When acetylene is treated with ammonical cuprous chloride, a ............ precipitate of ............ is formed.

Explanation

To solve the question, we need to understand the reaction that occurs when acetylene is treated with ammonical cuprous chloride. Here’s a step-by-step breakdown:

### Step 1: Identify the Reactants
- The reactant we are considering is **acetylene**, which is represented by the chemical formula **C₂H₂**.
- The other reactant is **ammonical cuprous chloride**, which can be represented as **Cu₂Cl₂** in the presence of ammonium hydroxide (NH₄OH).

### Step 2: Understand the Reaction
- When acetylene (C₂H₂) reacts with ammonical cuprous chloride (Cu₂Cl₂ in NH₄OH), a specific reaction occurs that leads to the formation of a precipitate.
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