Question

(a) Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first :
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
(b) What happens when a rod of zinc metal is dipped into a solution of copper sulphate ? Give chemical equation of the reaction involved.

Lakhmir Singh Chemistry Class 10

Answer 1

A.sodium
Calcium
Magnesium
Zinc
Iron
Lead
Copper
B. Zinc being more reactive displace copper Frm it's sulphate solution
Zn + CuSO4 = ZnSO4 + Cu

Answer 2

Answer :

Part (a) : Order of chemical reactivity of the metals :

(1) Sodium   (Most reactive metal)

(2) Calcium

(3) Magnesium

(4) Zinc

(5) Iron

(6) Lead

(7) Copper   (Least reactive metal)

Part (b) :

When a rod of zinc metal is dipped into a solution of copper sulfate then zinc will displace the copper from the copper sulfate solution and will form zinc sulfate. As, zinc is more reactive metal than the copper metal. So, zinc will displace the copper metal easily.

The chemical equation of the reaction is,

$Zn(s)+CuSO_4(aq)\rightarrow ZnSO_4(aq)+Cu(s)$

The chemical reactivity series is also shown below.