Question

why do iron filings acquire a brown colour when dropped in copper sulphate solution​

Answer 1

Answer:

The iron fillings becomes reddish-brown. This is because a layer of copper gets deposited over the surface of the iron nail. Iron is more reactive than copper, so, it displaces copper from the solution of copper sulphate and the colour of the solution slowly changes from blue to green due to formation of iron sulphate

Answer 2

Answer:

This is because of rusting. If you want explanation pls look below.

Explanation:

Due to the single displacement reaction, as iron is more reactive than copper, it displaces copper from copper sulfate solution and leads to the formation of ferrous sulfate and copper as the product.

Hope this helps u :)