| 1 |
All of the following are tri-atomic molecules except:<br> |
- A. H<sup>2</sup>
- B. O<sup>3</sup>
- C. H<sup>2</sup>O
- D. CO<sup>2</sup>
|
| 2 |
The mass of one molecule of water is:<br> |
- A. 18 amu
- B. 18g
- C. 18mg
- D. 18kg
|
| 3 |
105 elements were discovered by the year ________________ |
- A. 1984
- B. 1974
- C. 1086
- D. 1996
|
| 4 |
Which one of the following element is found in most abundance in the earth's crust?<br> |
- A. Oxygen <br>
- B. Aluminum <br>
- C. Silicon <br>
- D. Iron <br>
|
| 5 |
The symbol of barium is:<br> |
|
| 6 |
The period of Alchemists extends from _________ AD. |
- A. 800 to 1800
- B. 600 to 1600
- C. 900 to 1900
- D. 700 to 1700
|
| 7 |
Which one is largest? |
- A. Exo
- B. Peta
- C. Atto
- D. Pico
|
| 8 |
Amadeo Avogadro was a _______________ scientist. |
- A. Italian
- B. English
- C. Greek
- D. Russian
|
| 9 |
The symbol of lead us |
|
| 10 |
The empirical formula of glucose is |
- A. CHO
- B. CH2O
- C. C2HO
- D. CHO2
|
