Write the balanced equations for extraction of silver from glance by cyanide process.

Explanation

To write the balanced equations for the extraction of silver from glance (argentite, Ag2S) using the cyanide process, we will follow these steps:

### Step 1: Write the reaction of argentite with sodium cyanide
The first step involves treating the ore (Ag2S) with sodium cyanide (NaCN). This forms a complex known as sodium argento-cyanide.

**Unbalanced Equation:**
\[ \text{Ag}_2\text{S} + \text{NaCN} \rightarrow \text{Na}_2\text{Ag(CN)}_2 + \text{Na}_2\text{S} \]

...