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प्रश्न
What is ‘rusting’?
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उत्तर
When iron is exposed to moist air for a long time, it acquires a coating of a brown flaky substance called rust. This process is known as rusting.
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संबंधित प्रश्न
Tinning : Tin : : Galvanizing : _________
Which of the following methods is suitable for preventing an iron frying pan from rusting?
Two methods by which rusting of iron can be prevented are ______ and ______.
Write a chemical equation to show the process of corrosion of iron.
In one method of rust prevention, the iron is not coated with anything. Which is this method?
Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.
Write the name.
An alloy of copper and tin-
Write the name.
Method used to prevent corrosion of copper.
Explain the following:
Bubbles are produced when acetic acid is added to a solution of sodium hydrogencarbonate.
| A process of forming a thick oxide of aluminium when aluminium is exposed to air. This coat makes it resistant to corrosion. Resistance can be improved by making a layer of oxide thinker. In this technique, the aluminium article is the anode, and the electrolyte is sulphuric acid. The anode reaction results in the formation of a black-coloured film of aluminium oxide on the anode. By putting appropriate dyes in the electrolytic solution, both coloured surface with the decorative finish is achieved. Kitchen articles like anodised such as pressure cookers, pans and frames of sliding windows are applications of this technique. |
- Name the anode and electrolyte used in this technique.
- How can we make aluminium articles made resistant to corrosion?
- Name the technique used to coat the aluminium articles.
