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| 1 | |
What are the oxidation numbers of hydrogen and chlorine in HCl, respectively? |
| | A) | +1, -1 |
| | B) | -1, +1 |
| | C) | -2, +2 |
| | D) | +2, -2 |
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| 2 | |
What is the oxidation number of As in AsO43-? |
| | A) | +5 |
| | B) | -5 |
| | C) | -4 |
| | D) | +4 |
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| 3 | |
What are the oxidation numbers of chromium, oxygen, and hydrogen in Cr(OH)3, respectively? |
| | A) | +1, -1, 0 |
| | B) | +3, -2, +1 |
| | C) | -3, +1, -2 |
| | D) | -1, +1, 0 |
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| 4 | |
What is the sum of the oxidation numbers of all of the atoms in BrO3-? |
| | A) | 0 |
| | B) | -1 |
| | C) | -2 |
| | D) | -3 |
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| 5 | |
In the reaction below, what happens to the oxidation number of iron?
Fe(s) + Cu2+(aq) à Fe2+(aq) + Cu(s) |
| | A) | It increases by 2. |
| | B) | It decreases by 2. |
| | C) | It does not change. |
| | D) | It increases by 1. |
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| 6 | |
In the reaction below, what happens to the oxidation number of sodium?
2Na(s) + Cl2(g)à 2NaCl(s) |
| | A) | It increases by 2. |
| | B) | It decreases by 2. |
| | C) | It does not change. |
| | D) | It increases by 1. |
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| 7 | |
What is true if an element's oxidation number changes from 0 to -2 in a redox reaction? |
| | A) | That element has been reduced. |
| | B) | That element has been oxidized. |
| | C) | The equation has not been balanced. |
| | D) | The reaction is not a redox reaction. |
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| 8 | |
What is true if the oxidation number of elements do not change in a reaction? |
| | A) | The reaction is a redox reaction. |
| | B) | The reaction is not a redox reaction. |
| | C) | The reaction involves oxidation but not reduction. |
| | D) | The reaction involves reduction but not oxidation. |
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