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प्रश्न
What is rust ?
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उत्तर १
Rust: Rust is hydrated ferric oxide (Fe2O3 . x* H2O), which forms a brownish red coating over iron. (* x can be any number.)
उत्तर २
The hydrated oxide of iron formed when iron comes in contact with moist air is called rust. This rust is brownish flaky residue and easily crumbles from the metal surface.
4Fe + 3O2 → 2Fe2O3
Iron Oxygen Ferric oxide
संबंधित प्रश्न
Fill in the blank by choosing the correct word from the given list.
List: oxygen, carbonic, suIphur dioxide gas, precipitation, helium
____________ gas can cause acid rain.
How will you prove that oxide formed by burning sodium is basic in nature?
State two most important conditions for rusting.
State four ways of preventing rusting.
State how nitrogen is utilised by plants for their growth. Give a reason why nitrogen is used in flushing food packages.
Describe simple experiments to show the presence of -
oxygen and nitrogen component in air using a bell jar
Describe simple experiments to show the presence of -
carbon dioxide in air using a test tube with outlets containing lime water.
In the laboratory preparation of oxygen from hydrogen peroxide answer the following:
State the method of collection of the oxygen gas giving reasons.
A process without emitting flame is called as ______.
Match the following
| 1. | Burning of meteors | a. | Exosphere |
| 2. | Weather change | b. | Stratosphere |
| 3. | Lowest temperature | c. | Mesosphere |
| 4. | Ozone layer | d. | Troposphere |
