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(i) Define corrosion . (ii) What is co...

(i) Define corrosion .
(ii) What is corrosion of iron called?
(iii) How will you recognise the corrosion of silver?
(iv) Why corrosion of iron is a serious problem ?

Text Solution

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(i) Corrosion is a process in which metals are deteriorated by action of air, moisture, chemicals, etc.
(ii) Corrosion of iron is called Rusting.
(iii) Silver turns black as it reacts with `H_(2)S` present in air and forms a layer of `Ag_(2)S`.
(iv) Corrosion of iron is a serious problem beause it leads to wastage of tonnes of iron every year and lot of money is spent to repair or replace it .
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a. Define corrosion. b. What is corrosion of iron called? c.Why corrosion of ironis a serious problem? d. How we can prevent corrosion of iron? e. How will you recognise the corrosion of silver? OR Why does silver turn blackish when exposed to air?

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Knowledge Check

  • Corrosion of iron can be prevented by

    A
    heating
    B
    melting
    C
    painting
    D
    galvanising

  • In which of the following will be corrosion of iron be most rapid ?

    A
    in pure water
    B
    in air and moisture
    C
    in air and saline water
    D
    in pure oxygen

  • In which of the following the corrosion of iron will be most rapid?

    A
    in pure water
    B
    In pure oxygen
    C
    In air and moisture
    D
    In air and saline water.

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    What is corrosion? Explain the electro- chemical theory of rusting of iron and write the reactions involved in the rusting of iron?

    What is corrosion? Mention a general method to prevent it.

    Name two metals which do not correct easily . Give an example in each of the following case to support that : (i) Corrosion of some metals is an advantage. (ii) Corrosion of a metal is a serious problem .

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