
Interpretation: The oxygen−reduction reaction needs to be identified.
Concept introduction: Oxidation state is the concept which explains the gain or loss of electrons in oxidation−reduction reactions.

Answer to Problem 3STP
Correct option is C.
Explanation of Solution
C.
The given reaction is as follows:
HCl(aq)+NaOH(aq)→NaCl(aq)+H2O(l)
In this reaction, there is no change in oxidation states of any element. Thus this reaction is not an oxidation-reduction reaction.
A. 2Al(s)+3I2(s)→2AlI3(s)
In this reaction, oxidation state of aluminum increases and oxidation state of iodine decreases. Iodine is reduced and aluminium is oxidized. Thus this is an oxidation reduction reaction.
B. Mg(s)+2HCl(s)→MgCl2(aq)+H2(g)
In this reaction, oxidation state of magnesium increases and oxidation state of hydrogen decreases. Hydrogen is reduced and magnesium is oxidized. Thus, this is an oxidation reduction reaction.
D. CH4(g)+2O2(g)→CO2(g)+H2O(l)
In this reaction, oxidation state of carbon increases and oxidation state of oxygen decreases. Oxygen is reduced and carbon is oxidized. Thus this is an oxidation reduction reaction.
Chapter 18 Solutions
World of Chemistry
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