C-100 Practice Multiple Choice Question Set 4
| 1. The pH of a 1 molar solution of a weak acid with a Ka = 10-10 will be... | ||
| (a) | 2.5 | |
| (b) | 5 | |
| (c) | 10 | |
| (d) | Yikes! This question is lowering the pH of my stomach. | |
| 2. What is the oxidation number of chromium in the ionic compound Na2Cr2O7? | ||
| (a) | 2 | |
| (b) | 6 | |
| (c) | 7 | |
| (d) | 12 | |
| 3. Which Brønsted acid (H2O or H2S (aq)) is the stronger acid and why is it the stronger acid? | ||
| (a) | H2O is the stronger acid because oxygen has a greater electronegativity than sulfur, which gives the attached hydrogen atom more proton character. | |
| (b) | H2O is the stronger acid because H2S is a gas and gases are not acids. | |
| (c) | H2S is the stronger acid because the hydrogen-sulfur bond is much weaker than the hydrogen-oxygen bond due to a greater difference in atomic orbital energy levels. | |
| (d) | H2S is the stronger acid because it is a heavier molecule and therefore has more energetic collisions. | |
| 4. Which Brønsted acid (HCl (aq) or H2S (aq)) is the stronger acid and why is it the stronger acid? | ||
| (a) | HCl is the stronger acid because it is a better proton donor. | |
| (b) | HCl is the stronger acid because the hydrogen-chlorine bond is much weaker than the hydrogen-sulfur bond due to a greater difference in atomic orbital energy levels. | |
| (c) | HCl is the stronger acid because chlorine has a greater electronegativity than sulfur, which gives the attached hydrogen atom more proton character. | |
| (d) | H2S is twice as strong an acid as HCl because it has two acidic hydrogen atoms versus only one hydrogen atom in HCl. | |
| 5. Which is the oxidation number of nitrogen in the molecule N2? | ||
| (a) | 0 | |
| (b) | 3 | |
| (c) | 5 | |
| (d) | 7 | |
| 6. Which of the following compounds is the strongest Brønsted acid? | ||
| (a) | H2SO4 | |
| (b) | HC2H3O2 | |
| (c) | HNO3 | |
| (d) | H3PO4 | |
| 7. Which of the following compounds is the strongest Brønsted base? | ||
| (a) | NaHSO4 | |
| (b) | NaC2H3O2 | |
| (c) | NaNO3 | |
| (d) | NaH2PO4 | |
| 8. Which of the following compounds is the strongest Brønsted base? | ||
| (a) | NaCH3 | |
| (b) | NaOH | |
| (c) | NaF | |
| (d) | NaNH2 | |
| 9. Which of the following compounds is the strongest Brønsted acid? | ||
| (a) | NH3 | |
| (b) | HF | |
| (c) | H2O | |
| (d) | CH4 | |
| 10. Which of the following chemical equations correctly represents the reaction between aluminum and oxygen? | ||
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| 11. Which of the following chemical equations correctly represents the reaction between calcium hydroxide and hydrochloric acid? | ||
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| 12. In the following
reaction, the element that is oxidized is _?_ and the element that is the
oxidizing agent is _?_.
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| (a) | zinc...zinc | |
| (b) | bromine...bromine | |
| (c) | zinc...bromine | |
| (d) | bromine...zinc | |
| 13. Which of the following chemical equations correctly represents the reaction between sodium carbonate and phosphoric acid? | ||
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| 14. Which of the following compounds is the strongest Brønsted acid? | ||
| (a) | HCl | |
| (b) | HBr | |
| (c) | H2O | |
| (d) | H2S | |
Copyright © August 2000 by Richard C. Banks...all rights reserved.
