Ag`CI` dissolves in excess of `KCN` solution to give the ____complex compound .

Explanation

To solve the question regarding the dissolution of AgCl in excess KCN solution and the formation of a complex compound, we can follow these steps:

### Step 1: Identify the reactants
We start with silver chloride (AgCl) and potassium cyanide (KCN). The question specifies that KCN is in excess.

**Hint:** Always identify the reactants clearly before proceeding with the reaction.

### Step 2: Write the reaction
When AgCl dissolves in excess KCN, it forms a complex with the silver ion (Ag⁺) and cyanide ions (CN⁻). The reaction can be represented as:
\[ \text{AgCl} + 2 \text{KCN} \rightarrow \text{K}_2[\text{Ag(CN)}_2] + \text{Cl}^- \]

**Hint:** Remember that in coordination compounds, the metal ion typically forms complexes with ligands.

### Step 3: Identify the complex formed
The complex formed is \([Ag(CN)_2]^-\). Since KCN is in excess, we will have two cyanide ions coordinating with the silver ion.

**Hint:** Pay attention to the stoichiometry of the ligands when forming the complex.

### Step 4: Write the complete ionic equation
The complete ionic equation for the reaction can be written as:
\[ \text{Ag}^+ + 2 \text{CN}^- \rightarrow [\text{Ag(CN)}_2]^- \]

**Hint:** This step helps in visualizing how the ions interact to form the complex.

### Step 5: Identify the final compound
The final compound formed is potassium dicyanoargentate(I), which can be represented as:
\[ \text{K}_2[\text{Ag(CN)}_2] \]

**Hint:** The naming of the compound is crucial; it reflects both the ligands and the oxidation state of the metal.

### Step 6: Naming the complex
The name of the complex is derived from the cation (K⁺) and the anionic complex. The complex is named as potassium dicyanoargentate(I).

**Hint:** When naming coordination compounds, start with the cation, followed by the ligands, and then the metal with its oxidation state.

### Final Answer
Thus, the complex compound formed when AgCl dissolves in excess KCN solution is **Potassium Dicyanoargentate(I)**.