Iron sheets are cleaned with hydrochloric acid before dipping into molten zinc for galvanizing. Why?

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Solution

When iron sheets are washed with HCl, It reacts with the various impurities such as,

Fe2O3+4HCl→ FeCl2+H2O+O2

Fe(OH)2+2HCl→FeCl2+2H2O

If they were not removed, the would probably compromise the Zinc protection as they would react with the zinc from the inside and damage the zinc protection.

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Similar questions

Give reasons for the following:

a) Iron is used to construct bridges and houses.

b) Iron sheets are galvanized before use.

Explain why, iron sheets are coated with zinc.

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