| 1 |
The symbol of barium is:<br> |
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| 2 |
The molecular mass of water is |
- A. 16 amu
- B. 14 amu
- C. 18 amu
- D. 20 amu
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| 3 |
It is a triatomic molecule |
- A. Sodium chloride
- B. Water
- C. Chalk
- D. Glucose
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| 4 |
It is heterogeneous mixture |
- A. Sand
- B. Milk
- C. Air
- D. Brass
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| 5 |
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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| 6 |
Elements are represented by chemical _________ |
- A. Abbreviation
- B. Unit
- C. Symbols
- D. It can be represented
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| 7 |
105 elements were discovered by the year ________________ |
- A. 1984
- B. 1974
- C. 1086
- D. 1996
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| 8 |
Polyatomic molecules consist of _________ atoms. |
- A. 1
- B. More than 1
- C. Less than 1
- D. 2
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| 9 |
Electron _____________ energy when thy jump from higher to lower level. |
- A. Absorb
- B. Radiate
- C. Nothing
- D. Nil
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| 10 |
The smallest under of an ionic compound is |
- A. Atom
- B. Formula unit
- C. Ion
- D. Molecule
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