Question

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.
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Answer 1

Colour Chang will be as follows

1)In test tube A it will change from green to colourlesss.

2)In test tube B it will be from blue to colourlesss.

3)In test tube D it will be from blue to green.

Aluminium is most reactive metal here.

Hope it helps you.

Answer 2

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.