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
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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
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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