1 |
If four moles of sulphur dioxide are oxidized to sulphur trioxide, how many moles of oxygen are needed. |
- A. 0.5
- B. 1.0
- C. 1.5
- D. 2.0
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2 |
Cadmium has isotopes. |
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3 |
The number of electrons in one mole of hydrogen gas is. |
- A. 6.02 x 10<sup>23</sup>
- B. 12.04 x 10<sup>23</sup>
- C. Only two
- D. Indefinite
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4 |
The smallest collection of ions in an ionic compound is called. |
- A. Formula unit
- B. Chemical formula
- C. Formula mass
- D. Molecular formula
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5 |
The number of moles of CO<sub>2</sub>which contain 8.0 g of oxygen |
- A. 0.25
- B. 0.50
- C. 1.0
- D. 1.50
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6 |
The Number of moles of CO2 which contain 8.0 of oxygen. |
- A. 0.25
- B. 0.15
- C. 0.35
- D. 1.45
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7 |
Calcium has isotopes |
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8 |
The mass fo 1.505 x 10<sup>23</sup>atoms of sulphur is. |
- A. 0.5 g
- B. 0.6 g
- C. 0.7 g
- D. 0.8 g
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9 |
The volume occupied by 1.4 g of N2 at S.T.P is |
- A. 2.24 dm3
- B. 22.4 dm3
- C. 1.12 dm3
- D. 112 cm3
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10 |
More abundant isotope of an element is the one with. |
- A. Even atomic number
- B. Odd atomic number
- C. Even mass number
- D. Odd mass number
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