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Identify the oxidant and the reductant i...

Identify the oxidant and the reductant in the following reactions:
a. `Zn(s)+(1)/(2)O_(2)(g)rarrZnO(s)`
b. `Zn(s)+2H^(o+)(aq)rarrZn^(2+)(aq)+H_(2)(g)`

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The correct Answer is:
To identify the oxidant and reductant in the given reactions, we need to analyze the changes in oxidation states of the elements involved. Let's break down each reaction step by step. ### Reaction a: **Zn(s) + (1/2)O2(g) → ZnO(s)** 1. **Identify the oxidation states:** - In elemental zinc (Zn), the oxidation state is 0. - In zinc oxide (ZnO), zinc has an oxidation state of +2 (since oxygen is -2). 2. **Determine the change in oxidation state:** - Zinc goes from 0 to +2, indicating it is losing electrons (oxidation). - Oxygen in O2 (oxidation state 0) is reduced to -2 in ZnO. 3. **Identify the oxidant and reductant:** - Since zinc is losing electrons, it is the **reductant**. - Oxygen, which is gaining electrons, is the **oxidant**. ### Reaction b: **Zn(s) + 2H⁺(aq) → Zn²⁺(aq) + H2(g)** 1. **Identify the oxidation states:** - In elemental zinc (Zn), the oxidation state is 0. - In zinc ions (Zn²⁺), the oxidation state is +2. - In hydrogen ions (H⁺), the oxidation state is +1. - In molecular hydrogen (H2), the oxidation state is 0. 2. **Determine the change in oxidation state:** - Zinc goes from 0 to +2, indicating it is losing electrons (oxidation). - Hydrogen goes from +1 in H⁺ to 0 in H2, indicating it is gaining electrons (reduction). 3. **Identify the oxidant and reductant:** - Zinc is the **reductant** as it is losing electrons. - Hydrogen ions (H⁺) are the **oxidant** as they are gaining electrons. ### Final Answers: - **Reaction a:** - Oxidant: O2 - Reductant: Zn - **Reaction b:** - Oxidant: H⁺ - Reductant: Zn
To identify the oxidant and reductant in the given reactions, we need to analyze the changes in oxidation states of the elements involved. Let's break down each reaction step by step. ### Reaction a: **Zn(s) + (1/2)O2(g) → ZnO(s)** 1. **Identify the oxidation states:** - In elemental zinc (Zn), the oxidation state is 0. - In zinc oxide (ZnO), zinc has an oxidation state of +2 (since oxygen is -2). ...
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Knowledge Check

  • Identify the oxidant and the reductant respectively in the following reaction. Cl_(2)(g) + 2Br^(-)(aq) to 2Cl^(-)(aq) + Br_(2)(aq)

    A
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    B
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    D
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