What is the correct answer about oxide coating?

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i'm guessing the answer is d). I am really not sure about that though... Can someone explain to me what the correct answer is suppose to be and why? Thanks.
 

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I'm guessing the aluminum, iron oxide is quite porous.
 
apchem, these are multiple choice questions, and it doesn't take more than a little Googling to find the correct answer - at least in this case.
 
Gokul43201 said:
apchem, these are multiple choice questions, and it doesn't take more than a little Googling to find the correct answer - at least in this case.

I suppose i'll try that later... but still lots of stuff to go through for now...
 
GCT said:
I'm guessing the aluminum, iron oxide is quite porous.

Thanks for answering
 

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