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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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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

BEYOND PUBLICATION-PRINCIPLES OF METALLURGY-EXERCISE
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  2. Aluminium is used for making cooking utensils. Which of the following ...

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  3. Which of the following methods is suitable for preventing an iron arti...

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  4. The formula of carnalllite is

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  5. --------- group are called chalcogenes.

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  7. Blister copper is a

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  8. Which of the following is wrong about poling ?

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  9. When an Iron object is painted, the process of corrosion is reduced du...

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  10. More electropositive metals (more active metals ) are not prepared by ...

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  11. Which of the following is true about preparation of Iron by smelting p...

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  12. Two test tubes. 'A' and 'B' contains iron nails. In 'A' test tube iron...

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  13. Buried underground pipes are coupled with small magnesium foils. This ...

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  14. During the electrolysis of sodium chloride ----------- gas liberates a...

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  15. is used to convert sulphide ore into oxide ore.

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  16. The ore of mercury is

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  17. Low boiling metals are purified by-----method

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  18. Rusting of iron is due to……..

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  19. The substance added to remove the impurity is

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  20. The formula for slag is………….

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