(2)

In the reactivity series, aluminium is above zinc, iron and copper, which makes it more reactive than these elements. Mrignayni would observe that out of the four solutions, reaction will take place in solution B, C and D. The reactions are as follows:

In Solution B: Aluminium will displace iron from ferrous sulphate solution to form aluminium sulphate and iron is precipitated.

$2FeS{O}_4 \left(aq\right) + 2Al \left(s\right) \to A{l}_2{\left(S{O}_4\right)}_3 \left(aq\right) + 3Fe \left(s\right)$

In Solution C: Aluminium will displace zinc from zinc sulphate solution to form aluminium sulphate and zinc is precipitated.

$2Al \left(s\right) + 3ZnSO₄ \left(aq\right) \to Al₂(SO₄)₃ \left(aq\right) + 3Zn \left(s\right)$

In Solution D: Aluminium will displace copper from copper sulphate solution to form aluminium sulphate and copper is precipitated.

$2Al \left(s\right) + 3CuSO₄ \left(aq\right) \to Al₂(SO₄)₃ \left(aq\right) + 3Cu \left(s\right)$

(3)

Steel is an alloy which contains iron as a metal and carbon as a non-metal.

(2)

The elements or compounds which occur naturally in the earth crust are known as minerals. The mineral from which an element can be extracted easily and profitably is called an ore. The impurities or unwanted substances present in ore such as sand, rock etc. is known as gangue.