A)
1 2 3 4 Colour- less Green Blue Colour-less
B)
1 2 3 4 Light green Green Blue Pale yellow
C)
1 2 3 4 light blue Colour - less Colour - less Light blue
D)
1 2 3 4 Colour - less Colour - less Colour - less Colour - less
Correct Answer: D
Solution :
As per the reactivity series, reactivity of metals is Al > Zn > Fe > Cu. As Zn, Fe and Cu, all are less reactive than Al so, they do not displace Al from \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\]solution hence, all the solutions remain colorless. There is no effect observed in test tube 4 as Al is dipped in its own salt solution.
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