From the following select the one which is not an example of corrosion.
- Rusting of iron object
- Production of hydrogen by electrolysis of water
- Tarnishing of silver
- Development of green coating on copper and bronze ornaments
The Correct Option is B
Solution and Explanation
Corrosion is the deterioration of a material due to a chemical reaction with its environment.
- Rusting of iron is a corrosion process (oxidation of iron).
- Tarnishing of silver is a type of corrosion (formation of silver sulfide).
- Development of a green coating (patina) on copper and bronze is a form of corrosion (formation of copper carbonate and other compounds).
- Production of hydrogen by electrolysis of water is not a corrosion process. It's an electrochemical process where water is decomposed into hydrogen and oxygen.
Therefore, the process which is not an example of corrosion is the production of hydrogen by electrolysis of water.
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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