Advertisements
Advertisements
प्रश्न
Give a reason why rust turns moist red litmus blue.
Advertisements
उत्तर
A suspension of rust is basic in nature and hence turn moist red litmus blue.
APPEARS IN
संबंधित प्रश्न
Write two methods of preventing the rusting of iron.
Which of the following methods is suitable for preventing an iron frying pan from rusting?
Name five methods of preventing rusting of iron.
Name the metal which is a constituent of plant pigment?
What is "rusting"? Describe with a labelled diagram an activity to investigate the conditions under which iron rusts.
_______ forms a green colour in the water.
Alloys are homogeneous mixtures of a metal with a metal or nonmetal. Which among the following alloys contain non-metal as one of its constituents?
Give an example of a chemical reaction for the following situation:
Sound is produced
| 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.
Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?
