| 1 |
_________ shells of noble gases is complete. |
- A. Outer most
- B. 2
- C. 1
- D. Nil
|
| 2 |
The molecular mass of water is |
- A. 16 amu
- B. 14 amu
- C. 18 amu
- D. 20 amu
|
| 3 |
One amu (atomic mass unit) is equivalent to:<br> |
- A. 1.66x10<sup>-24</sup> mg <br>
- B. 1.66x 10<sup>-24</sup>g<br>
- C. 1.66x10 g
- D. 1.66x10<sup>-23</sup>mg<br>
|
| 4 |
The most abundant element occurring in the oceans is:<br> |
- A. Oxygen <br>
- B. Hydrogen <br>
- C. Nitrogen <br>
- D. Silicon <br>
|
| 5 |
Atoms as a whole is _________ |
- A. +
- B. _
- C. No
- D. Neutral
|
| 6 |
Electrons carry _________ charge. |
- A. +
- B. _
- C. Neutral
- D. Bouble Positive
|
| 7 |
Electron _____________ energy when thy jump from higher to lower level. |
- A. Absorb
- B. Radiate
- C. Nothing
- D. Nil
|
| 8 |
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>
|
| 9 |
The smallest under of an ionic compound is |
- A. Atom
- B. Formula unit
- C. Ion
- D. Molecule
|
| 10 |
_________ is an example of substance. |
- A. Carbon
- B. Hydrogrn
- C. Oxygen
- D. Water
|