Dalton's atomic theory and concept of atom molecule element and compound - One Line Questions

1. Dalton's atomic theory was proposed in the year: — 1808
2. Dalton's theory postulated that atoms combine in a chemical reaction in: — Simple whole number ratios
3. The concept of 'atom' in ancient Greek philosophy was proposed by: — Democritus
4. The smallest particle of a compound that retains all its chemical properties is called a(n): — Molecule
5. The smallest unit of matter that exhibits the properties of a substance is: — Molecule
6. What is the fundamental unit of a chemical compound? — Molecule
7. Which of the following postulates of Dalton's atomic theory was later modified by the discovery of isotopes? — Atoms of a given element are identical in all respects.
8. What is the fundamental difference between an atom and a molecule of an element? — Atoms are the smallest unit, molecules are formed by atoms.
9. The discovery of the electron by J.J. Thomson in 1897 indicated that: — Atoms are composed of smaller particles.
10. What did Dalton propose about the conservation of atoms during a chemical reaction? — Atoms can be rearranged but not created or destroyed.
11. Dalton's atomic theory states that atoms of different elements: — Are different in mass and chemical properties
12. Which of the following is NOT an element? — Glucose
13. Which of the following elements has atoms that are identical in mass and chemical properties according to Dalton's theory? — Iron and Iron
14. Which of the following is a characteristic of a compound? — Components are chemically bonded in a fixed ratio.
15. A substance that cannot be broken down into simpler substances by chemical means is called a(n): — Element
16. If two elements form compounds A and B, and the mass of element Y combining with a fixed mass of element X in compound A is double the mass of element Y combining in compound B, this illustrates the Law of: — Multiple Proportions
17. The term 'molecule' was first introduced by: — Avogadro
18. The concept of 'element' as a fundamental substance was established by: — Lavoisier
19. A substance formed when two or more different chemical elements are chemically bonded together is known as a(n): — Compound
20. A substance that is composed of two or more substances physically mixed together is called a(n): — Mixture
21. A substance whose composition can vary is a(n): — Mixture
22. Which of the following is a molecular formula? — H₂O
23. According to Dalton's atomic theory, atoms of a given element are: — Identical in all respects
24. Dalton's atomic theory explains the formation of compounds based on the principle of: — Combination of atoms in simple whole number ratios
25. Dalton's atomic theory was a landmark in chemistry because it: — Provided a quantitative basis for understanding chemical reactions.
26. Which of the following is an example of a compound? — Ammonia (NH₃)
27. What is the primary role of Dalton's atomic theory in the development of chemistry? — It established the atomic basis of chemistry.
28. Which of the following is a limitation of Dalton's atomic theory? — It cannot explain the existence of isotopes.
29. Which law is directly supported by Dalton's postulate that atoms combine in simple whole number ratios? — Law of Multiple Proportions
30. The law that states that when two elements can combine to form more than one compound, the ratios of the masses of the second element which combine with a fixed mass of the first element are in simple whole numbers is: — Law of Multiple Proportions
31. The ratio of masses of hydrogen and oxygen in water (H₂O) is fixed. This supports the: — Law of Definite Proportions
32. Which of the following is a pure substance? — Sugar
33. According to Dalton, the smallest unit of matter that retains its chemical identity is the: — Atom
34. What is the smallest particle of an element that can exist independently and retain all its chemical properties? — Atom
35. The chemical symbol 'O' represents a(n): — Atom of oxygen
36. What are the building blocks of elements according to Dalton's atomic theory? — Atoms
37. Dalton's theory proposed that all matter is composed of: — Atoms
38. Which of the following statements about molecules is NOT consistent with Dalton's atomic theory? — Molecules are the smallest particles that can exist independently.
39. In a mixture, the components retain their: — Original properties
40. Which postulate of Dalton's atomic theory states that atoms cannot be created or destroyed in a chemical reaction? — Postulate 3
41. Which of the following is a subatomic particle that contradicts Dalton's idea of indivisible atoms? — All of the above
42. The term 'atomos' from which 'atom' is derived, means: — Indivisible
43. Dalton's atomic theory successfully explained: — The laws of chemical combination
44. According to Dalton's theory, atoms of different elements differ in: — Their mass and chemical properties
45. According to Dalton's theory, what happens to the atoms of one element when they combine with atoms of another element? — They are rearranged to form compounds.
46. In a compound, the elements are present in a fixed ratio by: — Mass
47. The Law of Definite Proportions states that a given chemical compound always contains its component elements in a fixed ratio by: — Weight
48. Which of the following is an example of an element? — Oxygen (O₂)
49. Which of the following is an example of a mixture? — Air
50. Which of the following is an example of a compound that violates the concept of atoms being indivisible? — Radioactive isotopes like Uranium-235
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