1. Which of the following scientists discovered the electron in 1897?
2. The mass of an electron is nearly one upon _______ times that of a proton.
3. –––––– are homogeneous mixtures of two or more components ?
4. Which among the following is present inside the nucleus of an atom?
5. Which of the following are metalloids?
6. ____ is the process of allowing particles in suspension in water to settle out of the suspension under the effect of gravity.
7. When did Rutherford published results of gold -foil experiment through which it was noticed that scattering becomes due to presence of rigid core inside nude us of the atom?
8. Which of the following changes CANNOT be reversed?
9. What is the atomic number of chromium?
10. What is approximate value of atomic mass of hydrogen?
11. Which of the following is a heterogeneous mixture?
12. Chemical properties of isotopes ............ ?
13. Which of the following statement is not correct with respect to rutherford's atomic model
14. What is the atomic mass of oxygen (expressed in ‘u’)?
15. A drop of food colouring spreading out in a cup of water is an example of:
16. Which of the following changes occure on heating the camphor?
17. In 1808 which of the following proposed that the combination of two or more different elements form compounds?
18. How many moles are present in 36 gm of water?
19. All isotopes of the same element have --------?
20. What happens when one s and one p orbital is hybridized?
21. What is atomic mass of nitrogen atom?
22. Electron was discovered in the year 1897 by___
23. In the context of isotopes of any element, which of the following statements is not correct?
24. Which of the following elements is a metalloid?
25. Fe has 26 protons in its nucleus. What is the number of electrons in Fe²⁺ (iron II) ion?
26. Which of the following process changes liquids directly into gases (vapour)?
27. By using Vapour distillation technique which kind of substance can be separated?
28. Electrons move around the nucleus in..........…. motion.
29. One mole of an ideal gas occupies a volume of ______ litre at 273 K and 1 atm pressure.
30. Which of the following substance is insoluble in water?
31. What is the atomic mass of oxygen (Which is represented in 'u')?
32. Before 19th century who discovered that each chemical element is made from a unique type of atoms and those atom become different according their atomic mass.
33. In 1904 who discovered plum-pudding model of atom, according to which positive charge is spread over a sphere and electrons are embedded to the positive charge as resins are scattered in plum-pudding?
34. What is the process called when the heavier component settles down after adding water to the mixture?
35. Which of the following is NOT a chemical change?
36. Who proposed that all matters were composed of atoms, that are indivisible and indestructible building blocks?
37. Which of the following is a polar molecule?
38. Who among the following is considered as the 'Father of Modern Atomic Theory'?
39. Which of the following formula is correct?
40. According to Dalton's atomic theory atoms are combined in a certain small whole number ratio to produce ...............
41. In the water cycle, snow and ice get directly converted into vapours. This process is called:
42. The process of transformation of a substance in a gaseous state into a liquid state due to change in pressure or temperature of the substance is called :
43. Who discovered the neutron among the following?
44. How many protons are found in nucleus of Lithium?
45. What is the mass of 4 Moles of aluminium atoms?
46. Atoms of different elements with different atomic numbers, which have the same atomic mass, are known as-
47. In which state of matter kinetic energy of molecules becomes more than force of attraction between them, due to which they lie for apart and become in free motion?
48. Which of the following is NOT positively charged?
49. Using which of the following processes can one separate a solute from its solution?
50. Which of the following property of a proton cannot change while it moves freely in magnetic field?
