Question

A student performed following two activities in school laboratory.
Activity 1: Addition of zinc dust into copper sulphate solution taken in a test tube.
Activity 2: Addition of an iron nail into copper sulphate solution taken in a test tube.
He noted down his observation and concluded that chemical reaction occurs in both the
cases based on the observed colour change of the resulting solution.
a) What was the initial colour of the solution?
b) What is the final colour of the solution in Activity 1?
c) What is the final colour of the solution in Activity 2?
d) What are the products formed in Activity 2?
e) Based on these activities, what can you conclude about the reactivity of elements
zinc and iron as compared to that of copper?
​

Answer 1

Explanation:

a) the initial colour of the solution was blue.

b) the final colour of the solution in Activity 1 is

colourless

c) the final colour of the solution in Activity 2 is green

d) the products formed in Activity 2 are ferrous sulphate solution and copper metal

e) zinc and iron are more reactive than copper