Help in chemistry needed quickly!!!

[.I.Am.Me.]

How do we prevent the rust of iron griders in bridges??
Plz anwer me.
Thanx in advance

 

[AHMED -_-]

usually paint

but sacrifical protection could also be used

 

[.I.Am.Me.]

so if both answes were in paper 1 which one would i choose??

 

[AHMED -_-]

paint

 

[.I.Am.Me.]

thnk u so much for ur help

 

[AHMED -_-]

no prob

 

[shawkat]

by painting

 

[.I.Am.Me.]

i have another question:
why cant we use zinc to coat food cans???

 

[.I.Am.Me.]

plz i need quick answers :S

 

[karimehab]

what are the statements which you have to choose one of them?!

 

[blue rox]

thats sick

 

[Dean713]

Zinc is more reactive than tin and would react with the food molecules

 

[LoayTYS]

i have another question:
why cant we use zinc to coat food cans???

Zinc will react with the food and will poison it however tin is a relatively less metal and will not react with the food molecules