State the reason for the following :
An iron strip dipped in a blue copper sulphate solution turns the blue solution pale green.

Explanation

To understand why an iron strip dipped in a blue copper sulfate solution turns the blue solution pale green, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Initial Observation**: When an iron strip is dipped into a blue copper sulfate (CuSO₄) solution, the solution changes color from blue to pale green.

2. **Understanding Reactivity**: To explain this color change, we need to refer to the reactivity series of metals. The reactivity series ranks metals based on their ability to displace other metals from their compounds.

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