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Consider the observation summarized below.
The wet filter paper containing the precipitate was transferred to a beaker. The filter paper was carefully rested against the inner upright beaker wall. The precipitate was dissolved by spritzing a reagent from a disposable pipette. The filter paper was rinsed multiple times with the resulting solution to ensure complete removal and dissolution of the precipitate. A clear, emerald green solution was obtained at the end of this step.
Which stage of the copper reaction cycle best fits the description? (A) Dissolution of elemental to produce aqueous (₃)₂ and gaseous ₂ (B) Precipitation of (H)₂ from aqueous (₃)₂ upon addition of sufficient aqueous NaOH (C) Neutralization of (H)₂ upon the addition of aqueous H to produce aqueous ₂ (D) Isolation of elemental from aqueous ₂ in the presence of aqueous H and elemental
Sagot :
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