1. What is the atomic mass of oxygen (expressed in ‘u’)?
2. Mass of a hydrogen atom is how many times the mass of an electron?
3. How many types of isotopes does Scandium have?
4. Who discovered the neutron and its properties?
5. Which of the following substance is insoluble in water?
6. Which of the following statement is not correct with respect to a mixture?
7. The mass of an electron is nearly one upon _______ times that of a proton.
8. Which of the following statement is not correct with respect to rutherford's atomic model
9. Which of the following changes CANNOT be reversed?
10. Which of the following is used to determine molecular weight of fatly acids.
11. 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?
12. Who proposed that all matters were composed of atoms, that are indivisible and indestructible building blocks?
13. A drop of food colouring spreading out in a cup of water is an example of:
14. What is the molecular mass of nitric acid?
15. What is the process called when the heavier component settles down after adding water to the mixture?
16. What happens when one s and one p orbital is hybridized?
17. One mole of an ideal gas occupies volume of ............ litre at 237 k temperature and 1 atm pressure.
18. How many protons are found in nucleus of Lithium?
19. Which of the following is a chemical change?
20. Atoms of same element having different mass numbers are called…………. ?
21. Chemical properties of isotopes ............ ?
22. How many maximum electrons can be present in third or m-subs heel?
23. What is the mass of 4 Moles of aluminium atoms?
24. Which of the following property of a proton cannot change while it moves freely in magnetic field?
25. Barium loses………. electrons to achieve noble gas electronic configuration?
26. An emulsion is a colloidal solution of
27. Which of the following particles were made to fall on a thin gold foil by Ernest Rutherford?
28. What is the atomic number of chromium?
29. Electrons move around the nucleus in..........…. motion.
30. Which of the following is NOT advisable as a process of separation of components of a mixture?
31. Which among the following is false about alpha particles?
32. Which of the following formula is correct?
33. 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.
34. By using Vapour distillation technique which kind of substance can be separated?
35. Which of the following is NOT positively charged?
36. Atoms of different elements with different atomic numbers, which have the same atomic mass, are known as-
37. One mole of an ideal gas occupies a volume of ______ litre at 273 K and 1 atm pressure.
38. Which of the following is an example of colloidal solution of liquid in solid?
39. 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 :
40. Which of the following are metalloids?
41. The existence of isotopes was first suggested in 1913 by the radiochemist .........?
42. Which one of the following features is not shown by metals?
43. In the context of isotopes of any element, which of the following statements is not correct?
44. Which among the following is a non-metal?
45. The existence of isotopes was first suggested in 1913 by the radiochemist .........
46. Who among the following is considered as the 'Father of Modern Atomic Theory'?
47. Atomic mass of Oxygen is 16 and atomic number is 8. What is the mass (in grams) of 2 moles of oxygen gas?
48. What is the atomic number of nitrogen?
49. Which of the following process changes liquids directly into gases (vapour)?
50. What is the difference between two electrons in an orbit?
