Multiple Choice
Which of the following is an example of reduction (as defined by a decrease in oxidation number)?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
Multiple Choice
Which of the following represents an oxidation-reduction reaction?
I. PCl3 (aq) + Cl2 (g) → PCl5 (aq)
II. 2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s)
III. CO2 (g) + 2 LiOH (aq) → Li2CO3 (aq) + H2O (l)
IV. FeCl2 (aq) + 2 NaOH (aq) → Fe(OH)2 (aq) + 2 NaCl (aq)
A
I, II, III, IV
B
I, II and III
C
III
D
I and II
E
IV
Verified step by step guidance1
Step 1: Understand the concept of an oxidation-reduction (redox) reaction. A redox reaction involves the transfer of electrons between two species. It consists of two half-reactions: oxidation (loss of electrons) and reduction (gain of electrons).
Step 2: Analyze reaction I: PCl3 (aq) + Cl2 (g) → PCl5 (aq). Identify the oxidation states of phosphorus and chlorine before and after the reaction. Determine if there is a change in oxidation states, indicating a redox process.
Step 3: Analyze reaction II: 2 AgNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + 2 Ag (s). Identify the oxidation states of silver and copper before and after the reaction. Check for changes in oxidation states to confirm a redox reaction.
Step 4: Analyze reaction III: CO2 (g) + 2 LiOH (aq) → Li2CO3 (aq) + H2O (l). Determine the oxidation states of carbon, lithium, and oxygen before and after the reaction. Verify if there are any changes in oxidation states.
Step 5: Analyze reaction IV: FeCl2 (aq) + 2 NaOH (aq) → Fe(OH)2 (aq) + 2 NaCl (aq). Identify the oxidation states of iron, sodium, and chlorine before and after the reaction. Check for any changes in oxidation states to determine if it is a redox reaction.
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