Iron filings were added to a solution of copper sulphate .After 10 minutes , it was observed that the blue colour of the solution changed and a layer got deposited on iron filings .The colour of the solution and that of the layer would respectively be

Options

A. yellow and green
B. brown and blue
C. red and greenish blue
D. green and reddish brown .

Explanation

To solve the question regarding the reaction between iron filings and copper sulfate solution, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this case are iron filings (Fe) and copper sulfate (CuSO₄). Copper sulfate is known for its blue color.

2. **Understand the Reaction**:
- When iron filings are added to the copper sulfate solution, a chemical reaction occurs. Iron displaces copper from copper sulfate because iron is more reactive than copper.

3. **Write the Chemical Equation**:
- The reaction can be represented by the following equation:
\[ \text{Fe} + \text{CuSO}_4 \rightarrow \text{FeSO}_4 + \text{Cu} \]
- Here, iron (Fe) reacts with copper sulfate (CuSO₄) to produce ferrous sulfate (FeSO₄) and copper (Cu).

4. **Determine the Products**:
- The products of the reaction are ferrous sulfate (FeSO₄) and copper (Cu).
- Ferrous sulfate is typically green in color, while copper appears as a reddish-brown solid.

5. **Observe the Changes**:
- Initially, the solution is blue due to the presence of copper sulfate.
- After the reaction, the solution changes color due to the formation of ferrous sulfate, which is green.
- Additionally, a reddish-brown layer of copper is deposited on the iron filings.

6. **Conclude the Colors**:
- Therefore, after 10 minutes, the color of the solution changes from blue to green, and the color of the deposited layer (copper) is reddish-brown.

### Final Answer:
- The color of the solution changes to **green**, and the color of the layer deposited on the iron filings is **reddish-brown**.