| 1 |
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>
|
| 2 |
Atoms as a whole is _________ |
- A. +
- B. _
- C. No
- D. Neutral
|
| 3 |
Polyatomic molecules consist of _________ atoms. |
- A. 1
- B. More than 1
- C. Less than 1
- D. 2
|
| 4 |
Which one an example of heterogeneous mixture? |
- A. Ice cream
- B. Concrete
- C. Both a & b
- D. NiL
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| 5 |
How many numbers of moles are equivalent to 8 grams of CO<sub>2</sub>?<br> |
- A. 0.15
- B. 0.18
- C. 0.21
- D. 0.24
|
| 6 |
The molar mass of H<sub>2</sub>SO<sub>4</sub> is:<br> |
- A. 98 g
- B. 98 amu<br>
- C. 9.8 g <br>
- D. 9.8 amu<br>
|
| 7 |
The equation of relationship between atomic number (Z) and mass number (A) is |
- A. A = Z + N
- B. A = Z - n
- C. A = Z
- D. A =2Z + n
|
| 8 |
One mole of sodium = ______ . |
- A. 24 g
- B. 25 g
- C. 26 g
- D. 23 g
|
| 9 |
Potassium's atomic no. is : |
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| 10 |
Scientist used ___________ method. |
- A. Scientific
- B. Non-scientific
- C. Bot
- D. Non
|