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प्रश्न
Give a reason why rust turns moist red litmus blue.
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उत्तर
A suspension of rust is basic in nature and hence turn moist red litmus blue.
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संबंधित प्रश्न
The chemical reaction involved in the corrosion of iron metal is that of:
(a) oxidation as well as displacement
(b) reduction as well as combination
(c) oxidation as well as combination
(d) reduction as well as displacement
In one method of rust prevention, the iron is not coated with anything. Which is this method?
Name two metals which resist corrosion due to the formation of a thin, hard and impervious layer of oxide on their surface.
Explain with reason:
Roasting is carried out on sulphide ores and not on carbonate ores.
Explain the term – rusting and give a word equation for the formation of rust. If polished iron nails are kept in three separate test tubes, state the contents in each test tube required, to prove the conditions for rusting.
Write scientific reason.
On exposure to air, silver articles turn blackish after some time.
Observe the following diagram and give answers.
- Name this method of prevention of corrosion.
- For prevention of which metal this method is used?
- What is used as anode in this method?
Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ____________.
State whether the following statement is true or false:
Ships suffer a lot of damage though they are painted.
Explain the chemical reactions in rusting of iron.
