which equation describes a reduction?\no mg(s)→mg²⁺(aq)+2e⁻\no 2cl + 2e⁻→2cl⁻\no na(s)→na⁺(aq)+e⁻\no…
which equation describes a reduction?\no mg(s)→mg²⁺(aq)+2e⁻\no 2cl + 2e⁻→2cl⁻\no na(s)→na⁺(aq)+e⁻\no al(s)→al³⁺(aq)+3e⁻
Answer
Explanation:
Step1: Recall reduction definition
Reduction is the gain of electrons.
Step2: Analyze each option
- For $\text{Mg}(s)\longrightarrow\text{Mg}^{2 +}(aq)+2e^{-}$, Mg loses 2 electrons, it's oxidation.
- For $2\text{Cl}+2e^{-}\longrightarrow2\text{Cl}^{-}$, Cl gains electrons, it's reduction.
- For $\text{Na}(s)\longrightarrow\text{Na}^{+}(aq)+e^{-}$, Na loses 1 electron, it's oxidation.
- For $\text{Al}(s)\longrightarrow\text{Al}^{3 +}(aq)+3e^{-}$, Al loses 3 electrons, it's oxidation.
Answer:
$2\text{Cl}+2e^{-}\longrightarrow2\text{Cl}^{-}$