Identify the oxidation-reduction reactions among the following:
1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
2. 2Na(s) + Cl2(aq) → 2NaCl(s)
3. 2Mg(s) + O2(g) → 2MgO
Identify the oxidation-reduction reactions among the following:
1 and 2 only
2 and 3 only
1 and 3 only
All of 1, 2, and 3
None of 1, 2, and 3
To determine the oxidation-reduction reactions among the given equations, we need to identify the changes in oxidation states of the elements involved.
1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
In this equation, Zn is oxidized from 0 to +2, while Cu2+ is reduced from +2 to 0. So, this is an oxidation-reduction reaction.
2. 2Na(s) + Cl2(aq) → 2NaCl(s)
In this equation, Na is oxidized from 0 to +1, while Cl2 is reduced from 0 to -1. So, this is also an oxidation-reduction reaction.
3. 2Mg(s) + O2(g) → 2MgO
In this equation, Mg is oxidized from 0 to +2, while O2 is reduced from 0 to -2. So, this is another oxidation-reduction reaction.
Therefore, the correct answer is "All of 1, 2, and 3."
To identify the oxidation-reduction reactions among the given reactions, we need to determine if there is a transfer of electrons between the elements involved.
In an oxidation-reduction reaction, also known as a redox reaction, one species loses electrons (undergoes oxidation) while another species gains electrons (undergoes reduction).
1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
In this reaction, Zn loses two electrons to form Zn2+ (oxidation) while Cu2+ gains two electrons to form Cu (reduction). Therefore, this reaction is an oxidation-reduction reaction.
2. 2Na(s) + Cl2(aq) → 2NaCl(s)
In this reaction, Na loses one electron to form Na+ (oxidation) while Cl2 gains two electrons to form 2Cl- (reduction). Therefore, this reaction is also an oxidation-reduction reaction.
3. 2Mg(s) + O2(g) → 2MgO
In this reaction, Mg loses two electrons to form 2Mg2+ (oxidation), but O2 does not gain any electrons. This reaction does not involve a transfer of electrons and is not an oxidation-reduction reaction.
Based on the analysis above, the oxidation-reduction reactions among the given reactions are 1 and 2 only. Therefore, the correct answer is "1 and 2 only".
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