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प्रश्न
State whether the statement given below is true or false. If false write the correct statement.
Either oxygen or moisture is essential for rusting.
विकल्प
True
False
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उत्तर
True.
APPEARS IN
संबंधित प्रश्न
Write two methods of preventing the rusting of iron.
Name any three objects (or structures) which are gradually damaged by the corrosion of iron and steel.
The corrosion of copper produces a ______ coating of basic copper carbonate on its surface.
What is corrosion?
What are the special properties of stainless steel?
A metal X which is resistant to corrosion is produced by the electrolysis of its molten oxide whereas another metal Y which is also resistant to corrosion is produced by the reduction of its oxide with carbon. Metal X can be used in powder form in thermite welding whereas metal Y is used in making cathodes of ordinary dry cells.
- Name the metals X and Y.
- Which of the two metals is more reactive: X or Y?
- Name one ore or metal X. Also write its chemical formula.
- Name one ore of metal Y. Also write its chemical formula.
- Name one alloy of metal X and one alloy of metal Y.
Complete the process of iron rusting by filling the blanks. Suggest a way to prohibit the process.
The iron rust is formed due to........................... reaction. Different
regions on iron surface become anode and cathode.
Reaction on anode region :
`F_e(s) → Fe^(2+) (aq) +2e^-`
Reaction on anode region :
`O_2(g) + 4H^+(aq) +............................ → 2H_2 O (l) `
When Fe2+ ions migrate from anode region they react with ................... to form Fe3+ ions.
A reddish coloured hydrated oxide is formed from ............... ions. It is called rust.
`2Fe_(3+) (aq) + 4H_2O(l) → ................. + 6H_+(aq) `
A way to prevent rusting ..................................................................
Answer the following question:
What is corrosion? Do gold ornaments corrode? Justify.
Observe the following diagram and write answers.
- Name the method.
- Explain the method.
- Give two examples of this method.
Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?
