Question

The metal sample in the above experiment is: А. lead B. aluminium C. gold D. silver​

Answer 1

Answer:

b

Explanation:

The reactions that will take place in the test tubes are as follows:

Test tube A: 2 Al + 3FeSO4 → Al2(SO4)3 + 3Fe

Test tube B: 2 Al + 3CuSO4 →

Al2(SO4)3 + 3Cu Test tube C: 2Fe + Al2(SO4)3 → FeSO4 +

3 Al

Test tube D: 2Fe + CuSO4 → FeSO4 + Cu

Colour change is observed in test tube A,

test tube B and test tube D.

Aluminium is able to displace iron and copper ions from their respective solutions. Therefore, colour change is observed in test tubes A and B.

Iron cannot displace aluminium ions from its solution. Therefore, no colour change is observed in test tube C. Iron can, however, displace copper ions from its solution. Therefore, the colour change is observed in test tube D.

Since aluminium is able to displace both the metals and is also present higher in the reactivity series of metals, it is considered to be the most reactive metal out of all the given metals.

Answer 2

The metal sample in the above experiment is: B. aluminium

• Al2O3 is formed when aluminium combines with steam. Aluminium loses six electrons from its outermost shells, which are gained by oxygen molecules. The negative and positive charges attract each other because aluminium creates a positive charge and oxygen develops a negative charge.
• When Aluminium interacts with steam, it forms a thick layer of aluminium oxide that protects it from further reaction.