Which amongst the following observations cannot be made when an iron nail is dipped in copper sulphate solution for a long time?

Iron nail acquires a brown layer

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The solution turns green

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Iron sulphate is formed

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Iron nail vanishes

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Solution

The correct option is D Iron nail vanishes
Iron nail when dipped in blue coloured copper sulphate solution acquires a brown layer due to the formation of copper. During this, iron sulphate is also formed, which turns the copper sulphate solution green, as shown below.

$F e (s) + C u S O_{4} (a q) \to C u (s) + F e S O_{4} (a q)$

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