Question

The flow of electron in certain galvanic cells are given below: 

i. Cu → Ag 

ii.  Ag → Zn 

iii. Na → Mg 

iv. Fe → K 

a. Choose the incorrect ones. 

b. Explain your answer.

Answer 1

a. ii. Ag → Zn, 

iv. Fe → K are the incorrect ones. 

b. Zn has a higher reactivity than Ag. Hence Zn undergoes oxidation (loses electrons). So the direction of electron flow is from Zn to Ag. Similarly, K has higher reactivity than Fe.

Hence direction of electron flow is from K → Fe.