Question

question 5 (2 points) which reaction depicts an reduction occurring? oagno₃ + kbr → agbr + kno₃ onano₃ + kcl → nacl + kno₃ ocl₂ + 2e⁻ → 2 cl⁻ ok → k⁺ + e⁻

Explanation:

Step1: Recall reduction definition

Reduction is gain of electrons.

Step2: Analyze each reaction

• For $\mathrm{AgNO_3}+\mathrm{KBr}\to\mathrm{AgBr}+\mathrm{KNO_3}$ and $\mathrm{NaNO_3}+\mathrm{KCl}\to\mathrm{NaCl}+\mathrm{KNO_3}$, these are double - displacement reactions, no electron transfer.
• For $\mathrm{Cl_2}+2\mathrm{e}^-\to2\mathrm{Cl}^-$, chlorine gains electrons.
• For $\mathrm{K}\to\mathrm{K}^++\mathrm{e}^-$, potassium loses an electron (oxidation).

Answer:

$\mathrm{Cl_2}+2\mathrm{e}^-\to2\mathrm{Cl}^-$