When copper turnings are added to silver nitrate solution, a blue coloured solution is formed after sometime. It is because, copper

Options

A. oxidises silver from the solution
B. forms a blue coloured complex with `AgNO_(3)`
C. is oxidised to `Cu^(2+)`
D. is reduced to `Cu^(2+)`.

Explanation

### Step-by-Step Solution:

1. **Understanding the Reaction**: When copper turnings are added to silver nitrate solution, a chemical reaction occurs. We need to identify the reactants and products involved in this reaction.

2. **Writing the Chemical Equation**: The reaction can be represented as:
\[ \text{Cu (s)} + 2 \text{AgNO}_3 (aq) \rightarrow \text{Cu(NO}_3\text{)}_2 (aq) + 2 \text{Ag (s)} \]
Here, copper (Cu) reacts with silver nitrate (AgNO₃) to form copper(II) nitrate (Cu(NO₃)₂) and silver (Ag).

3. **Identifying Oxidation States**:
- In the reactants, copper (Cu) is in its elemental form with an oxidation state of 0.
- In the product, copper is in the form of copper(II) nitrate (Cu(NO₃)₂), where copper has an oxidation state of +2.
- For silver (Ag), it starts with an oxidation state of +1 in silver nitrate and ends up as elemental silver (Ag) with an oxidation state of 0.

4. **Determining Oxidation and Reduction**:
- **Oxidation**: The process where an element loses electrons. Here, copper goes from 0 to +2, meaning it loses 2 electrons. Therefore, copper is oxidized.
- **Reduction**: The process where an element gains electrons. Silver goes from +1 to 0, meaning it gains 1 electron. Therefore, silver is reduced.

5. **Conclusion**: The blue-colored solution is formed due to the presence of copper ions (Cu²⁺) in the solution after the reaction. The formation of this blue solution indicates that copper has been oxidized to Cu²⁺.

### Final Answer:
Copper is oxidized to Cu²⁺ when it reacts with silver nitrate solution, resulting in the formation of a blue-colored solution.

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