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Answers
Answer:
A and B
(a) is the correct answer
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QUESTION:
The rusting of iron can be prevented by coating it with a layer of
(a) zinc (b) Sodium. (c) chromium. (d) carbon
ANSWER:
(c) A and C ✔️
The rusting of iron can be prevented by coating it with a layer of zinc and chromium .
EXPLANATION:
Zinc:
Nearly one half of all zinc produced is used in zinc galvanizing processes to protect steel and iron from rusting. This involves coating the surface of a metal with a thin layer of zinc to create a corrosion-resistant barrier.
chromium :
Chromium changes the lattice constant of the iron to better match the spacing of the oxide layer. Chromium migrates to the surface, and with enough Cr a Cr-rich layer forms on the surface which in turn creates the passivation layer.
