Question

Zinc metal is added to aluminium sulphate solution; no reaction takes place because
A.Aluminium is more reactive than zinc
B.Aluminium and Zinc both are unreactive
C.Aluminium is less reactive than zinc
D.None of these.

Answer 1

If a piece of zinc metal is added to aluminium sulphate solution, no reaction will occur because Aluminium is above Zinc is the reactivity series and this Zinc can’t displace Aluminium from its aqueous Salt Solution.

Complete step by step answer:
The reactivity series is a list of the metal elements, arranged in order of their reactivity, with the most reactive at the top and the least reactive at the bottom. The following reactivity series is simplified to include only the most important metals:

MOST REACTIVE	Potassium(K)
Sodium(Na)
Calcium(Ca)
Magnesium(Mg)
Aluminium(Al)
Zinc Zn
Carbon C
Iron Fe
Lead Pb
Hydrogen H
Copper Cu
Silver Ag
LEAST REACTIVE	Gold Au

In the reactivity series, we can see that Aluminium is above Zinc. Therefore, Aluminium is more reactive than Zinc.
Thus, when the aqueous solution of Aluminium reacts with Zinc, Aluminium does not get displaced by Zinc hence no reaction takes place.

Zinc + Aluminium sulphate 🡪 Aluminium Sulphate + Zinc
$Zn$ + ${Al_2(S{O_4})_3}(aq)$🡪 no reaction
Thus, Aluminium is more reactive than Zinc.

Therefore, the correct answer is option (A).

Note: No reaction takes place when any of the metals from zinc, iron, aluminium, and copper are placed in aqueous solution of ${Al_2(S{O_4})_3}$ because all these metals are below Aluminium in the reactivity series.