Zinc acts as a sacrificial anode and corrodes in place of iron, protecting the iron from rusting. This process is known as galvanization, and it is an effective method to prevent corrosion (rusting) of iron. Applying grease can provide some protection, and applying paint can also be a barrier against moisture, but these methods may not be as durable or effective as the application of a zinc coating.
So, the correct option is (C): Applying a coating of zinc.
Match Column-I with Column-II and choose the correct option:
| Column-I (Minerals) | Column-II (Features) | ||
|---|---|---|---|
| A. | Copper | (i) | Used in manufacturing of steel and plants |
| B. | Bauxite | (ii) | Used in electric and electronic industries |
| C. | Mica | (iii) | Used in electric cables and utensils |
| D. | Manganese | (iv) | Used in aluminium production |
Choose the correct answer from the options given below:
Give reasons:
(i) The sky appears dark to passengers flying at very high altitudes.
At very high altitudes, passengers are above the atmosphere where there is less scattering of sunlight. As a result, they do not see the scattered blue light and the sky appears dark, similar to the condition experienced by astronauts in space.
(ii) 'Danger' signal lights are red in color.