This quiz works best with JavaScript enabled. Home > Science > Chemistry – Quiz 54 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 54 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which scientist described a positively charged core ("nucleus" ) in the middle of a lot of empty space? A) Chadwick. B) Thomson. C) Rutherford. D) Bohr. Show Answer Correct Answer: C) Rutherford. 2. As the temperature goes up, the solubility of all solids in water A) Decreases. B) Increases. C) Remains the same. D) It depends upon the solid. Show Answer Correct Answer: B) Increases. 3. Chemical used in photography is A) Sodium oxalate. B) Sodium sulphite. C) Sodium sulphate. D) Sodium thiosulphate. Show Answer Correct Answer: D) Sodium thiosulphate. 4. What is the smallest 'building block' of the elements that make up the universe? A) An atom. B) An electron. C) A proton. D) A cell. Show Answer Correct Answer: A) An atom. 5. A compound has the formula Al2O3 . What are the correct number of elements in the formula? A) 2 x Aluminium, 3 x oxide. B) 2 x Ammonium, 3 x oxide. C) 2 x Ammonium, 3 x oxygen. D) 2 x aluminium, 3 x oxygen. Show Answer Correct Answer: D) 2 x aluminium, 3 x oxygen. 6. A heterogenous mixture can be separated by all of the methods EXCEPT, A) Filtration. B) Distillation. C) Decantation. D) Mechanical separation. Show Answer Correct Answer: C) Decantation. 7. Which would have a greater mass, 6.02 x 1023 atoms of H or 6.02 x 1023 atoms of He? A) 6.02 x 1023 atoms of H. B) 6.02 x 1023 atoms of He. C) They are the same. D) 6.02 x 1023. Show Answer Correct Answer: B) 6.02 x 1023 atoms of He. 8. Pure substance made up of two or more elements that have been chemically combined ( ionic bond), and have a fixed ratio. A) Mixture. B) Compound. C) Element. D) Molecule. Show Answer Correct Answer: B) Compound. 9. Water drops are spherical because of? A) Density. B) Polarity. C) Viscosity. D) Surface tension. Show Answer Correct Answer: D) Surface tension. 10. Elements that show the properties of both metals and non metals are called? A) Alloys. B) Colloids. C) Allotropes. D) Metalloids. Show Answer Correct Answer: D) Metalloids. 11. Which of the following cannot be broken down by ordinary chemical means? A) Element. B) Bond. C) Molecule. D) Compound. Show Answer Correct Answer: A) Element. 12. The mass of a mole of NaCl is the A) Molar mass. B) Atomic mass. C) Molecular mass. D) Compound mass. Show Answer Correct Answer: A) Molar mass. 13. Science that deals with, matter, its composition, structure and properties, the changes it undergoes, and the energy accompanying the changes between them. A) Chemistry. B) Physics. C) Biology. D) None of above. Show Answer Correct Answer: A) Chemistry. 14. Which of the following can directly affect the movement of particles? A) Heat. B) Temperature. C) Energy. D) Pressure. Show Answer Correct Answer: B) Temperature. 15. Modern Periodic Table me kitne group hain A) 04. B) 18. C) 07. D) 05. Show Answer Correct Answer: B) 18. 16. When comparing a mole of oxygen and a mole of sulfur, how many atoms does each have? A) Oxygen has 16 grams of atoms. B) Sulfur has 32.06 grams of atoms. C) Both contains 6.02 x 1023 atoms. D) Can be determined. Show Answer Correct Answer: C) Both contains 6.02 x 1023 atoms. 17. How many moles of copper are 4.57 x 1013 atoms of copper? A) 7.59 x 10-11 moles. B) 2.75 x 1037 moles. C) 7.59 x 1011 moles. D) 2.75 x 1033 moles. Show Answer Correct Answer: A) 7.59 x 10-11 moles. 18. In the modern periodic table elements are arranged by A) Atomic mass. B) Atomic number. C) Valence electrons. D) Number of isotopes. Show Answer Correct Answer: B) Atomic number. 19. What subatomic particle is negatively charged? A) Electrons. B) Protons. C) Neutrons. D) Solution. Show Answer Correct Answer: A) Electrons. 20. Which of these statements is true of the scientific method? A) The steps may vary somewhat to suit the experiment. B) Working scientists rarely use it. C) Scientists must follow its steps exactly. D) Scientists rarely publish results of experiments. Show Answer Correct Answer: A) The steps may vary somewhat to suit the experiment. ← PreviousNext →Related QuizzesChemistry Quiz 1Chemistry Quiz 2Chemistry Quiz 3Chemistry Quiz 4Chemistry Quiz 5Chemistry Quiz 6Chemistry Quiz 7Chemistry Quiz 8Chemistry Quiz 9Chemistry Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books