Question

Adding magnesium to blue copper sulphate solution the blue color fades as colorless magnesium sulphate is formed and brown bits of copper metal forms a precipitate why and folmulae

Answer 1

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In the electrochemical (or metal reactivity) series, magnesium is placed above copper, as it is more reactive than copper.
In displcement reactions, a metal with more reactivity displaces a metal with less reactivity from its salt.
The above reaction is a displacement reaction.
Magnesium salts are always colorless.

CuSO4 + Mg --> MgSO4 + Cu

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