When an aluminum strip is kept immersed in freshly prepared ferrous sulfate solution taken in a test tube, the change which is observed is _______.

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a colorless gas with the smell of burning sulfur is observed

the lower end of the test tube becomes slightly warm

light green solution changes to blue

light green solution slowly turns colorless

answer is D.

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Detailed Solution

Iron will be removed from the ferrous sulfate solution because aluminum is more reactive than iron and placed above iron in the reactivity series.
As iron is removed from iron sulfate, aluminum forms blue-colored aluminum sulfate when an aluminum strip is kept submerged in freshly made light green ferrous sulfate solution.
The solution's light green hue turns blue.
The chemical reaction between ferrous sulphate and aluminium is represented as:
$3 {FeSO}_{4} + 2 Al \to {Al}_{2} {({SO}_{4})}_{3} + 3 Fe$

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