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3. What is the oxidation number of any element in the free or uncombined state? a. 0 c. -1 b. +1 d. +2 4. What is the sum of the oxidation number of NO₂? a. 0 c. -1 b. +1 d. +2 5. What is the oxidation number of Zinc in ZnH₂? a. 0 C. -1 b. +1 d. +2

3. What is the oxidation number of any element in the free or uncombined state? a. 0 c. -1 b. +1 d. +2 4. What is the sum of the oxidation number of NO₂? a. 0 c. -1 b. +1 d. +2 5. What is the oxidation number of Zinc in ZnH₂? a. 0 C. -1 b. +1 d. +2

World of Chemistry, 3rd edition
World of Chemistry, 3rd edition
3rd Edition
ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Chapter8: Reactions In Aqueous Solutions
Section: Chapter Questions
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3. What is the oxidation number of any element in the free or uncombined state? a. 0 C. -1 b. +1 d. +2 4. What is the sum of the oxidation number of NO₂? a. 0 C. -1 b. +1 d. +2 5. What is the oxidation number of Zinc in ZnH₂? a. 0 c. -1 b. +1 d. +2
Transcribed Image Text:3. What is the oxidation number of any element in the free or uncombined state? a. 0 C. -1 b. +1 d. +2 4. What is the sum of the oxidation number of NO₂? a. 0 C. -1 b. +1 d. +2 5. What is the oxidation number of Zinc in ZnH₂? a. 0 c. -1 b. +1 d. +2
Choose the letter of the correct answer. 1. Which is statement is INCORRECT? a. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. b. Reduction is a process in which an atom gains an electron and therefore decreases (or reduces its oxidation number). c. Oxidation is a process in which an atom gains an electron and therefore increases its oxidation number. d. An electron-donating species which tends to hand over electrons can be referred to as a reducing agent. 2. What chemical process must always accompany a reduction process? a. oxidation c. reduction b. balancing reaction d. half-reaction 3. What is the oxidation number of any element in the free or uncombined state? a. 0 c. -1
Transcribed Image Text:Choose the letter of the correct answer. 1. Which is statement is INCORRECT? a. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. b. Reduction is a process in which an atom gains an electron and therefore decreases (or reduces its oxidation number). c. Oxidation is a process in which an atom gains an electron and therefore increases its oxidation number. d. An electron-donating species which tends to hand over electrons can be referred to as a reducing agent. 2. What chemical process must always accompany a reduction process? a. oxidation c. reduction b. balancing reaction d. half-reaction 3. What is the oxidation number of any element in the free or uncombined state? a. 0 c. -1
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