| 1 |
The mass of one molecule of water is:<br> |
- A. 18 amu
- B. 18g
- C. 18mg
- D. 18kg
|
| 2 |
Which one is largest? |
- A. Exo
- B. Peta
- C. Atto
- D. Pico
|
| 3 |
The most abundant element occurring in the oceans is:<br> |
- A. Oxygen <br>
- B. Hydrogen <br>
- C. Nitrogen <br>
- D. Silicon <br>
|
| 4 |
Number of protons+ neutrons is : |
- A. Atomic mass
- B. Mass numbers
- C. Both
- D. Nil
|
| 5 |
The number of proton in an atom is called _________ number. |
- A. Molecule
- B. Formula
- C. Atomic
- D. Molar
|
| 6 |
_________ can be separated by physical means. |
- A. Mixture
- B. Compound
- C. Solution
- D. Nil
|
| 7 |
The formula of benzene is _________ |
- A. C6H6O3
- B. C6H6
- C. C12H22
- D. Nil
|
| 8 |
Which one of the following pair has the same mass?<br> |
- A. 1 mole of CO and 1 mole of N<sub>2</sub><br>
- B. 1 mole of CO and 1 mole of CO<sub>2</sub>
- C. 1 mole of O<sub>2</sub> and 1 mole of N<sub>2</sub>
- D. 1 mole of O<sub>2</sub> and 1 mole of CO<sub>2</sub>
|
| 9 |
_________ elements naturally occurring. |
- A. 92
- B. 118
- C. 93
- D. 117
|
| 10 |
Amadeo Avogadro was a _______________ scientist. |
- A. Italian
- B. English
- C. Greek
- D. Russian
|
