Question

species,
69
TO
Problem 8.4
Justify that the reaction:
2Cu,O(s) + Cu S(s) + 6Cu(s) + SO2(g)
is a redox reaction. Identify the species
oxidised/ reduced, which acts as an
oxidant and which acts as a reductant.
Solution​

Answer 1

Answer:ANSWER

Writing the oxidation number of each atom above its symbol we have,

2  

Cu  

2

​  

 

+1

​  

 

O(s)

−2

​  

+  

Cu  

2

​  

 

+1

​  

 

S

−2

→6  

Cu

O

(s)+  

S

+4

 

O  

2

​  

 

−2

​  

(g)

Here, in the reaction, the oxidation number of copper decreases from +1 in Cu  

2

​  

O or Cu  

2

​  

S to 0 in copper metal, therefore, copper is reduced and is. oxidizing agent or oxidants.  

Further, the oxidation number of S increases from −2 in Cu  

2

​  

S to +4 in SO  

2

​  

. Therefore, Sulphur is oxidized. Thus, it is reducing agent of reductant.