Question

why does the iron nail become brownish colour and the blue colour copper sulphate solution fades??​

Answer 1

Answer:

The iron nail become brownish in colour and the blue colour of copper sulphate solution fade because when an iron nail dipped in the copper sulphate solution then iron displaces copper from the copper sulphate because iron is more reactive than copper therefore the colour of copper sulphate solution changes.

Explanation:

Answer 2

Answer:

Iron displaces Copper from it's solution and hence, the Blue-coloured Copper Sulphate solution turns to greenish Ferrous Sulphate and the copper displaced gets deposited on the iron nail. So, the iron nail turns reddish-brown due to deposit of copper on it.

Explanation:

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