A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change ? On the basis of this experiment, state which one is the most reactive metal and why.
Answers
Aluminum is the most reactive of all as it's on the top of the reactivity series from other elements.
1) A = Pale green color of FeSO4 solution will fade away.(As Al displace it)
B = Blue color of CuSO4 will fade away.(As Al displace it)
2) A = No reaction as Iron can't displace Al.
B = Blue color of CuSO4 will fade away Pale green color will appear.(As Fe displace it)
Answer:
She will observe color changes in test tubes A and B as aluminum displaces iron and copper from their respective salt solution.
A color change will also be observed in test tube D as iron displaces copper but does not displace aluminum.
No colour will take place in C as Fe cannot displace Al from Al2(SO4)3 .
From the above observations we can conclude that aluminum is the most reactive metal.
Hope it helps
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