This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry Basics > Chemistry – Quiz 23 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 23 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which type of element is shiny, ductile and malleable? A) Metal. B) Nonmetal. C) Metalloid. D) Play dough. Show Answer Correct Answer: A) Metal. 2. Which of the following are sources of biomass to replace natural gas as the feedstock of many industrial processes? (1) Seaweed from large-scale farming (2) Waste paper from schools and offices (3) Methane gas from landfill sites A) And (2) only. B) And (3) only. C) And (3) only. D) , (2) and (3). Show Answer Correct Answer: D) , (2) and (3). 3. Mol dm-3 aqueous solution of acid W has a pH of 4.5. Which of the following statements is true for acid W? A) Acid W has a high degree of dissociation in water. B) Acid W has a high melting point. C) Aqueous solution of acid W has a low concentration ofhydrogen ions. D) Acid W is a diprotic acid. Show Answer Correct Answer: C) Aqueous solution of acid W has a low concentration ofhydrogen ions. 4. What is made up two or more elements that are chemically combined? A) Element. B) Mixture. C) Compound. D) Solids. Show Answer Correct Answer: C) Compound. 5. The mass exactly equal to $ \frac{1}{12}th$ the mass of $ C-12$ atom is called ..... A) Weight. B) Atomic mass. C) Relative atomic mass. D) None of above. Show Answer Correct Answer: C) Relative atomic mass. 6. Examples of these biomolecules are DNA and RNA ..... A) Nucleic Acids. B) Carbohydrates. C) Lipids. D) Proteins. Show Answer Correct Answer: A) Nucleic Acids. 7. What is the chemical formula of an alkene that has 3 carbon atoms? A) C3H2. B) C3H4. C) C3H6. D) C3H8. Show Answer Correct Answer: C) C3H6. 8. Negatively charged subatomic particles. A) Protons. B) Quarks. C) Neutrons. D) Electrons. Show Answer Correct Answer: D) Electrons. 9. Which scientist is credited with discovering the negatively charge subatomic particles in the atom? A) Neils Bohr. B) J.J. Thompson. C) Ernest Rutherford. D) Dalton. Show Answer Correct Answer: B) J.J. Thompson. 10. Table Sugar (C12H22O11) has how many atoms of hydrogen? A) 12. B) 22. C) 11. D) 45. Show Answer Correct Answer: B) 22. 11. Which of the following is a characteristic of Atomic Packing Factor? A) Fraction of volume in a crystal that is occupied by constituent particles. B) Is dimentionless and always less than unity. C) Determined by assuming that atoms are rigid spheres. D) Everything in the list. Show Answer Correct Answer: D) Everything in the list. 12. Which of the following properties is a physical property? A) Flammability. B) Boiling point. C) Corrosive. D) Reacts with metals. Show Answer Correct Answer: B) Boiling point. 13. Is NaCl an element or compound? A) Element. B) Compound. C) Both. D) None of above. Show Answer Correct Answer: B) Compound. 14. A Mixture is defined as A) A combination of two or more substances that are not chemically combined. B) A combination of compounds that are chemically bonded. C) 2 or more elements chemically bonded. D) None of above. Show Answer Correct Answer: A) A combination of two or more substances that are not chemically combined. 15. How many significant figures are present in 0.0025 A) Two. B) Three. C) Four. D) Five. Show Answer Correct Answer: A) Two. 16. Which of the following would you use to separate mixtures based on their rate of passing through a medium with a solvent present? A) Distillation. B) Chromatography. C) Filtration. D) None of above. Show Answer Correct Answer: B) Chromatography. 17. The state of matter that has no definite size or shape is A) Solid. B) Liquid. C) Gas. D) None of above. Show Answer Correct Answer: C) Gas. 18. Sulphur shows valencies A) 2. B) 4. C) Both. D) None of above. Show Answer Correct Answer: C) Both. 19. Mass percent of phosphorus in calcium phosphate is A) 38.71%. B) 20%. C) 41.29%. D) 28%. Show Answer Correct Answer: B) 20%. 20. Which determines the mass of an element? A) Protons. B) Neutrons. C) Electrons. D) Only Protons and Neutrons. Show Answer Correct Answer: D) Only Protons and Neutrons. ← PreviousNext →Related QuizzesChemistry QuizzesScience QuizzesChemistry Quiz 1Chemistry Quiz 2Chemistry Quiz 3Chemistry Quiz 4Chemistry Quiz 5Chemistry Quiz 6Chemistry Quiz 7Chemistry Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books