Al reacts with dil.HNO3 but not with con. HNO3. Why?

1.	Al reacts with dil.HNO3 but not with con. HNO3. Why?
Answer» => HNO3 is strong OXIDISING agent. => O2 makes a oxygen layer on ALUMINIUM surface in air. => So, Al does not react with conc. HNO3 in air. => But in DILUTE medium HNO3 reacts with Al because O2 seperate from surface..

Answer»

=> HNO3 is strong OXIDISING agent.

=> O2 makes a oxygen layer on ALUMINIUM surface in air.

=> So, Al does not react with conc. HNO3 in air.

=> But in DILUTE medium HNO3 reacts with Al because O2 seperate from surface..

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