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Which of the following methods is suitab...

Which of the following methods is suitable for preventing an iron article from rusting ?
Applying grease
Applying paint
Coating Zinc
keep the article in water

A

a,b

B

b,c

C

a,c

D

a,b,c

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Knowledge Check

  • Which of the following metals acts as a sacrificial anode for iron articles ?

    A
    Cu
    B
    Zn
    C
    Ag
    D
    Sn

  • Which of the following is most suitable method for removing the traces of water from ethanol ?

    A
    Heating with Na metal
    B
    `Passing dry HCl through it
    C
    Distilling it with CaO
    D
    Reacting with Mg

  • Which method is suitable to separate salt from sea water?

    A
    sublimation
    B
    evaporation
    C
    chromatography
    D
    distillation

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    The process ofcorrosion ofiron is known as rusting. Rust appears to be a hydrated ferricoxide Fe_2O_3, xH_2O, Both O_2 & H_2O are required for rusting. Iron can be protected from the rusting by use of following compounds. i) Applying paints, lacquers and enamells on the surface ofiron ii) By forming a firm and coherent protective coating of ferroroferric oxide. This is done by passing steam over hot iron iii) By coating a thin film of Zinc, Tin, Nickel, chromium, aluminium etc, on the surface of iron If plated with Zinc, the reaction of products of Zinc with O_2 and H_2O form a coating which sticks to the surface and there by protects iron Zinc protects iron from corrosion because

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