| 1 |
Tin has isotopes. |
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| 2 |
Many element have fractional atomic masses. This is because. |
- A. the mass of the atom is itself fractional
- B. Atomic masses are average mases of Isobars
- C. Atomic masses are average masses Isotopes
- D. Atomic masses are average masses of Isotopes proportional to their relative abundance.
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| 3 |
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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| 4 |
Which statement is incorrect about 64 g of SO2. |
- A. It is one mole SO2
- B. The number of SO2 molecule are 6.02 x 10<sup>23</sup>
- C. The number of oxygen atoms are 6.02 x 10<sup>23</sup>
- D. The number sulphur atom are 6.02 x 10<sup>23</sup>
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| 5 |
In stoichiometric calculations |
- A. The reaction can be reversile
- B. Side products can be formed
- C. Law of conservation of mass may not be obeyed
- D. Law of definite proportions is definitely obeyed
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| 6 |
The number of H2O molecules in 9 grams of ice is |
- A. 3.01 x 10<sup>23</sup>
- B. 6.02 x 10<sup>23</sup>
- C. 6.02 x 10<sup>8</sup>
- D. 12.04 x 10<sup>23</sup>
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| 7 |
The mass of two moles of electrons is |
- A. 1.10 mg
- B. 1.008 mg
- C. 0.184 mg
- D. 1.673 mg
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| 8 |
Which statement about a molecule is incorrect. |
- A. It exist independently
- B. Molecules of a substances are similar
- C. Hemoglobin is a homoatomic molecules
- D. Oxygen molecule is a macromolecule
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| 9 |
the number of Al<sup>3+</sup> ion sin AlCl<sub>3</sub>is 2.007 x 10<sup>23</sup>. The number of Cl- ions are. |
- A. 6.02 x 10<sup>23</sup>
- B. 3.01 x 10<sup>23</sup>
- C. 3.01 x 10<sup>23</sup>
- D. 1.5 x 10<sup>23</sup>
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| 10 |
During combustion analysis, CO2 produced is absorbed in |
- A. Mg (CLO4)2
- B. 50% KOH
- C. CaCl2
- D. P2O5
|