Although aluminium is above hydrogen in the electrochemical series, it is stable in air and water Why?

Although aluminium is above hydrogen in the electrochemical series, it

1.	Although aluminium is above hydrogen in the electrochemical series, it is stable in air and water Why?
Answer» <html><body><p></p>Solution :The <a href="https://interviewquestions.tuteehub.com/tag/thin-707663" style="font-weight:bold;" target="_blank" title="Click to know more about THIN">THIN</a> protective film of oxide, `Al_2O_3` is <a href="https://interviewquestions.tuteehub.com/tag/formed-464209" style="font-weight:bold;" target="_blank" title="Click to know more about FORMED">FORMED</a> on the surface of aluminium. <br/> This <a href="https://interviewquestions.tuteehub.com/tag/protects-1170792" style="font-weight:bold;" target="_blank" title="Click to know more about PROTECTS">PROTECTS</a> the metal from further <a href="https://interviewquestions.tuteehub.com/tag/attack-887517" style="font-weight:bold;" target="_blank" title="Click to know more about ATTACK">ATTACK</a> of air and water. Thus the metal is stable in air and water.</body></html>