A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions

CBSE Class 10 CBSE Class 10 Science
1

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.

2

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The colour charge in test tube (green) that is from blue to light green.
Aluminium is more reactive than iron because aluminium reacts with oxygen in air to form a larger of oxide which protects the aluminium from further oxidation. Therefore, Aluminium does not carrode as much as iron.