Question

`Zn` acts as sacrifical or cathodic protect iont to prevent rusting of iron because
A. `E_(OP)^(@)` of `Zn lt E_(OP)^(@)` of Fe
B. `E_(OP)^(@) ` of ` Zn gt E_(OP)^(@)` of Fe
C. `E_(OP)^(@) ` of `Z n =E_(OP)^(@)` of Fe
D. Zn is cheaper than iron

Answer 1

Correct Answer - B
Zn is oxidised in place of iron and iron acts as cathode if Zn plating or galvanisation of iron is made and thus called cathodic protection . Since Zn is oxidised and thus also called sacrifical protection .