| 1 |
The atomic number of sodium is ............... . |
|
| 2 |
A _________ is a pure substance is made up of two or more elements. |
- A. Mixture
- B. Elements
- C. Solution
- D. Compound
|
| 3 |
All chemists invented all except: |
- A. Beakers
- B. Spirit lamp
- C. Funnels
- D. Retorts
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| 4 |
105 elements were discovered by the year ________________ |
- A. 1984
- B. 1974
- C. 1086
- D. 1996
|
| 5 |
Neutrons have _________ charge. |
|
| 6 |
_____________ revolves in orbits around nucleus. |
- A. Electron
- B. Proton
- C. Neutrons
- D. Nil
|
| 7 |
Sort out a compound from the following |
- A. Air
- B. Salt
- C. Ice-cream
- D. Iron
|
| 8 |
Electron _____________ energy when thy jump from higher to lower level. |
- A. Absorb
- B. Radiate
- C. Nothing
- D. Nil
|
| 9 |
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>
|
| 10 |
The period of Alchemists extends from _________ AD. |
- A. 800 to 1800
- B. 600 to 1600
- C. 900 to 1900
- D. 700 to 1700
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