Question

A student added few piece of iron metal to two test tube a and b contain of aluminium sulphate and copper sulphate ? in which test tube colour change occurs

Answer 1

there will be a change in colour because iron is more reactive than copper and it will displace copper to form ferrous sulphate on the other hand as aluminium is more reactive than iron no change will be observed

Answer 2

as per the reactivity series
li- lithium
k - potassium
ca- calcium
Na - sodium
mg - magnesium
Al - aluminium
Mn - manganese
zn - zinc
Cr - chromium
Fe - ferrous
cd- cadmium
co - cobalt
Ni - nickel
Sn - tin
pb - lead
H - hydrogen
cu - copper
Hg - mercury
Ag - silver
Au - gold
as we go down in this series reactivity will decrease since reactivity of iron is more than copper so it will replace copper by displacement rxn and form ferrous sulphate and colour will turn green on the other hand reactivity of aluminium is more than ferrous ( iron ) so it will not react hence colour will not change