Multiple Choice
Considering the redox reaction Cr + Ni²⁺ → Cr³⁺ + Ni, how many electrons are transferred in the balanced reaction?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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What element is undergoing reduction in the following reaction? Zn(s) + 2 AgNO3(aq) → Zn(NO3)2(aq) + 2 Ag(s)
A
Zinc (Zn)
B
Nitrogen (N)
C
Silver (Ag)
D
Oxygen (O)
Verified step by step guidance1
Identify the oxidation states of each element in the reactants and products. For example, in Zn(s), the oxidation state of Zn is 0, and in Zn(NO3)2, the oxidation state of Zn is +2.
Determine the oxidation state of Ag in AgNO3. In AgNO3, Ag has an oxidation state of +1.
Determine the oxidation state of Ag in the products. In the product 2 Ag(s), the oxidation state of Ag is 0.
Compare the oxidation states of Ag in the reactants and products. Notice that the oxidation state of Ag changes from +1 in AgNO3 to 0 in Ag(s).
Conclude that the element undergoing reduction is the one whose oxidation state decreases. Since the oxidation state of Ag decreases from +1 to 0, Ag is the element undergoing reduction.
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