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