state the observation on action of conc. nitric acid on copper
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Cu + 4HNO3 ----> Cu(NO3)2 + 2H2O + 2NO2
》 When metals like Iron, Aluminium, Copper become passive ( inert ) when reacted with pure concentrated nitric acid.
》It is due to the formation of extremely thin layer of insoluble metallic oxide ( passivity ) which stops the reaction.
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