The spot at which corrosion occurs on the surface of an iron material, behaves as
- cathode
- anode
- either cathode or anode
- It has no relation with electrode
The Correct Option is B
Solution and Explanation
Correct answer: anode
Explanation:
In the process of corrosion of iron (like rusting), the spot where iron corrodes acts as the anode. At the anode, iron loses electrons and gets oxidized to form iron ions:
\( \text{Fe} \rightarrow \text{Fe}^{2+} + 2e^- \)
These electrons travel to another spot (the cathode), where they reduce oxygen in the presence of water. Thus, the corroding spot is the anode.
Top Questions on Corrosion
A force of \( P = 100 \, {N} \) is applied at the ends of the pliers as shown in the figure. Neglecting friction, the force exerted by the upper jaw on the workpiece is ........... N (in integer).
- For a certain linear elastic isotropic material, the Young’s modulus is 140 GPa and the shear modulus is 50 GPa. The Poisson’s ratio for the material is ........... (rounded off to two decimal places).
Consider a beam with a square box cross-section as shown in the figure. The outer square has a length of 10 mm. The thickness of the section is 1 mm. The area moment of inertia about the x-axis is ........... mm\(^4\) (in integer).
- Using \( E^\circ \) values of X and Y given below, predict which is better for coating the surface of iron to prevent corrosion and why?
Given:
\( E^\circ_{X^{2+}/X} = -2.36 \, \text{V} \)
\( E^\circ_{Y^{2+}/Y} = -0.14 \, \text{V} \)
\( E^\circ_{Fe^{2+}/Fe} = -0.44 \, \text{V} \) - (i) Explain Corrosion. Write its two examples.
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