Question

What will be the change in colour if copper sulphate solution when magnesium is added?

Answer 1

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Blue colour of copper sulphate solution discharges as MgSO4 is formed and Cu gets precipitated.
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Answer 2

When magnesium is placed in copper sulfate solution a redox reaction occurs, causing copper metal to form on the magnesium and the deep blue colour of the solution pales.

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