Home
Class 12
CHEMISTRY
Zine can be coated on iron to produce ga...

Zine can be coated on iron to produce galvanized iron but the reverse is not possible it is because

A

zinc is lighter than iron

B

zinc has lower melting point than iron

C

zinc has lower negative electrode potential than iron

D

zinc has higher negative electrode potential than iron.

Text Solution

Verified by Experts

The correct Answer is:
D
(d) The metal with higher negative standard reduction potential, have higher tendency to get reduced.
`Zn^(2+)+2e^(-) to Zn,E^(@)=-0.76V`
`Fe^(2+)+2e^(-) to Fe, E^(@)=-0.44V`
Here, in galvanised iron, Zn has higher negative reduction potential means Zn takes electrons given by iron and itself gets reduced.
Thus, Zn works as anode and protects iron from rusting by making iron as cathode.
Promotional Banner

Similar Questions

Explore conceptually related problems

Galvanized iron sheets are coated with

A iron needle slowly placed on the surface of water floats on it because

Iron does not rust even if zinc coating on its surface is broken but the same is not true when coating is of tin.

Car tyres are made of rubber and not of iron because

A frog can be levitated in a strong magnetic field below it . This is possible because the body of the frog behaves as

Food cans are coated with tin and not with zinc because

Iron can be prevented from rusting by

The reaction of iron with steam is reversible. (T/F)

E^@ values of three metals are listed below. {:(Zn_((aq))^(2+) + 2e^(-) to Zn_((s)),, E^@=-0.76V),(Fe_((aq))^(2+) + 2e^(-) to 2Fe(s) , , E^@=-0.44 V),(Sn_((aq))^(2+)+2e^(-) to Sn_((s)) ,, E^@=-0.14 V) :} Which of the following statements are correct on the basis of the above information ? (i)Zinc will be corroded in preference to iron if zinc coating is broken on the surface. (ii)If iron is coated with tin and the coating is broken on the surface then iron will be corroded . (iii)Zinc is more reactive than iron but tin is less reactive then iron.

A frog can be levitated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as