
(a)
Interpretation: From the given reaction, the element that is oxidized and reduced needs to be determined.
Concept introduction: A
(a)

Answer to Problem 5RQ
Iron is oxidized and oxygen is reduced.
Explanation of Solution
Given reaction is as follows:
In this reaction, oxidation state of Fe increases from 0 to +3 and oxidation state of oxygen decreases form 0 to -2. Thus, iron is oxidized and oxygen is reduced.
(b)
Interpretation: From the given reaction, the element that is oxidized and reduced needs to be determined.
Concept introduction: A chemical reaction which involves transfer of electron is redox or oxidation-reduction reaction. Oxidation state is the charge assigned to an atom in a compound. Oxidation-reduction reaction involves gain and loss of electrons from atoms.
(b)

Answer to Problem 5RQ
Zinc is oxidized and silver is reduced.
Explanation of Solution
Given reaction is as follows:
In this reaction, oxidation state of Zn increases from 0 to +2 and oxidation state of Ag decreases form +1 to 0. Thus, Zn is oxidized and Ag is reduced.
(c)
Interpretation: From given reaction, the element that is oxidized and reduced needs to be determined.
Concept introduction: A chemical reaction which involves transfer of electron is redox or oxidation-reduction reaction. Oxidation state is the charge assigned to an atom in a compound. Oxidation-reduction reaction involves gain and loss of electrons from atoms.
(c)

Answer to Problem 5RQ
Potassium is oxidized and chlorine is reduced.
Explanation of Solution
Given reaction is as follows:
In this reaction, oxidation state of potassium increases from 0 to +1 and oxidation state of chlorine decreases form 0 to -1. Thus potassium is oxidized and chlorine is reduced.
(d)
Interpretation: From given reaction, the element that is oxidized and reduced needs to be determined.
Concept introduction: A chemical reaction which involves transfer of electron is redox or oxidation-reduction reaction. Oxidation state is the charge assigned to an atom in a compound. Oxidation-reduction reaction involves gain and loss of electrons from atoms.
(d)

Answer to Problem 5RQ
Calcium is oxidized and oxygen is reduced.
Explanation of Solution
Given reaction is as follows:
In this reaction, oxidation state of Ca increases from 0 to +2 and oxidation state of oxygen decreases form 0 to -2. Thus, calcium is oxidized and oxygen is reduced.
Chapter 18 Solutions
World of Chemistry
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