}$, if the ratio C:H:O equal to 2:2.5:1 A) C$_{2}$H$_{2}$O$_{1}$. B) C$_{2}$H$_{5}$O$_{1}$. C) C$_{4}$H$_{5}$O$_{2}$. D) C$_{3}$H$_{2}$O$_{2}$. Show Answer Correct Answer: C) C$_{4}$H$_{5}$O$_{2}$. 22. The molarity of sugar solution where 20 g sugar is dissolved to make 2 L solution is: A) 0.027 mol/L. B) 0.055 mol/L. C) 0.11 mol/L. D) 0.22 mol/L. Show Answer Correct Answer: A) 0.027 mol/L. 23. If the density of methanol is 0.793 kg L$^{-1}$, what is its volume needed for making 2.5L of its 0.25 M solution? A) 25.22 mL. B) 24.55 mL. C) 25.33 mL. D) 24.22 mL. Show Answer Correct Answer: A) 25.22 mL. 24. Which of the following statements about significant figures is TRUE? A) Counting numbers like 2 or 20 have a fixed number of significant figures. B) In numbers written in scientific notation, only digits before the decimal point are significant. C) Counting numbers such as 2 balls have infinite significant figures because they are exact numbers. D) Zeros at the end of a number without a decimal are always significant. Show Answer Correct Answer: C) Counting numbers such as 2 balls have infinite significant figures because they are exact numbers. 25. What are the possible values of the magnetic quantum number for an electron in a 3p orbital? A) -3, -2, -1, 0, +1, +2, +3. B) -2, -1, 0, +1, +2. C) -1, 0, +1. D) 0. 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