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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Correct answer: (4) light green solution changes to blue
Explanation: Aluminium is more reactive than iron, so it displaces iron from its sulphate solution and forms a blue coloured aluminium sulphate solution.
The chemical equation for the reaction is given below:
$2Al(s)+3FeSO_4(aq)→Al_2(SO_4)_3(aq) + 3Fe(s)$
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