Statement I : Leachig of golds with cyanide ion in absence of air / `O_2` leads to cyano complex of Au(III).
Statement II: Zinc is oxidized during the displacement reaction carried out for gold extraction.
In the light of the above statements, choose the correct answer from the options given below.

Options

A. Both statement I and statement II are correct.
B. Both statement I and statement II is incorrect.
C. Statement I is correct but statement II is incorrect
D. Statement I is incorrect but statement II is correct.

Explanation

To solve the question, we need to analyze both statements provided:

**Statement I:** Leaching of gold with cyanide ion in the absence of air/O₂ leads to the cyano complex of Au(III).

**Statement II:** Zinc is oxidized during the displacement reaction carried out for gold extraction.

### Step-by-Step Solution:

1. **Understanding Leaching of Gold:**
- Leaching is a process where gold is extracted from its ore using cyanide ions. The general reaction for gold leaching in the presence of oxygen is:
\[ 4 \text{Au} + 8 \text{NaCN} + 2 \text{H}_2\text{O} \rightarrow 4 \text{Na[Au(CN)}_2] + 4 \text{NaOH} \]
- In this reaction, gold (Au) is oxidized to Au(I) or Au(III) depending on the conditions.

2. **Analyzing the Absence of Air/O₂:**
- In the absence of air or oxygen, the oxidation state of gold is not necessarily +3. Instead, it can remain in a lower oxidation state (like +1). Thus, the formation of a cyano complex of Au(III) is incorrect when there is no oxygen present.
- Therefore, **Statement I is false**.

3. **Understanding the Role of Zinc in Gold Extraction:**
- In the extraction process, after the gold is leached and forms a complex with cyanide, zinc is added to reduce the gold back to its metallic form:
\[ \text{Na[Au(CN)}_2] + \text{Zn} \rightarrow \text{Au} + \text{Zn(CN)}_2 + \text{Na} \]
- In this reaction, zinc (Zn) is oxidized from an oxidation state of 0 to +2, while gold is reduced from Au(I) or Au(III) back to Au(0).
- Therefore, **Statement II is true**.

4. **Conclusion:**
- Since Statement I is false and Statement II is true, the correct answer is that Statement I is incorrect, and Statement II is correct.

### Final Answer:
- **Statement I is false; Statement II is true.**