Question

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Answer 1

Answer:

"We will observe a shift of colour from blue to green when immersing iron nails in the CuSO4 solution and a brown deposit will be observed on the iron nails."

So your answer will be (D).

Hope it may help you

Answer 2

Explanation:

$\sf \underline \green{4) The \: colour \: of \: solution \: changes \: to \: green \: }$

We will observe a shift of colour from blue to green when immersing iron nails in the CuSO4 solution and a brown deposit will be observed on the iron nails.

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$\sf \pink{CuSO4 + Fe} → \green {FeSO4 + Cu}$

$\bf\underline\blue{Hopє \: this \: hєlps \: you !}$

$\\ {\underline{\rule{300pt}{9pt}}}$