51. Which of the following is a non-metal?
52. The boiling point of liquid nitrogen is:
53. . . . . . . . . is not a Allotropes of carbon.
54. The molecular mass of O2 is . . . . . . . .
55. Which of the following is not an halogen?
56. . . . . . . . . extinguishes the fire?
57. Match List I with List II.
List-I
List-II
a. Hydrogen was discovered by
1. Priestley
b. The name hydrogen was proposed by
2. Bernard
c. Hydrogen peroxide was discovered by
3. Lavosier
d. Oxygen was discovered by
4. Cavendish
| List-I | List-II |
| a. Hydrogen was discovered by | 1. Priestley |
| b. The name hydrogen was proposed by | 2. Bernard |
| c. Hydrogen peroxide was discovered by | 3. Lavosier |
| d. Oxygen was discovered by | 4. Cavendish |
58. Which of the following gases is a noble gas?
59. The oxygen molecule contains . . . . . . . .
60. Which among the following is an element?
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