When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change which is observed is:
(1) light green solution slowly turns colourless
(2) the lower end of the test tube becomes slightly warm
(3) a colourless gas with smell of burning sulphur is observed
(4) light green solution changes to blue

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Solution

Aluminium is more reactive than iron hence will displace iron from the solution, so when an aluminium strip is kept immersed in freshly prepared light green colored ferrous sulphate solution, aluminium displaces iron from iron sulphate and forms blue colored aluminium sulphate.
$2 Al (s) + 3 {FeSO}_{4} (aq) \to {Al}_{2} ({SO}_{4})_{3} (aq) + 3 Fe (s)$

Hence, the correct answer is option 4.

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