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प्रश्न
Name the acid that renders aluminum passive. Why?
उत्तर
Dilute or concentrated nitric acid (HNO3) renders aluminium passive. Because nitric acid does not attack aluminium but it renders aluminium passive due to the formation of an oxide film on its surface.
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संबंधित प्रश्न
In the aluminothermic process, the role of Al is _____.
Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.
Metal A belongs to period 3 and group 13. A in red hot condition reacts with steam to form B. A with strong alkali forms C. Find A, B, and C with reactions.
Match the following Column A with Column B.
| Column A | Column B | ||
| (a) | Aluminium | 1. | Covalent compound |
| (b) | Sulphuric acid | 2. | Carbonate ore |
| (c) | Calcination | 3. | Hall Heroult’s process |
| (d) | Calcium Chloride | 4. | Contact Process |
| (e) | Carbon tetrachloride | 5. | Electrovalent compound |
State the reasons if:
Zinc and aluminium can be distinguished by heating the metal powder with a concentrated sodium hydroxide solution.
